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mzl4n8
how do the cameras work that can see through clothing?
I recently found out that these cameras exist and I'm curious how that works. I understand how X Ray imaging works and how MRI works but I don't understand how you could see through clothing with a camera (and do they really show a naked body or just the shape of your body?). If someone could help explain it to me that would be awesome. Disclaimer: I'm not at all interested in buying one or making one. Just confused how it works.
Technology
explainlikeimfive
[ "gw18snr", "gw18tnw" ]
[ "The ones I've seen use infrared. The wavelength penetrates your clothes (which are uniformly dense) and hit your skin. Different areas of skin will reflect the wavelength differently so it's possible to get a rough image of what's below the clothing" ]
[ 8 ]
[ [], [] ]
[ "url" ]
[ "url" ]
5uas0x
How do people with houses next to eachother get power from two different companies? (even though they both use the same power line)
Engineering
explainlikeimfive
[ "ddsmex3", "ddsptm0" ]
[ "You don't get power from a specific company. They provide capacity to the network and you pay for that. You get exactly the same power as everyone else." ]
[ 24 ]
[ [], [] ]
[ "url" ]
[ "url" ]
gg0cq3
How do internet web series make money?
I watch web series for free on YouTube. One thing I've always wondered is how do they make money. When I say web series, I'm talking about shows that need in-person actors. For example there's this web series I watch which has six seasons. The episodes run about 10-20 mins and it's backed by a company. Why can't the company just put the series on their website, wouldn't they be likely to generate more money than if it was placed on YouTube. P.S. Hope this meets the regulations. Edit: Why would a company opt to put a series on the web as opposed to putting it on a streaming service or any other platform?
Other
explainlikeimfive
[ "fpwqmcd", "fpwsrj8", "fpwqiw1" ]
[ "> Why can't the company just put the series on their website, wouldn't they be likely to generate more more than if it was placed on YouTube. With the series on YouTube, they gain a few advantages. They don't have to pay for hosting, and they get cross advertising from YouTube search results and recommendations. Having it on their site costs for hosting, and doesn't help anyone discover their website." ]
[ 9 ]
[ [], [], [] ]
[ "url" ]
[ "url" ]
h8z77u
What happens when sperm fertilizes an egg? How does the meeting of 2 things create a person?
Biology
explainlikeimfive
[ "futpd2k" ]
[ "The egg and sperm each carry half of the genetic information needed to create a person. Basically it's an instruction which the cells follow to create a person. The egg and sperm \"merges\" and forms a cell. This cell then grows and when it is big enough it splits into two cells. These two cells grows and splits into four cells which in turn grow and split. This cycle is repeated over and over again to form the billions upon billions of cells in your body. All along these cells are following the instructions which are encoded within our DNA and genes which instruct what cells to form at what stage in the development of a human fetus etc." ]
[ 3 ]
[ [] ]
[ "url" ]
[ "url" ]
aoqy4u
Why are shower faucets so sensitive that as you turn it the slightest bit to the left or right it could either become the perfect temperature, Satan's summer house, or the same temperature as my ex's cold, dead heart?
Engineering
explainlikeimfive
[ "eg2xadx", "eg2x3sr" ]
[ "If it isn't the thermostatic type the pressure will tend to favour either the hot or cold side due to the expansion of the water as it is heated, you are basically trying to balance a thermal seesaw that always wants to fall to one side or the other." ]
[ 3 ]
[ [], [] ]
[ "url" ]
[ "url" ]
6k3rqw
How did our ancestors get by barefoot?
How did neanderthals and all those primitive ancestors hunt and evade predation without any shoes? We go berserk if we so much as step on a lego. How did they run about with small pebbles and rocks on the ground and in the grasslands?
Biology
explainlikeimfive
[ "djj3mmw", "djj3auq", "djjlvg1", "djj3k2w", "djj3aj7" ]
[ "If you have ever walked on bare sufaces long enough you would begin to form thicker skin on the souls. If you look at a lot of outdoors living people there feet are like god damn leather. Also rudimentary shoes have been found with early humans. We originated in hot areas, so frostbite wasn't too much of an issue." ]
[ 42 ]
[ [], [], [], [], [] ]
[ "url" ]
[ "url" ]
b5ix6d
What are epigenetics and how do they work.
Other
explainlikeimfive
[ "ejdt8b9", "eje40q3" ]
[ "Imagine you have a twin. You both go to a birthday party and at the party you get a red ribbon but your twin gets a blue one. Now you start to make friends with people who like red ribbons while your twin makes friends who like blue ribbons. Now based on your different groups of friends you start to receive different gifts. Maybe you receive a scarf while your twin gets mittens. You start to grow apart furt0her and you get your ear pierced while your twin gets her nose pierced. No imagine you both grow up and have a child. You give your child the ribbon, scarf, and anything else you received along the way. She even gets her ear pierced because you did. That's as simple as I can make it. Basically 2 strands of DNA can be genetically identical (you and your twin), but due to the environment and cellular machinery, can be modified (your friends giving you different gifts). This causes the DNA to be expressed differently (different piercings) based on these modifications. For example, DNA in a muscle cell is expressed much differently than DNA in a neuron. Finally, when the DNA is replicated, it passes off these modifications to the new strands of DNA (your child inherits your things)." ]
[ 7 ]
[ [], [] ]
[ "url" ]
[ "url" ]
668dzi
why is it that technology is so advanced and we still can't use water or other liquids to run cars?
Water running cars
Engineering
explainlikeimfive
[ "dgghapl" ]
[ "You need energy. Water doesn't have any extra energy just sitting there. You CAN use Hydrogen as a fuel, reacting it with Oxygen to make water releases energy. So if you have water, you need to split it into Hydrogen and Oxygen which, get this, *requires energy*. We can use say, a centralized power plant to provide electricity to split water into Hydrogen and Oxygen, then ship the Hydrogen in tanks to fueling stations, and use a Hydrogen fuel cell to power a vehicle. such vehicles have been in operation for over a decade. (google \"hydrogen fuel cell\"). It was technically possible years ago but a huge project to make Hydrogen fuel stations on every street corner and set up the whole interconnected system to switch to Hydrogen. The thing is, though, if we need to start with electicity, or another source of Hydrogen, you might as well just use electricity to power the car, and you can go and buy as consumer product electric car right now." ]
[ 7 ]
[ [] ]
[ "url" ]
[ "url" ]
5z6n53
Why do drugs such as marijuana and cocaine induce paranoia to some degree?
With all the effects of dopamine and serotonin, I'm wondering what is going on psychologically to cause the feeling of paranoia?
Biology
explainlikeimfive
[ "devxija", "devoalu", "dew5m1g", "devwjk9" ]
[ "Actually, marijuana is not a drug itself. Marijuana is a plant that harbors a range of chemicals we call cannabinoids. We have identified more than 85 different cannabinoids. Marijuana may either induce or alleviate anxiety. Your brain already has cannabinoid-like compounds that it uses all the time. When marijuana is ingested, new mixes of cannabinoids are introduced and they can bind to differing receptor cells. Long story short, the anxiety-response of the brain is based on the initial biochemical conditions of the brain: > Our naturally occurring cannabinoids, anandamide (AEA) and 2-arachidonoylglycerol (2-AG) have effects much like 9-tetrahydorcanabinol (THC). Cannabinoids may cause increased or decreased anxiety levels. Anyone who has experienced feeling \"paranoid\" while smoking marijuana has felt the effect of increased anxiety, while others report feeling \"mellow.\" These disparate effects are also produced by our naturally occurring cannabinoids. AEA and 2-AG have been called \"promiscuous\" molecules, as they bind to CB receptors, but also bind to other types of receptors; locking-on to different receptors leads to different effects. In general, CB receptors mediate the \"calming effect\" of THC-like molecules. In contrast, anxiety increases when cannabinoids bind to other receptors. One example is a receptor called TRPV1. When either THC or naturally occurring AEA/2-AG bind to TRPV1, anxiety symptoms increase. These different effects of cannabinoids on the brain have complicated the study of marijuana and are responsible for the different effects from one person to another. > It has also been shown that our internal cannabinoids have different effects in different parts of the brain. In some areas of the brain, such as the periaqueductal gray matter, stimulating CB receptors leads to increased anxiety and depression. With increased use of medical marijuana in California, the Centers of Disease Control (CDC) has tracked increased rates of suicide, up 9% between 2010 and 2012. While we can't say for certain that marijuana makes people suicidal, there is an association between marijuana use and suicide that has been seen in other studies. In the past few years, hospitals in California have seen an increase in people treated for cannabis-induced psychosis, where individuals may report hearing voices, among other psychotic symptoms. URL_0 All in all, these chemicals are actually very poorly understood. The US federal government's Schedule 1 status for marijuana has severely handicapped, if not outright stalled, medical research into marijuana for decades. As a marijuana user (Colorado, recreational), i would not recommend marijuana as a treatment for anxiety even though i have found it to be useful for my own anxiety." ]
[ 44 ]
[ [ "https://www.anxiety.org/effect-of-marijuana-on-anxiety" ], [], [], [] ]
[ "url" ]
[ "url" ]
ehh3xx
How does an MRI work?
Technology
explainlikeimfive
[ "fcjcbc2" ]
[ "The machine makes an energy field inside it. Within that field, the tiny building blocks that make up your body get \"excited\". These excited blocks realease the energy in a different form that is measured by detectors. The noises you hear are the machine changing the energy field and measuring how the blocks respond. It can take a while to take a picture cause it has to wait for the excited blocks to give off their energy and return to their normal state. MRIs are safer than xray or CT scans cause they don't put radiation in your body." ]
[ 5 ]
[ [] ]
[ "url" ]
[ "url" ]
l3oqq2
What is happening with GME stock, why do people believe it will keep going up?
Economics
explainlikeimfive
[ "gkh2fsx" ]
[ "People borrowed a lot shares to sell them because they thought game stop was going bankrupt. Now they have to give them back but there are not enough shares around for them to buy so they will have pay to higher and higher" ]
[ 3 ]
[ [] ]
[ "url" ]
[ "url" ]
m80y0k
Unbiased explanation of Critical Race Theory?
Most of the ones I found through the search were not ELI5 at all, like they didn't even make an attempt at explaining in a simple fashion. Some others were obviously biased.
Other
explainlikeimfive
[ "gresxyj", "grf2ifm" ]
[ "Critical Race Theory is the theory that most, if not all, aspects of modern society have racism baked in, which is why it’s been so hard to get rid of racism. For example, we tend to assume that our laws are written to be race-neutral, but critical race theorists point to the fact that people from different racial backgrounds can have wildly different outcomes while dealing with similar legal issues in the same legal system. The explanation, according to CRT, is that the laws and legal system are actually designed (consciously or not) to perpetuate racism. It’s important to note that CRT isn’t really one theory, but rather is a collection of different ideas that challenge a wide swath of intellectual and political traditions. The common thread is that they all agree that race is one of the important factors in creating and maintaining inequalities in society." ]
[ 515 ]
[ [], [] ]
[ "url" ]
[ "url" ]
hewhyp
Why does the government have so-called Classified documents with information hidden from the public? How do they decide when it will be declassified and available as public knowledge?
Other
explainlikeimfive
[ "fvtx3fp" ]
[ "These generally cover stuff they don't want other nations to know: - Where exactly are weapons stored - What are the plans in case someone attacks - How to build certain weapons (e.g. nukes) If these things were publicly available in your nation, another nation could just sent a tourist/spy to get them easily as well. And that would help them plan attacks, or know in what areas you're unlikely to get involved, so they can get away with doing stuff there. A lot of this information gets outdated within a decade or so, because things have changed. Then they can be declassified and often are required to be by law (It can also be very advantageous, because if the stuff is impressive enough then the other nations will think: Wow, if they had _that_ 10 years ago, how impressive must it be now). Now. This was the \"official\" version. Governments also do things they would prefer their own people didn't know about, because they might disapprove (e.g. [MKULTRA]( URL_1 )). In some nations the government is forbidden from classifying something _only_ because of that (e.g. [Executive Order 13526 Sec. 1.7 (a)]( URL_0 )), but since the stuff is classified, how would you know that they're sticking to it?" ]
[ 9 ]
[ [ "https://en.wikisource.org/wiki/Executive_Order_13526", "https://en.wikipedia.org/wiki/Project_MKUltra" ] ]
[ "url" ]
[ "url" ]
lag4iu
How do millitary coups work?
Other
explainlikeimfive
[ "glnrh09", "glnrdgi", "glo6asg" ]
[ "You might find the book \"Coup d'État: A Practical Handbook\" an interesting read. I read it some years ago when I wondered about this, very enlightening." ]
[ 5 ]
[ [], [], [] ]
[ "url" ]
[ "url" ]
8tcn30
Why can't some fractures fuse together and how long can a bone survive in a nonunion before amputation is the only option?
Biology
explainlikeimfive
[ "e16xkmr" ]
[ "The vitamin structures of the bone are what decides if the bone will fuse or not. A bone can survive in nonunion for almost a whole year before amputation is necessary, believe it or not. And I will note that there has been cases of patients growing metal knives out of their hands after improper fusing. Source: physician" ]
[ 22 ]
[ [] ]
[ "url" ]
[ "url" ]
hehaes
How Does Caffeine Increase Running Performance?
Hello, I have come across articles recently claiming that caffeine boosts runners performance during races, and acts as a bronchodilator. I play hockey, and I have found that while caffeine can increase aspects of my performance, endurance is not one of them. I find it harder to breathe after consuming caffeine before endurance training or playing hockey. What is causing me to have the opposite reaction to the endurance boost from caffeine?
Chemistry
explainlikeimfive
[ "fvro546" ]
[ "Former Track and Field athlete here, I'm not fluent in biology and only studied it for one class in college, but I will try to do my best. The biggest thing to understand is that most studies talk about caffeine from coffee and only coffee. Caffeine does two very specific things to boost running performance. 1) It sends the fatty acids in your body through the metabolism cycle faster. This means the fat stores that hold onto energy that is burned during long distance workouts/competition get used at a faster rate. However, it is not beneficial unless you had the magic caffeine to body weight ratio correct based on how much you ingested. 2) Caffeine is a stimulant to your nervous system. Most of the time it means it's easier to dial into your mental focus. Used properly this helps you keep your breathing, mechanical form, and possibly mental state in check (there is a reason why long distance running is considered a \"lonely\" sport). All three of these things working in harmony helps you run \"faster\". Although most studies will tell you it's at a 1%-2% performance increase. Sorry I'm not the highest level expert, and some of this may be incorrect. But this is what I remember from competing in college." ]
[ 3 ]
[ [] ]
[ "url" ]
[ "url" ]
6ck9xb
Why do thinner slices of a given food taste better than a thicker cut? (Apples, steak, etc)
Other
explainlikeimfive
[ "dhvbbhg" ]
[ "Two components: Taste, and smell. Thinner slices generally have a larger surface area (than thicker cuts of same quantity), and contributes more chemicals to exposure to taste-buds on the tongue. Secondly thinner cuts allow more particles to become airborne (I'm not sure if vaporise is the right word, but you should get the idea). These vapours reach the nose, and we know that smell contributes a fair portion to the perception of taste of food." ]
[ 7 ]
[ [] ]
[ "url" ]
[ "url" ]
c6xmsx
What is a connection between commodity price on an exchange and price of the actual commodity?
There is price of, say, grain futures on a commodity market, but, to my understanding, if I bought some of them, nobody is going to deliver 10 tons of grain to me when the futures expire and there is a delivery day. I would be just paid a current "market" price of the grain. It seems that price of a security is completely detached from the actual commodity price. What is a mechanism that prevents commodity market prices from running away from prices of actual grain on an actual elevator when you can neither ask for delivering of actual commodity from exchange nor can you deliver it yourself to the exchange? [This ELI5 question]( URL_0 ) touches the topic, but does not explain actual connection. Answers imply that actual delivery to the exchange happens, while in fact trades happen through brokers, and they seem to prohibit keeping securities up to delivery day.
Economics
explainlikeimfive
[ "esbqhdz" ]
[ "The current or \"spot\" price is the commodity price at the time. So, settling the exchange contract involves getting paid or paying in real dollars what the commodity price is on the exchange contract. Say you purchased a future contract for 1 cow to be delivered in 1 month and you paid $10 for it. One month later, cows are being sold (actual cows) for $15 a cow (this is the market price). To settle your contract, you will be given $15 which is what you can buy 1 cow for at that time. If you actually want to buy a cow and wanted protection against cow inflation, then what you have done is spent $10 a month ahead of time to guarantee that you'll have the money to buy a cow at the end of the month. The other side of the deal is someone who wanted to sell a cow a month from now but believed that there would be cow deflation, so they wanted to guarantee that they'd sell their cow for $10. Who gains and loses depends on whether cows inflate or deflate in that period :-)" ]
[ 6 ]
[ [] ]
[ "url" ]
[ "url" ]
7mgb93
how do large companies buy other large companies? Who gets the money? What happens to the employees? Is every company for sale?
Repost
explainlikeimfive
[ "drtpfxl" ]
[ "When a company is buying another company, what they're doing is purchasing the stock of that company. The money goes to whoever owned that stock. So if you owned 10 shares of ABC corp and XYZ corp acquired ABC corp you'd be paid for your 10 shares at a fair price, or alternatively your shares would convert into X shares of XYZ corp. Nothing happens to the employees just because of an acquisition. All it means is that a different set of people own the company. In some cases those people acquired the company because the company was profitable, so they'll not change much in the company because it's working. Other times they acquire the company because it has something valuable (patents, buildings, etc.) but it's otherwise not that useful, so they may fire many of the employees. Companies get acquired when people representing a majority (or more) ownership agree to it. The terms of the agreement decide what happens next. If you own 51% of a company and you refuse to sell for any price then your company is not for sale. The reality is most people get ownership of companies to make money, so there's probably some price that's worth selling. In some cases, very big companies can only reasonably be acquired by other very large companies, and in those cases the government might step in and prevent the sale, since it would be harmful for customers and others if it went through." ]
[ 3 ]
[ [] ]
[ "url" ]
[ "url" ]
7f4ii7
What exactly are the economic benefits behind Black Friday for companies and consumers?
Repost
explainlikeimfive
[ "dq9jmyq", "dq9fh8p", "dq9jnsa" ]
[ "They’re goal is to get you in the store with the promise of a $150 50 inch 4K tv ( which they only have about 7 of) so you can then spend money on other things at the store." ]
[ 5 ]
[ [], [], [] ]
[ "url" ]
[ "url" ]
8g3fnl
Why we feel unsafe after hearing about/watching creepy/scary/etc. things?
Biology
explainlikeimfive
[ "dy8s6if" ]
[ "It’s called a cognitive bias. Specifically, we’re talking about availability and affect heuristics. An availability heuristic means your brain more readily recalls data that you hear about frequently. For example, if the news media constantly talks about kidnappings you might assume that kidnappings are far more prevalent than they actually are. (Realistically, kidnappings are extremely rare and most are perpetrated by a parent.) An affect heuristic means your brain focuses on information that is dramatic and emotional. For example, even though kidnappings are very rare they are also utterly terrifying and life-shattering crimes. The severity and cruelty of the crime overrides the part of the brain that rationally evaluates the risk based on frequency. So these two things combine to make highly publicized and dramatic threats (like terrorism or shark attacks) seem like huge threats when - in fact - they are terrible but astonishingly rare. You are far more likely to die in a car crash, but because car crashes are mundane and receive little publicity, our brains de-prioritize them. So you get people who will support intrusive counterrorism measures and foreign wars while simultaneously texting on their phone when they drive. So this explains how the brain works but does not really explain why. The truth is that we just don’t know. An evolutionary psychologist might say that it has to do with making faster judgments. A caveman who encountered danger would be more likely to perish if he had to stop and rationally evaluate the threat. The ones who survived were the ones who used mental shortcuts to make faster judgments. All we can say for certain is that the brain is really, really bad at calculating risk vs. probablility (if we were good at it, there would be no such thing as casinos). So we use mental shortcuts to assume something we frequently hear about must frequently occur, and something we find unusual must be more dangerous than something we find mundane." ]
[ 12 ]
[ [] ]
[ "url" ]
[ "url" ]
9ap6ls
How does eating high fibre food prevent us from getting constipation?
Biology
explainlikeimfive
[ "e4x034r", "e4x1d0z", "e4xctku" ]
[ "You can't digest/break down fibre. It stays in your gut. When things stay in your gut, it tends to pull water in because the water can't be absorbed into your intestinal wall. That water acts to soften up your poop, making it pass along easier." ]
[ 29 ]
[ [], [], [] ]
[ "url" ]
[ "url" ]
bxf7do
why does alcohol burns like hell when we put it in a cut or bruise?
Biology
explainlikeimfive
[ "eq62jkt", "eq5yb1i" ]
[ "Alcohol makes your nerves respond in the same way they do to touching really hot things. (Binds to the same receptors, etc.)" ]
[ 13 ]
[ [], [] ]
[ "url" ]
[ "url" ]
8t9lm7
How can big swimming pools have underwater lamps without risking to electrocute people in the swimming pool?
Engineering
explainlikeimfive
[ "e15ra4d", "e15r92y", "e15rfal" ]
[ "The electricity doesn't go into the water to make light. It goes into a light source. The light source is then shielded from the water by thick glass so the electricity never reaches the water." ]
[ 6 ]
[ [], [], [] ]
[ "url" ]
[ "url" ]
76zq31
; Why is nautical speed measured in knots and not kph or mph?
Wouldn't it be simpler if everyone used either kph or mph?
Physics
explainlikeimfive
[ "dohv3o1", "dohv4l1" ]
[ "Knots are based on the size of the earth, so that one nautical is equal to one minute of latitude (and 1 knot is 1 nautical mile per hour). When you're talking about things like planes and seafaring boats, it makes sense to measure speed/distance based on a fixed property of the globe/maps." ]
[ 85 ]
[ [], [] ]
[ "url" ]
[ "url" ]
776q63
How does “cracking” a safe actually work? The kind where headphones are worn and every turn of the knob is carefully listened to.
Engineering
explainlikeimfive
[ "dojesav", "dok8ma6", "dojko1b" ]
[ "When you turn the knob of the safe, you can hear the mechanism \"tick\" when the wheels touch. This enables you to use the dial to measure how far you are turning each wheel. By putting torque on the opening handle, you can measure or hear (depending on the design) the gap in the wheel that allows the safe to open. The technique is specific to the design of the lock mechanism, and it can easily take hours. [This cool animation]( URL_0 ) shows how the mechanism works." ]
[ 10 ]
[ [ "https://www.youtube.com/watch?v=4RXc1J9SYCA" ], [ "http://4.bp.blogspot.com/_y_5OTMWVHYA/SnAHjVTM0lI/AAAAAAAAQM4/XWpLXV23Shg/s1600-h/DSC_0051.JPG", "https://imgur.com/a/ss3xl" ], [] ]
[ "url" ]
[ "url" ]
6ebyqv
When we eat spicy food, why does it cause pain in our mouths, no pain through the majority of our digestive systems, some minor discomfort once it reaches the last portion of our lower bowels, and then burn like a motherfucker once it hits our collective anuses?
Biology
explainlikeimfive
[ "di972eb", "di98gv7" ]
[ "Because we don't have heat receptors inside our bodies, but we do on our outsides and just inside our mouths and other soft areas since these areas benefit from being able to detect heat and abrasion, which is what those receptors detect and what spicy foods trigger." ]
[ 8 ]
[ [], [ "https://en.wikipedia.org/wiki/Capsaicin#Mechanism_of_action" ] ]
[ "url" ]
[ "url" ]
b3e6wp
where the fuck seedless fruits seeds came from??
Biology
explainlikeimfive
[ "eiyw301" ]
[ "There aren't any. Seedless fruit were genetically engineered, and then we just started cloning the plants. This is also done with other plants (all Fiji Apples are clones of *the* Fiji Apple) and has caused some problems. Until the 1950's, the entire planet ate Gros Michel bananas. Because they were genetically identical, they were all wiped out in a wave of banana disease, bringing that type of banana to extinction. Thing is, artificial banana flavoring was based on the Gros Michel banana, not the modern banana that replaced it, which is fly banana flavoring \"doesn't taste like bananas\"" ]
[ 3 ]
[ [] ]
[ "url" ]
[ "url" ]
7m2tpr
How do the bets in the middle of a craps table work?
Other
explainlikeimfive
[ "drqxc5d" ]
[ "There are two basic bets in the center: the hard way and proposition bets. The hard way bet is that the shooter will roll a certain combination of dice faces before rolling a 7 or any other combination. For example, the 5-5 hard way will win if 5-5 comes up, but will lose if 6-4 comes up or the shooter 7s out. Proposition bets are that the next roll will be whatever you bet on. So if you bet on 6-6, you will win if 6-6 comes up and lose to anything else. Same with any 7." ]
[ 6 ]
[ [] ]
[ "url" ]
[ "url" ]
hjpn8k
how high can a fly fly?
Biology
explainlikeimfive
[ "fwnvyb0", "fwofz4t", "fwnsxfd", "fwoccu5", "fwntojf", "fwooi02" ]
[ "Temperature usually determines max altitude. Flies can only fly if the temperature is about 50 degrees Fahrenheit (10°C) or warmer. If it’s 90 degrees at ground level (32.2°C), that’s a max height of about 6,000 feet (1829 meters). Other insects can go much higher. Some butterflies have been seen at 20,000 feet (6,096m), and a colony of bees was found on Everest at 18,400 (5,608m). Air chamber tests showed some of these bees can fly in extremely thin air, equivalent to 30,000 feet (9,144m). Going to that altitude outside an air chamber would be about -40 degrees Fahrenheit (-40°F equals -40°C, it's the one point where both scales intersect). Flies will typically be closer to the ground because that’s where the food is. edit: [Opening my inbox after not including metric conversions]( URL_0 )" ]
[ 1590 ]
[ [ "https://i.imgur.com/yCd6vC0.gifv" ], [], [], [], [], [] ]
[ "url" ]
[ "url" ]
83mu62
What exactly is metabolism?
Thin or scrawny people keep saying they have high metabolism and that’s why it’s harder for them to gain weight. Fitness channels on YouTube, say it’s not true since it’s because these guys aren’t eating enough and high metabolism means frequent intervals of hunger. Fat guys say that they very low metabolism. In the case of these people who have low metabolism, conversely do have frequent intervals of hunger. So I’m not sure if this makes any sense to me?
Biology
explainlikeimfive
[ "dvj002g", "dvj9ymo" ]
[ "Metabolism in this sense refers to how fast someone's body burns through any fuel it gets. Someone with a high metabolism needs food more often because the energy rafting that food gets used up more quickly. These people tend to be warmer and feel hotter. Even when a person with a high metabolism eats more, they might not gain as much weight as expected because their body burns through it before it sits around long enough to be used to make fat or muscle. Imagine a car where you've floored the accelerator. You'd need to keep adding gas more often and the engine would heat up more. Slower metabolisms run like a car that's idling. Their bodies burn through fuel at a slower rate, and so they tend not to need to eat as often. However, that means that the amount they normally eat can actually be more than what they need just to keep their body where it's at. They have extra fuel in them all the time, which tends to get stored as fat. So it's not really that all thin people have high metabolisms and all overweight people gave slow ones. It's really all about how many calories you put into your body versus how many your body needs. It's just that someone's metabolism can raise or lower this number from the average. So those with higher metabolisms tend to be skinny because their average food requirements are more than you'd think, and slower metabolisms tend to gain weight easily because they need less food than expected to keep their body going." ]
[ 13 ]
[ [], [] ]
[ "url" ]
[ "url" ]
6oin1r
Is it true that the human body cannot handle extreme acceleration? If yes, why is that so?
Are our bodies "biologically wrong" to handle high levels of acceleration?
Biology
explainlikeimfive
[ "dkhmilj", "dkhmlm8" ]
[ "Ever get punched? That's a strong acceleration. Jumping off a building, hitting terminal velocity, and slamming into the ground is also an extreme acceleration. Part of you is being subjected to a strong force, which is changing your speed/direction, and that part of you is then pushing on other parts of you. But the other parts of you have to be brought up to speed in order to move out of the way, and while that is happening, the 'already accelerated' part of you is being smashed against it, and smashing what it is touching. It in turn is slamming into more of you behind it. Your body is deforming by the acceleration, because it isn't uniform, and this damages and ruptures structures. If you can accelerate everything at once, at the same rate, then it won't hurt you at all, but that's hard to do. How do you speed up your blood with your body? How do you accelerate your brain with your head? Anything that isn't getting the same push, is potentially getting shoved around inside or against you." ]
[ 11 ]
[ [], [] ]
[ "url" ]
[ "url" ]
fxl3vx
How is it possible that people who file for unemployment don’t have to pay back any money in the US?
Economics
explainlikeimfive
[ "fmv1k3j", "fmv1khe" ]
[ "Because it’s one of the glorious taxes that you pay When you actually DO work. You can’t just get unemployment for no reason. You had to have lost your job and be actively searching otherwise you get nothing. And how much you get depends on how much you were making before." ]
[ 3 ]
[ [], [] ]
[ "url" ]
[ "url" ]
88s8dm
The Soviet DUGA system
What is it? Can it be used again even though it's abandoned now?
Technology
explainlikeimfive
[ "dwmzpzn" ]
[ "Hello, Chernobyl-visitor here. From what was explained to us on the Chernobyl Tour, DUGA radars send signals bouncing through a specific layer of Earth’s atmosphere (Ionosphere) which are received by a similar DUGA device on the other end. For the Chernobyl one, I believe that its counterpart was in Eastern Ukraine, although I’m not quite so sure about that. Whenever the signal sent by the transmitter hits something, it creates a “black image” on the receiver and generates a warning. During the test phase of Chernobyl-2 DUGA system, it had one false alarm that almost triggered a nuclear war against USA when it detected a plane and mistakingly thought it was a missile (or so we were told). Anyway, although the technology could still be used (not the Chernobyl one because it is mostly derelict), we have far more advanced tech nowadays, so I believe that although they could (theoretically) be rebuilt, they would be largely inefficient." ]
[ 6 ]
[ [] ]
[ "url" ]
[ "url" ]
9ti49x
Why can't we just build telescopes with a mirror diameter of 50/75/100m?
Are there construction issues? Technical Issues? Is there a cap on the telescope size where there are no more benefits?
Engineering
explainlikeimfive
[ "e8whbsl", "e8wixof" ]
[ "The precision used to make telescope lenses is insane, so making a lens that big without any flaws would be next to impossible. Not to mention how exactly would you move a lens that’s 100m wife safety to the observatory (since they’re usually located in the middle of nowhere to avoid light pollution)" ]
[ 4 ]
[ [], [ "https://www.eso.org/public/teles-instr/paranal-observatory/vlt/", "https://en.m.wikipedia.org/wiki/James_Webb_Space_Telescope" ] ]
[ "url" ]
[ "url" ]
elqpkt
How does popping candy work?
Chemistry
explainlikeimfive
[ "fdjq4h8", "fdjq5s4" ]
[ "When you put the yum yum in your mouth your slobber dissolves the candy, making the compacted gas to escape. It's the popping of the pressurized bubble wubbles that makes the sizzling sound and shoots pieces of candy around in your mouth." ]
[ 5 ]
[ [], [] ]
[ "url" ]
[ "url" ]
i0wmjw
Since a lower heart rate is healthy, does that mean a lower heart determines how long you will live?
Does a lower heart rate make you live longer since your heart is more efficient and is being used less. If so what is a good heart for someone that wants to focus on longevity, should peope focus on keeping resting heart rate under 75.
Biology
explainlikeimfive
[ "fzsxy3h", "fztam26", "fzszp02" ]
[ "I remember hearing that most animals have a similar number of heartbeats per life. Heart rate doesn’t directly determine life span, since there are 50 other things that could kill you. Exercising in general has been proven to help you live much longer." ]
[ 5 ]
[ [], [], [] ]
[ "url" ]
[ "url" ]
dou39g
; How do magnets attract/repel reach other?
Physics
explainlikeimfive
[ "f5qb2j9" ]
[ "Magnets create a disturbance in the electromagnetic field around them. This disturbance interacts with electrons in the area, changing their paths. When you place two magnets near each other their magnetic fields interact. This creates a force that attracts or repels them depending on the nature of the interaction." ]
[ 4 ]
[ [] ]
[ "url" ]
[ "url" ]
c2gmnu
Why are some food with lower calories make our stomatch feels fuller than others with higher calories?
For example, i feel so full after eating just a bit of sweet potatoes, but can't get enough with the original potatoes!
Biology
explainlikeimfive
[ "erjw8b4", "erjvrlb", "erkd6wo" ]
[ "Generally, we feel full when our stomach is full of food. Fibre fills up the stomach but doesn't really have much calories so makes us feel fuller. (vegetables have alot of fibre) There are however foods that 'hack' our fullness mechanism. For example, food that are rich in both fat and sugar (at roughly 50/50 ratio) stop us from feeling full so we eat alot more calories before we feel full. So most 'bingeable' foods are those that have a 50/50 fat and carbs content (ice cream, cakes, donuts, pizza, crisps etc Fat or carbs on their own don't do this and we feel full quickly after eating them separately. The combination of fat and carbs in modern foods is supposed to be one of the biggest contributing factors to the obesity epidemic." ]
[ 28 ]
[ [], [], [ "http://www.mendosa.com/satiety.htm" ] ]
[ "url" ]
[ "url" ]
88lc11
Why hasn't the Department of Justice prosecuted a single Wall Street CEO for fraudulent activities associated with the 2007/08 financial crisis?
Other
explainlikeimfive
[ "dwlexlc" ]
[ "Because piercing the corporate veil is rarely done; in limited circumstances very limited pretty much only when the corporation is set up solely for an illegal purpose. Otherwise it's the corporations that's liable for the activities of the corporation. The few exceptions would be insider trading, embezzlement, and criminal fraud (has to be specific)" ]
[ 4 ]
[ [] ]
[ "url" ]
[ "url" ]
b623p6
Why do smokers get an urge to light one up after eating, drinking alcohol etc..?
Other
explainlikeimfive
[ "ejhfgxl", "ejhfl24", "ejhk0em" ]
[ "I am a smoker. While I don't really have an educated answer, I can make a guess. Our mouths are used to the taste of a cigarette. If we don't smoke for a while, it feels more satisfying compared to lighting one back to back. After food is just another opportunity to get that satisfaction. I like smoking one after a meal." ]
[ 5 ]
[ [], [], [] ]
[ "url" ]
[ "url" ]
ljf72b
Can pouring hot water on windshield or window ice to melt it really crack the glass? or is it so rare that one shouldn't worry about it? and if so, how does it happen?
Physics
explainlikeimfive
[ "gnc6qo7", "gnc6a47", "gnc8573", "gncff28" ]
[ "When the glass heats up it expands. If it’s cold then pouring hot water on it will expand one side before the other and that causes stress inside the glass which might make it crack. Another big reason you shouldn’t try this is because if it’s really cold the boiling water could just freeze on the window or down the side of your car" ]
[ 11 ]
[ [], [], [], [] ]
[ "url" ]
[ "url" ]
diqbwd
Carbohydrates- The kinds and which ones are best for before and after athletic performance, role in recovery etc.
Biology
explainlikeimfive
[ "f3y73yz", "f3xu0p8", "f3ykr8o", "f3y9zal", "f3ykks5", "f3y8wma", "f3ydo55", "f40g1ht" ]
[ "Monosaccharides - Single subunit, very easily digested (or rather, straight up absorbed) in almost no time at at all. Glucose/dextrose, fructose. All are just converted into glucose in the body. Disaccharides - Two subunits. Slightly more complex, takes a little longer to digest (e.g. sucrose/table sugar). Polysaccharides - Many subunits. Varies in complexity and digestibility. Starches and glycogen are used for energy storage in plants/animals (respectively). Cellulose can only be partially digested (fiber). Provides your body with a moderate, constant supply of \"energy\". & #x200B; Before performance - Carb load. Doesn't matter what kind of carbs, as long as you get enough in your body. What you don't use in the next 2-4 hours is converted to glycogen and stored. Starches are dense so you can get a lot in at once. During/after performance - Simple carbs. Glucose/dextrose is the most readily utilized by the body (takes about 10-15 minutes after consumption). Liquids are preferred, as the body does not need to manually break it down. Recovery - Again, doesn't really matter, as long as you're eating enough. The more energy you give your body, the more likely it is that your body's cellular machinery can function optimally. & #x200B; tl;dr Doesn't really matter for most intents and purposes. Drink glucose/dextrose if you want a quick (10-15 min) boost of energy / if you want to raise your blood sugar. For everything else, you can eat anything you want (as long as you also incorporate fats, proteins, vitamins, and minerals). The more complex the carb is, the longer it takes to break down (but it will provide you with a steady source of energy). & #x200B; & #x200B; EDIT (eli3): Carbohydrates are like mini-batteries. Your body can use these batteries only if the batteries aren't still packed together. The simplest carbohydrates (monosaccharides) are one battery, so your body can immediately use them. Some batteries come in packs of two (disaccharides), so you'll need to separate them before you use it. Some batteries are heavy-duty and come in packs of hundreds to thousands (polysaccharides). It takes your body a while to separate them, but you won't need new batteries for a while. Whatever batteries your body doesn't use now will be stored and used later. Whenever you exercise, your body uses energy from the batteries. You want to store them before a big event (heavy duty polysaccharides), and quickly replenish them during and afterwards (simple batteries or double pack) without waiting for your body to break them down. Simplest carbs = monosaccharides = fruits, glucose, dextrose (or even honey) Two-pack = disaccharides = table sugar (sucrose), lactose, maltose Heavy duty = polysaccharides = starches, glycogen & #x200B; Edit 2: The battery analogy pretty much fails when we look at fats. The most I could say is that if carbohydrates represented AA batteries and clusters of AA batteries, then fats would be D-cell batteries and clusters of D-cell batteries. It's also very difficult to condense the entirety of carbohydrate metabolism into a single reddit post, so please no bulli." ]
[ 1868 ]
[ [], [], [], [], [], [], [], [] ]
[ "url" ]
[ "url" ]
6314bc
How does a fire cause a interstate highway to fall
How did the fire lead the highway in Atlanta falling. Why does it look like such a clean spit?
Engineering
explainlikeimfive
[ "dfqi8v9" ]
[ "The portion of the interstate that collapsed is made from precast concrete beams. A bunch of steel reinforcement bars (rebar) are shaped and welded into a beam and it's placed into a mold into which they pour the concrete. Those beams are then placed between structural supports and metal decking is placed between them. The concrete roadway or road bed is then poured on top of the metal decking. This is all made of material that contracts and expands with heat so at both ends there are expansion joints. In this case it's just a giant compressible rubber gasket that's about 4\" wide. Concrete is extremely strong when undergoing compressive forces but not so great when it's under a flexion load. The beams are cast in an arch so that when they are loaded(heavy stuff on top), the concrete is under a compressive load. The fire burned under the entire bridge and was hot enough to weaken the rebar. Think about the bridge like a long board that's supported by two chairs; one on either end. The roadway on top of the beams is \"really heavy\" and the weight is mostly evenly distributed among them. The weakened rebar caused the arch shape in the beams to deform enough to where the load on the concrete moved from compression to flexion. In the board analogy if you put enough weight on the middle of the board it'd sag. Keep adding weight and it'd deform enough to where the ends would slip off of the chairs. TL;DR The fire did NOT melt the steel; it just got it warm enough to where it was bendable. It bent enough to where the bridge beams slipped off of the supports on the ends" ]
[ 8 ]
[ [] ]
[ "url" ]
[ "url" ]
f2zfpu
What is actually happening when you drink something and it get's "caught" in your chest/throat and it's really painful?
Biology
explainlikeimfive
[ "fhfoi8e", "fhfv63p", "fhfv02t", "fhftphk", "fhftntu", "fhfpx6x", "fhfqjhi", "fhgoy2n", "fhg01yp" ]
[ "I'm a speech and language therapy student, so not sure but I think this is what I was taught: The pipe that goes from your mouth to your stomach, moves involuntarily. So it will move naturally and react to what is happening. Sometimes, it will also just have some spasm or not be ready for what's happening. F.e. when you swallow something thats really cold, it's more extreme of a sensation so the reaction can be different. So practically: it's just the tube (esophagus) that has a cramp, a spasm or some other strange reaction to a normal action (drinking) Since I don't study this in English, I hope I used the correct words and it's understandable :)" ]
[ 247 ]
[ [], [], [], [], [], [], [], [], [] ]
[ "url" ]
[ "url" ]
8yb4h4
with water's persistent and powerful erosive power, how are all rivers not straight lines from source to ocean by now?
Physics
explainlikeimfive
[ "e29h3hh", "e29gowv", "e29i9yl", "e29h5my" ]
[ "Because water has momentum. The flow around a bend digs into the far side of the curve while it slows down and deposits sediments on the inside of the curve. The result is that curves are exaggerated over time, and can even form circular oxbow lakes. The sediment deposits close off the circle and the river continues around it. Over geological time, the actual path of a river can change a LOT, wiggling across the land, carving new paths." ]
[ 107 ]
[ [], [], [], [] ]
[ "url" ]
[ "url" ]
6z536y
Why is medieval hand-wring so illegible?
In well-preserved medieval documents the hand writing is always impossible for me to discern. It doesn't matter how long I study the image I'll never make out the letters in [pics like this]( URL_0 ). Why was illegible handwriting the norm back then, and how do modern scholars make sense of it now? How did people back then make sense of it?
Other
explainlikeimfive
[ "dmsjrfk", "dmsjb6d" ]
[ "It is only hard for you to read because you are familiar with that style of cursive writing and you don't recognize the letters. The way letters was written have changed over time You might even have problem with more modern cursive writing even when it is written with a ballpoint pen that you are used to since that kind of writing is not that common today. The old styles was for dip pens and fountain pens. How they worked and the wider line influenced how letter was written Look at [Fraktur]( URL_0 ) that was used in part of Europe to the mid 20th century and you will have problem to read it even when is printed." ]
[ 11 ]
[ [ "https://en.wikipedia.org/wiki/Fraktur" ], [] ]
[ "url" ]
[ "url" ]
85dm1f
How does muscle memory work?
So I have wondered for quit some time, how does muscle memory work? Basically for example when you play video games?
Biology
explainlikeimfive
[ "dvwnpmp", "dvwm8y2", "dvwsyo7" ]
[ "The important thing is that muscle memory is *not* \"memory that muscles have\". Muscles don't have memory. That's just not something that they can even do. Instead, muscle memory is \"memories your brain has about moving specific muscles\". In short, repeating an action a bunch of times makes it easier and easier for your brain to kind of do it \"automatically\", without you having to consciously think about it. Kind of like how a toddler will stumble and fall a lot when trying to even walk in a straight line, while an older child will have mastered walking and turned it into muscle memory, so they don't have to consciously think about moving their muscles in a coordinated manner just to walk." ]
[ 13 ]
[ [], [], [ "https://en.m.wikipedia.org/wiki/Cerebellum" ] ]
[ "url" ]
[ "url" ]
ff3xqy
Why are campuses closed and major events cancelled in the wake of covid-19, while life goes on as normal during flu season every year?
Biology
explainlikeimfive
[ "fjvbi8g" ]
[ "1) We know the dangers of the flu and what it does. We don't fully understand COVID-19 or how dangerous it can be. We do have reason to believe that it does more to a person's lungs than a regular flu. 2) There is a flu vaccine that people can get to help make their protection against the flu better. There is no COVID-19 vaccine." ]
[ 4 ]
[ [] ]
[ "url" ]
[ "url" ]
9pcg4k
How much of a temperature increase would there be if you poured a boiling kettles worth of water into a hot bath?
Other
explainlikeimfive
[ "e80n7n2" ]
[ "How much water is in the bath? How much is in the kettle? How hot is the bath water?" ]
[ 10 ]
[ [] ]
[ "url" ]
[ "url" ]
a1lb4l
Why don’t airlines let people seated in the back of the plane or in window seats board in Zone 1?
Other
explainlikeimfive
[ "eaqq5mc" ]
[ "There have been numerous studies regarding efficient plane boarding. Wouldn't it make more sense to board back to front? window seats first? stagger the seats? etc? The answer is yes, any system is better than what is basically rush seating that airlines use today. The problem is people. Certain people will always rush to board the plane first, even if it isn't their turn. In every test performed if even a single person boards the plane out of order it throws the entire system out of whack. Arguing with those people and asking them to take their place in line causes so many problems, incidents, and delays that it just isn't worth it. So the researchers came to the conclusion that it's better to just let people board randomly." ]
[ 6 ]
[ [] ]
[ "url" ]
[ "url" ]
eopfch
Why does the gasping continues even after the crying is finished?
Biology
explainlikeimfive
[ "feej8t0" ]
[ "Basically when you cry, the body turns into a mess of fight-or-flight vs relax. Emotional stress causes the breathing to shift from abdominal breathing to coastal breathing (you stop belly breathing and start chest breathing). This is less efficient in the exchange of oxygen than belly breathing. Your diaphragm is forced out of its regular rhythm. When you stop crying, your diaphragm struggles to find its rhythm again, making you gasp. Another part of this is that deep breaths help stimulate the “relax” part of your nervous system, which is why people unconsciously use it after crying to both calm themselves down, compensate for the lack of oxygen acquired during the crying, and help the diaphragm fall into its normal pattern again" ]
[ 14 ]
[ [] ]
[ "url" ]
[ "url" ]
fmrbg9
How do they demolish buildings in densely populated and built up areas without destroying things nearby?
Engineering
explainlikeimfive
[ "fl5qke2", "fl5naze" ]
[ "Depends on the height of the building. For shorter buildings they'll use a simple crane and wrecking ball. Most debris will fall withing the building's footprint. However as you get taller that technique would take forever and the higher the debris breaks off the less control you have of where it falls So at heights they will use explosives. They will target the central structural supports of the building the whole way up. like pulling the center card out of a house of cards, the whole thing will collapse inwards into its own footprint. Now the actual math and planning behind it is very complex and changes from job to job but that's the basic idea behind it" ]
[ 4 ]
[ [], [] ]
[ "url" ]
[ "url" ]
8a80nd
How do water towers work over such large distances?
Physics
explainlikeimfive
[ "dwwkek5", "dwwjy23" ]
[ "Friction DOES reduce the pressure as water flows through a pipe. This effect can be seen by attaching two or more long garden hoses to a tap; the longer the hose is extended, the lower the pressure at the nozzle. But in the example you cited, if the pipe is smooth enough and wide enough, and the initial pressure is high enough, the water flow will overcome the friction and flow the entire distance of the pipe. For more informaton, consuit a fluid dynamics textbook." ]
[ 13 ]
[ [], [] ]
[ "url" ]
[ "url" ]
kdgeor
The Mandelbrot Set
Mathematics
explainlikeimfive
[ "gfwclwf" ]
[ "Whatch this, it does a good job of explaining URL_0" ]
[ 3 ]
[ [ "https://m.youtube.com/watch?v=ovJcsL7vyrk&fbclid=IwAR3dzfkcbKY6CNVKTwq3gTYXWPAGxI4_RqfhyKy-InO_c9QnMM-D_pfRE38#menu" ] ]
[ "url" ]
[ "url" ]
i1nna3
why were all the animals so large in the past?
Biology
explainlikeimfive
[ "fzynj7x", "fzymlw0" ]
[ "there have been periods in Earth's history when there were many very large animals, but we tend to see them as if through a telescope backwards - millions of years of time scrunched into a \"single set\" of fossils. For example, the dinosaurs - they lived for many millions of years, and we see a single collection of huge beasts and tend to think of them as all living at the same time. Inversely, we see the animal kingdom around us a snapshot of a very few years, but \\*all\\* the animals alive at the same time. We've got huge beasties now, too: elephants, whales - including the largest animal to have *ever lived* is alive right now. And tigers - did you realize Tigers can be over ten feet long? Moose can be over 7 feet tall and weigh nearly a ton.A Kodiak bear can be almost 10 feet tall standing on two legs and also weighs nearly a ton. Some seals get that big and weigh over a ton - think big pickup truck sized critters. There's another important factor: selection bias. Larger animals' skeletons are more likely to be fossilized, and of all the fossils, the bigger ones are more likely to be noticed. So we think of dinosaurs as huge, and they were generally larger than mammals, but there were some dinosaurs as small as cats and dogs." ]
[ 12 ]
[ [], [] ]
[ "url" ]
[ "url" ]
cmr1v4
Why North America and Australia use different kind of trucks than Europe?
Other
explainlikeimfive
[ "ew430r6", "ew42iyk" ]
[ "Additionally to what the other guy said, there also are laws limiting the length of the cab and the whole truck in Europe. Less cab, more load." ]
[ 8 ]
[ [], [] ]
[ "url" ]
[ "url" ]
nus7j2
Why does food's taste fade away the more we chew it?
Biology
explainlikeimfive
[ "h0za847" ]
[ "This phenomenon varies between different food types. Put simply, as you chew, your saliva dissolves the food in your mouth to help you swallow it. The first thing your saliva touches is the outer layer of your food. In the case of prepared meals like steak and pasta, the main flavor is on the outermost layer of your food, as you chew and swallow the saliva in your mouth it takes the flavors (herbs, spices, salt, seared crust etc.) down with it and you taste more of the remaining meat or wheat in these examples, which don't taste as flavorful without that outer seasoning. This is also why if you don't like the flavor of broccoli or peas, they taste worse the more you chew them, since the seasoning washes down with your saliva and the vegetable taste starts coming out. You'll notice that this doesn't happen with fruits, ice cream, or chocolate etc. since in those cases all layers of what you're eating have the same flavor." ]
[ 25 ]
[ [] ]
[ "url" ]
[ "url" ]
92812v
What is the purpose of the cloth in waterboarding
Other
explainlikeimfive
[ "e33qst5", "e33qrqb", "e33r0p3", "e33qqau", "e3418vs" ]
[ "It restricts airflow and allows the water to seep through into the nostrils. It makes the difference between the hose-to-the-face uncomfortableness and the oh-god-i'm-drowning of waterboarding." ]
[ 24 ]
[ [], [], [], [], [] ]
[ "url" ]
[ "url" ]
alr301
Why is it when you take a dump sometimes you just have to wipe until you use half the roll and other times it just take 1 swift wipe even with the same type of fecal structure?
Biology
explainlikeimfive
[ "efgao04" ]
[ "the composition of your poop is different based on what you eat. if you eat a lot of fiber you won't have to wipe as much. I'll take metamucil (a fiber supplement) sometimes because it makes wiping so easy. Without it... well lets just say my life is better with it. If i have a glass of metamucil 2 days in a row, by day 3 I don't need to wipe at all anymore. I mean, I still do of course, but the paper will be clean. Its way better then wet wipes." ]
[ 13 ]
[ [] ]
[ "url" ]
[ "url" ]
7ny28s
How does Co2 in the atmosphere lower produce nutrients?
This seems to be a muddy topic because of political agendas so I'm hoping to get a more clear cut, scientific answer. I've searched quite a bit and it's just a tad too wordy for me to fully understand what's happening. What exactly does the increased Co2 in the atmosphere do to plants that makes them lose nutrients such as iron, zinc and protein?
Biology
explainlikeimfive
[ "ds5cqdd" ]
[ "Do you have a source for the fact that it does? It can make certain plants grow less just because they need a certain ratio in the atmosphere. So overall it could produce less if the plant was smaller. But global impact wise there are a lot bigger issues than any minor impact on crop nutrients. I work in the field of environmental engineering and I never hear that mentioned." ]
[ 6 ]
[ [] ]
[ "url" ]
[ "url" ]
66szkj
Whats the origin of physical greetings like hugs and handshakes?
What I want to know I guess is where/how this started, and how far back did it come from, also the psychological aspects and biologically why we hug and kiss and handshake etc. Thanks in advance
Biology
explainlikeimfive
[ "dgl39h1", "dgl52vo" ]
[ "as for handshakes, it is thought they were a way to prove you were unarmed, and thus friendly, with the \"shake\" part meant to dislodge weaponry hidden up one's sleeve" ]
[ 5 ]
[ [], [] ]
[ "url" ]
[ "url" ]
jardt1
How is it that my eye is able to close before something splashes into it?
Do my eyes see something coming (reflexes can’t be that fast right?) or does it hit my eyelashes or something (still fast reflexes??)?
Biology
explainlikeimfive
[ "g8ra6k9", "g8rap5x" ]
[ "Someone else will have to add the scientific terminology because it completely escapes me right now. Anyway, our brains are specifically wired so that if we notice something that our unconscious brain perceives as potential threat, like a fast moving and/or large object, a possible predator, or something small headed right for an eyeball, the involuntary/unconscious parts of our brains will actually bypass the thinking centers of the brain and send commands directly to the movement and fight-or-flight sections. This is what allows reflexes to work so suddenly and quickly, and why sometimes, people will react to a perceived threat and have absolutely no idea what happened. It's because their brain bypassed anything that required understanding or thought in order to save time and increase the chance to survive." ]
[ 7 ]
[ [], [] ]
[ "url" ]
[ "url" ]
me710f
why are nuclear explosions so huge?
what about the way nukes work makes the explosion so tremendous? i know nuclear explosions are big, but what makes them big?
Physics
explainlikeimfive
[ "gsdyejw", "gsdz4qg", "gsdyxjm" ]
[ "The energy released during the interaction of nuclei is much higher than that of full atoms. One atom splitting releases way more energy than one molecule of TNT decomposing. So, you get 600,000,000,000,000,000,000,000 of them together, and the nuke is going to release way more energy. That energy, in both cases, causes heat and violent expansion." ]
[ 13 ]
[ [], [], [] ]
[ "url" ]
[ "url" ]
6y031m
what actually causes genetic issues if breeding pair are for example siblings?
i guess we've all seen the whole 'little hickville town with mutated villagers' horror scenes in series and movies. would human beings (or other mammals) actually mutate into barely recognizable as humans like that if for example siblings had babies together for several generations? from the very little i've read, i just came to the conclusion that inherited health issues would be more likely to manifest themselves but beyond that and the whole social stigma thing the offspring would be relatively normal. if i'm wrong, what causes it?
Biology
explainlikeimfive
[ "dmjrbnu", "dmjoij4", "dmjoknz", "dmjq7sv", "dmjoqjz", "dmjop9r", "dmkbzoc" ]
[ "Our DNA has redundancy built in: it comes in two halves. Each half can potentially bear faulty copies of a bunch of genes - but so long as there's a working copy in the other half, you're fine. Think of two pieces of paper, each with a random set of holes in it. Put them together, and so long as none of the holes line up, you effectively have a complete sheet. When two organisms breed, they take half the DNA from each parent - one sheet of paper each in this analogy. If the two parents are only very distantly related, it's a pretty good bet that they'll have few or no faulty genes in common - any holes they have will likely be in completely different places, and so won't line up. If the two parents are very closely related, however, those two pieces of paper will have a very similar pattern of holes, so at least some of them will very likely line up, and the offspring will get two broken copies of the gene. If they're lucky, this doesn't make a whole lot of difference.... but if they're not, really important stuff can get fucked up." ]
[ 77 ]
[ [], [], [ "https://imgur.com/A24P5lu" ], [], [], [], [] ]
[ "url" ]
[ "url" ]
bgypv4
How does your mobile phone upload / send data to a cellphonetower or WiFi router?
I understand that cellphonetowers have very powerfull antennas to send data to the receiver on our phones. But how does a phone send data back? The antenna on a phone isn’t powerfull enough to send data over great distances? Same goes for wifi; the router contains a big antenna to send data, but the phone doesn’t have a large antenna to send data back?
Technology
explainlikeimfive
[ "elojmun" ]
[ "Big antennae allow for greater range of both sending and receiving radio signals. That's why you could, back in the day, get a big ol' antenna for your car that would boost the range that you could hear a radio station by for a bit. The antenna in your phone is large enough to receive and transmit back to the cell tower, but the cell tower's antenna is the major contributor to that situation; you'll notice that you need significantly larger and more exposed antenna in all but the most expensive walkie-talkies, which simply pick up and broadcast anything on a certain channel frequency, rather than use rotating code to tell a central controller/router what signals go to what devices." ]
[ 3 ]
[ [] ]
[ "url" ]
[ "url" ]
bc4i1l
Whats the difference between an asylum seeker and a refugee?
I know that the terms are interchanged often and can be wrongly interchanged. So what is the difference? Can one be the other or are they completely separate terms?
Culture
explainlikeimfive
[ "eknqhub", "eknq2iv", "eknqot1" ]
[ "Refugee refers to someone displaced from their homeland by a cause outsode their control - war, famine, acts of God, etc. An asylum seeker is a refugee petitioning the right to remain in a country due to valid concerns for their safety and wellbeing which would almost certainly be jeopardized by returning to their nation of origin." ]
[ 9 ]
[ [], [], [] ]
[ "url" ]
[ "url" ]
7i30vn
Why do tea bags say ‘Do Not Microwave’?
Does it have to do with how the tea steeps? Or something with metal staples on the bag?
Chemistry
explainlikeimfive
[ "dqvqq6i", "dqvsomn", "dqvzk2q", "dqw48io", "dqw6e06", "dqwqcfv" ]
[ "Because you are doing it wrong! You are supposed to put tea into boiling water all at once, not slowly heat it up with the water. It does taste different that way. EDIT: To be clear, you don't put tea in water while it is still boiling, you bring the water to a boil, let it cool a bit, then put it in." ]
[ 1466 ]
[ [], [], [], [], [], [] ]
[ "url" ]
[ "url" ]
5nnlsu
When a meteorite strikes a planet and leaves a crater, why is there a big hole but no meteorite in it?
Where does it go?
Physics
explainlikeimfive
[ "dccwcbs" ]
[ "When it hits the planet, there is so much energy it literally explodes. That's why there's a crater and nothing bigger than meteorite gravel left behind. Think about tossing a snowball at a wall." ]
[ 25 ]
[ [] ]
[ "url" ]
[ "url" ]
ctz9sz
Why do asteroids make such a big boom on impact?
Physics
explainlikeimfive
[ "expegv8", "expf27h", "expdkvr" ]
[ "Because they're going really *really* fast, and sometimes can be really *really* big. The Chelyabinsk meteor that hit Russia in 2013 (although it didn't impact the ground, it broke up in the atmosphere) was only 20 meters in diameter, entered the atmosphere at over 19km/s, releasing the energy equivalent to 500 kilotons of TNT. That's more than 25 times the energy of the atomic bombs dropped on Japan." ]
[ 8 ]
[ [], [], [] ]
[ "url" ]
[ "url" ]
707jhj
Why is it hard for people to change thier beliefs? What causes us to grip on to things that have been proven to be false?
Wow! Didn't expect this much attention! There's lots of great responses here. The reason behind my question is that it seems really easy to say, "oh snap I guess you are right and I'm wrong", which is apparently hard for people to do. This is true for me in pretty much everything. I just was wondering why it is difficult for others to do. Lots of good reasons here though!
Biology
explainlikeimfive
[ "dn13544", "dn1aojk", "dn1f52r", "dn1734h", "dn18jbn", "dn11vo0", "dn1674p", "dn18i1f", "dn15qk8", "dn16nmm", "dn12fed", "dn1q8gb", "dn1bed7", "dn168n4", "dn1a9iw", "dn1e9e6", "dn1gxcn", "dn16kpn", "dn1dnqp", "dn1cnh1", "dn1aatq", "dn1h9ks", "dn1ogrl", "dn183ru", "dn1fqte", "dn1h5em", "dn1br0e", "dn1f10z", "dn19l7m", "dn1g2zc", "dn1gl2t", "dn1q8yh", "dn1fd7f" ]
[ "The terrific blog \"You Are Not So Smart\" tackled this question back in 2011. [The Backfire Effect]( URL_0 ) > **The Misconception:** When your beliefs are challenged with facts, you alter your opinions and incorporate the new information into your thinking. > **The Truth:** When your deepest convictions are challenged by contradictory evidence, your beliefs get stronger. The best paragraph from that which summarizes the answer: > Once something is added to your collection of beliefs, you protect it from harm. You do it instinctively and unconsciously when confronted with attitude-inconsistent information. Just as confirmation bias shields you when you actively seek information, the backfire effect defends you when the information seeks you, when it blindsides you. Coming or going, you stick to your beliefs instead of questioning them. When someone tries to correct you, tries to dilute your misconceptions, it backfires and strengthens them instead. Over time, the backfire effect helps make you less skeptical of those things which allow you to continue seeing your beliefs and attitudes as true and proper. Check out the whole thing. [It's really worth a read.]( URL_0 )" ]
[ 4718 ]
[ [ "https://youarenotsosmart.com/2011/06/10/the-backfire-effect/" ], [], [], [], [], [ "https://en.wikipedia.org/wiki/Cognitive_dissonance" ], [], [ "http://gatherer.wizards.com/Pages/Card/Details.aspx?multiverseid=121263", "http://gatherer.wizards.com/Pages/Card/Details.aspx?multiverseid=425844", "http://gatherer.wizards.com/Pages/Card/Details.aspx?multiverseid=383181", "http://gatherer.wizards.com/Pages/Card/Details.aspx?multiverseid=113512", "http://gatherer.wizards.com/Pages/Card/Details.aspx?multiverseid=193499", "http://gatherer.wizards.com/Pages/Card/Details.aspx?name=serra+ascendant" ], [], [], [], [], [], [], [], [], [], [], [], [], [ "https://www.theguardian.com/society/2016/apr/07/the-sugar-conspiracy-robert-lustig-john-yudkin" ], [], [], [], [], [], [ "http://climatecommunication.yale.edu/" ], [], [], [], [], [], [] ]
[ "url" ]
[ "url" ]
m046x2
The difference between 4WD and AWD.
Other
explainlikeimfive
[ "gq5ur1e" ]
[ "AWD is all the time, 4WD is selective, but there’s usually two options. You’ve got 4WD high, and 4WD Low. You can use the high gear version for snow and stuff like that at regular speeds but 4WD low is for getting out of super muddy places and/or pulling things. 4WD low is what I would use to pull a stump cuz it’s got a lower gear, better for pulling" ]
[ 7 ]
[ [] ]
[ "url" ]
[ "url" ]
8taa5a
How do you program a self driving car to do this or that?
Technology
explainlikeimfive
[ "e15y3s1", "e15wdzy", "e161bm9" ]
[ "It’s a popular misconception that AI programmers can even begin to deal with ethical problems in self driving cars. The answer is NO, they do not program choices into driving (hit the woman with baby or hit the 5 people on sidewalk). Bottom line is that self driving vehicles are programmed to stop and slow down given what is in front of them. If a baby crosses the street in front of the car, the only “decision” the car makes is “obstacle detected. Slam on brakes, downshift, stop” Anything else you’ve heard on the subject is pure fantasy." ]
[ 7 ]
[ [], [], [ "https://youtu.be/qv6UVOQ0F44" ] ]
[ "url" ]
[ "url" ]
5yxfnc
Why can we land a robot on an asteroid but cant design a vending machine to take a slightly crinkled dollar bill?
Technology
explainlikeimfive
[ "detntop", "detqods", "detnglb", "detpfkf" ]
[ "If a vending machine was made to have some leeway with bill and coin shape/sizes, it would be easier to make them accept fake money." ]
[ 24 ]
[ [], [], [], [] ]
[ "url" ]
[ "url" ]
bdqszz
What are metaphysics?
Other
explainlikeimfive
[ "el05lge", "el09rpj" ]
[ "It's a branch of philosophy that deals with reality and existence. Questions that can't be answered or measured in science, like how do we know what reality is, what does it mean to exist, what is consciousness, what is there beyond time and space etc." ]
[ 6 ]
[ [], [] ]
[ "url" ]
[ "url" ]
edtslu
How does water get from your basement to the top floor? It seems like as soon as you turn on water anywhere it is immediately ready. How is this always the case?
Physics
explainlikeimfive
[ "fbktz8n" ]
[ "Water flows into your home under pressure. When the water service is first turned on, someone opens the taps, and the incoming water forces out any air that was in the pipes. Once that's done, the pipes are full of water. When you open a faucet, the pressure of the incoming water (all the way down in the basement) forces the water that's already in the pipe to come out of the faucet. The water that comes out of your tap right away has been sitting at the tap all along." ]
[ 4 ]
[ [] ]
[ "url" ]
[ "url" ]
ilo5kp
Why is it that we can consume certain products (water, coffee/tea, beer/wine, etc) multiple times on a daily basis without ever getting tired of them, while other things (pizza, tacos, sushi, etc) we can only have once or twice in a short timeframe before being “burnt out” on them for a while?
Biology
explainlikeimfive
[ "g3tgu3b", "g3tjwmr", "g3tgypl" ]
[ "This sounds psychological. I can eat tacos every day forever but my neighbor would probably feel like that life is hell. There are some foods though, like salt or sugar based that probably make everyone feel icky after a while because your body wants to reject it." ]
[ 18 ]
[ [], [], [] ]
[ "url" ]
[ "url" ]
aj9ko9
Why, when trying to sleep, does our head want to be cold/cool, but our body want to be warm?
Biology
explainlikeimfive
[ "eetz92r", "eeugqd8" ]
[ "So basically when we sleep our body lowers it's core temperature and then slowly raises it again as the morning gets closer. A cool pillow helps the body achieve that prime \"sleep temperature\" by transferring our heat to said pillow allowing us to sleep more deeply. Source: 11th grade biology teacher told me" ]
[ 55 ]
[ [], [ "https://www.straightdope.com/columns/read/3197/does-sleeping-naked-prevent-diabetes/", "https://asknature.org/strategy/large-ears-used-to-cool-off/#.XEnO7VVKiUk" ] ]
[ "url" ]
[ "url" ]
fsgs4p
Why is it then when you drain water in a sink or tub, rather it’s open or has a grate, it still spirals while going down and not just fall down the drain?
Physics
explainlikeimfive
[ "fm1a81w" ]
[ "Because there is more water than can go down the drain at that moment in time. Since the excess water can't go down the drain, it has to go *around* the drain. When enough water is going around the drain in the same direction, it forms that vortex." ]
[ 8 ]
[ [] ]
[ "url" ]
[ "url" ]
kln9cp
are space probe photos of outer planets what a human eye would see? How dark is it out there?
Photos of planets like Jupiter and Neptune are bright and vivid, but they're so, so far from the sun. If I was sitting on top of a space probe, would Neptune look as sunlit as in the photos we see, or would it be practically pitch black and the photos are, like, hour-long exposures?
Physics
explainlikeimfive
[ "gh9ycx2" ]
[ "Well, you can look up in the sky and spot jupiter from earth. So that should answer that one for you. As for neptune, it will be darker, as it is further away, but not so dark as not to see anything. Cameras can just have more sensitive sensors in them and use bigger lenses or HDR techniques to produce a clear image if it is an issue." ]
[ 5 ]
[ [] ]
[ "url" ]
[ "url" ]
80v45y
Why did humans choke to death on food/objects instead of letting it pass into the lungs, it may hurt, but at least we'd be alive...?
Biology
explainlikeimfive
[ "duydqu4", "duydsh8", "duydtbv" ]
[ "The trachea (wind pipe) and the airways that branch off of it get continually smaller as you go down further into the lungs. Choking happens when the food or other foreign object gets stuck somewhere between the opening of the trachea and the carina (where it branches to go towards both lungs) so that the entire airway is nearly or completely blocked off. Since that is the only tube carrying air between the pharynx and the lungs, no air is able to get to the lungs. If the object were small enough to make it past the carina it would likely lodge in a location where it would affect at most one lobe of a lung (right lung has 3 lobes, left has 2) and cause localized problems there without causing the person to choke, as most of their airway is unobstructed." ]
[ 12 ]
[ [], [], [] ]
[ "url" ]
[ "url" ]
7c1sdc
Why are the heating vents placed over windows in homes and heaters over the entry doors in big stores? It seems like it would be inefficient as all that warmth gets lost to cold outside temperatures.
Engineering
explainlikeimfive
[ "dpmic19", "dpmgp1n", "dpmhmvd", "dpmr5al" ]
[ "The reason is sort of basically to counteract the worst areas of weather differentiation. Window glass is the coldest part of a wall. When warm room air hits it, the air cools, and cool air sinks. The movement of cool air creates floor drafts that most people find uncomfortable. The placement of forced-air heat registers or baseboard heating units under the windows counteracts this process by sending up warm air to mix with the cool. The end result is that the room feels more comfortable. The reason is because the heat loss occurs mostly in the windows and the fenestration. The idea is that you would like the incoming air to be heated up. Also, it creates an air curtain that prevents more heat from being lost through these exposed areas. Finally, it makes the temperature of the room more or less uniform. If the heaters were placed at the center of the room, you would create a large temperature gradient, resulting in drafts and discomfort for the occupant. source: URL_1 URL_0 and that I have a minor in architecture" ]
[ 21 ]
[ [ "https://physics.stackexchange.com/questions/87731/why-are-radiators-always-placed-under-windows", "https://www.thisoldhouse.com/ask-toh/placement-heat-registers" ], [], [], [] ]
[ "url" ]
[ "url" ]
hhnek1
How do "abandoned" trails stay clear of plant life for so long?
I know that often it is people walking over them, but I have hiked on "abandoned", unmaintained, and seldom walked trails and still seen clear packed dirt. I have always known plants to be such eager growers... how could they not resist that open space?
Biology
explainlikeimfive
[ "fwb2rwj", "fwb99eg", "fwbb79u", "fwb9r7l" ]
[ "Animals use them, and it doesn't take much traffic to clear a trail. I have a herd of goats that keep paths open all over the place." ]
[ 31 ]
[ [], [], [], [] ]
[ "url" ]
[ "url" ]
5w6q3h
Why are your two front teeth so much more sensitive than your other teeth?
Biology
explainlikeimfive
[ "de7za0m", "de83djy", "de80p72" ]
[ "Are you sure this isn't just you? I have not experienced this, nor heard it mentioned by my dentist or other people." ]
[ 10 ]
[ [], [], [] ]
[ "url" ]
[ "url" ]
evs1tk
Why are Canadian tax rates similar to US tax rates when Canada provides socialized health care and more social programs?
I know that Canadian tax rates are technically higher but from what I've looked at it's only by 1-3%, how is this 1-3% difference able to support an entire socialized health care system as well as a ton of other social programs that the US government does not provide? I'm not trying to start some political debate in the comments I just don't understand why taxes in the US aren't lower if they don't have socialized healthcare.
Economics
explainlikeimfive
[ "ffxrgy4", "ffxle7c", "ffxp6l8", "ffxmwvk" ]
[ "It's not military spending. [World bank says]( URL_1 ) that Canada spent 1.3% of GDP on military while the US spent 3.2%. (2018 data) Meanwhile the [world bank says that health care expenditure]( URL_0 ) is 10.53% of GDP for Canada and a whopping 17.07% for the US. (2016 data) Military spending is just not the big chunk people think it is. US health care is just horribly inefficient." ]
[ 7 ]
[ [ "https://data.worldbank.org/indicator/SH.XPD.CHEX.GD.ZS", "https://data.worldbank.org/indicator/MS.MIL.XPND.GD.ZS" ], [], [ "https://www.ft.com/content/e92dbf94-d9a2-11e9-8f9b-77216ebe1f17" ], [] ]
[ "url" ]
[ "url" ]
ajlm70
The rules of Dungeons and Dragons.
Other
explainlikeimfive
[ "eewiw5j" ]
[ "There's way too many to ELI5 to be honest. Do you think you could narrow down parts that you need explained?" ]
[ 3 ]
[ [] ]
[ "url" ]
[ "url" ]
aabsxm
Why does putting a damp paper towel under a cutting board make it harder to move?
Other
explainlikeimfive
[ "ecqluk2" ]
[ "Unless both your cutting board and your countertop are perfectly smooth, they will only touch each other at a few points. This lack of physical contact means that there isn't much friction between the two surfaces. A towel will conform to the shape of both the countertop and the cutting board better and make for more surface area in contact. Making the towel wet adds the friction of surface tensions." ]
[ 19 ]
[ [] ]
[ "url" ]
[ "url" ]
92mwze
Why does your body get the tingly good feeling when you stretch?
Biology
explainlikeimfive
[ "e37ai59", "e373uw8", "e37cm4s" ]
[ "When our muscles and ligaments aren't moved often, they tend to cramp up. We don't move as much in our sleep as we do when we are awake. When we stretch, it helps our bodies release waste and stress from sleeping and helps rejuvenate our ligaments and minds. Stretching helps us wake up more and prepare us for our days. When you sleep, your muscles lose tone and fluid tends to pool along your back. Stretching helps to massage fluid gently back into the normal position. Also, your muscles protect themselves from over-extension by inhibiting the nerve impulses as they approach their limit." ]
[ 15 ]
[ [], [], [] ]
[ "url" ]
[ "url" ]
fo3c4k
When you take long exposure pictures of galaxies from earth, how do you counter the fact the telescope is rotating with the earth and so wouldn’t be pointing at these galaxies for say 13 hours?
Other
explainlikeimfive
[ "flcvf61", "flcwm0k" ]
[ "The telescope is mounted on a motorized tripod which is programmed to track the rotation of the Earth." ]
[ 7 ]
[ [], [] ]
[ "url" ]
[ "url" ]
i7dcb0
Why does the universe have 3 spatial dimension but only 1 time dimension? Is there some known reason for this asymmetry?
Physics
explainlikeimfive
[ "g135ano" ]
[ "There seem to be, or have been, answers to this with a physical background, so I'd like to pitch in a non-physical take: Because that's all we can perceive. This model, three spatial dimensions and a dimension for time pretty accurately models the human experience of reality. Even if there were spatial hyperdimensions or vertical time dimensions, we cannot perceive them, which is why our model of dimensions does not include them, at least not in a simple model like this. So, this might be more a problem with the model and the target audience than with nature itself. A six-dimensional being probably had a widely different model of the dimensions we would fail to understand." ]
[ 3 ]
[ [] ]
[ "url" ]
[ "url" ]
g981wi
What is/is there anything outside of space?
I’ve seen things that say space goes on forever or if you keep going in one direction you end up back where you started, so is there anything outside of that loop?
Physics
explainlikeimfive
[ "forwbsz" ]
[ "Im in no way professionally educated in this so take what I say with a grain of salt. So, the short answer is that we don't really know, but we have hypotheses. You described going in one direction, and ending up where you started, similarly to travelling on Earth. This is indeed one of the possibilities of how our universe is built. This would mean that the fabric of space \"bends\" so to say, much like the curvature of the Earth \"bends\" the land so that it meets up with itself. This means that traversing our universe would follow the same logic as travelling on Earth. The thing is, on our Earth, we move two dimensionally, as in North, South, East and West, even though the planet is a 3-dimensional object (ie. moving on a sphere's 2 dimensional surface). On Earth you cannot move in the third dimension (up) and end up in the same place again. In space though, you can move in any 3-D direction, which rules out our universe being shaped like a sphere. Instead, we have to think one dimension bigger, a hypersphere. Id recommend you google the shape of a hypersphere. Basically it's a 4-dimensional object with a 3-dimensional surface, in the same way that a 3-dimensional sphere has a 2-D surface. It would allow us to travel in any direction and end up back where we started. Answering what is \"outside\" our universe is pretty much just conjecture. The first question we need to ask is whether our universe is infinite or not, or whether there are alternate universes right next to ours, yadda, yadda. We don't really know. But we do know that our universe is expanding, so what is it expanding into? The answer is that it is most likely expanding into itself. Much like a fractal. Even if our universe is infinite, it can still expand, since some infinities can be bigger than others. For example, all numbers greater and lesser than 0 being a bigger infinity than just all numbers greater than 0. Sorry I dont have a super concrete answer, but honestly, that's probs something this question will never really have. I could recommend a youtube channel called PBS Space Time." ]
[ 9 ]
[ [] ]
[ "url" ]
[ "url" ]
avvw35
How does antiperspirant deodorant actually stop you sweating?
Chemistry
explainlikeimfive
[ "ehi3i3k" ]
[ "Antiperspirants contain aluminum salts that will block sweat. When they come into contact with sweat they form a gel that blocks your sweat glands." ]
[ 3 ]
[ [] ]
[ "url" ]
[ "url" ]
byct6b
How do the scientists know what the core of other planets are made of, (eg: Mars’ core is iron, Neptune’s liquid diamond) even though mankind has never been there?
Chemistry
explainlikeimfive
[ "eqg307t", "eqg2dfc" ]
[ "No, they dont guess. Their mass is determined by their gravity, which is determined by how they affect over objects. This gives them indications on density. Spectrometry will give them the atmospheric makeup and density and math solves the rest. URL_0 Guessing. Lol, just feaking lol. Ignore everything that guy wrote." ]
[ 22 ]
[ [ "https://courses.lumenlearning.com/astronomy/chapter/composition-and-structure-of-planets/" ], [] ]
[ "url" ]
[ "url" ]
h9d5ag
why people’s faces go red when embarrassed?
Biology
explainlikeimfive
[ "fuvygdd" ]
[ "That red color comes from the blood vessels in your face opening wider to allow more blood. It’s a reaction to the embarrassment" ]
[ 3 ]
[ [] ]
[ "url" ]
[ "url" ]
g6l5lf
Why don’t fish get thirsty?
Biology
explainlikeimfive
[ "foaf2tc" ]
[ "Fish actually need to work to keep water OUT rather than in. We’re the opposite which is why we have a thirst reflex and organs such as kidneys. Life began in the ocean, so the only way creatures can live on land (in dry air) is due to adaptations like the aforementioned allowing us to store and preserve water well enough to stay “wet.” TL-DR: land animals are weird, not fish." ]
[ 25 ]
[ [] ]
[ "url" ]
[ "url" ]
gmy90l
if the brain doesn’t have pain receptors, what are headaches?
Biology
explainlikeimfive
[ "fr6g30v", "fr6qufa" ]
[ "Your brain doesn't have pain receptors but your head does, that's why it's a headache not a brain ache." ]
[ 16 ]
[ [], [] ]
[ "url" ]
[ "url" ]
infz0p
If the Pro grade mobile sector has better hardware than a nintendo switch or older consoles, why do mobile games still look so bad in comparison to graphics from 10 years ago?
Technology
explainlikeimfive
[ "g47cmf0" ]
[ "They dont put the money into developing a better game/wider audience aiming for people with lower end devices. Mobile games generally are something you play for a short time then get over, and no one is paying console prices for a mobile game. So they dont make as much initial money, so they dont spend as much on the game." ]
[ 3 ]
[ [] ]
[ "url" ]
[ "url" ]
crimtl
how would the ‘life is a simulation’ theory work?
Technology
explainlikeimfive
[ "ex5iqnd" ]
[ "There is a distinct possibility that the entire universe we perceive is actually a simulation in some great computer. Evidence to support this type of theory is often very philosophical; for instance, if we assume that people in every universe build computers that simulate smaller universes (take video games as a primitive example), then it logically follows that the majority of universes are simulated. If you think of every single universe we know of; ours, and every simulated universe from video games to physics simulations, 99.999% of those universes are simulated. Therefore, the only real assumption that this theory makes is that it is possible for a sufficiently large computer to simulate our universe." ]
[ 5 ]
[ [] ]
[ "url" ]
[ "url" ]
6n3239
Some people believe that we are currently living in a "late stage" capitalist society. What does it mean to be in the late stage of capitalism?
Economics
explainlikeimfive
[ "dk6dcaf", "dk6dn1h", "dk6emsj" ]
[ "Capitalism is supposed to benefit everyone, consumers and producers. Consumers get quality product through competition and availability. Producers get wealth through providing the best product at reasonable prices. The problem with capitalism, especially deregulated capitalism, is human greed. Throw enough money at beating your competition (advertisements, smear campaigns, hostile take-overs, non-compete markets, etc.) and monopolies are bound to arise. When companies grow so large that they dominate through sheer overwhelming numbers (think Walmart vs Mom & Pop), they tip the balance of consumer and producer towards the producers. When the giant companies have such leverage over pricing, wages, logistics, location, and product quality, they will inevitably exploit it for further profits. The purpose of producers is no longer to produce products for success through quality. It is now to provide profits for shareholders. The consumer is no longer part of the equation. We live in a mostly-post-scarcity environment. Products are now readily available. In America, at least, it's not difficult to walk down the street and buy a loaf of bread, some meat and cheese, and go home to feed your family. This is a positive end-goal of capitalism. \"Late stage\" capitalism, however, is what is happening on the consumer side of the consumer/producer equation. Producers have their end-game, they are making their profits and all is right in their world. Consumers, however, are **struggling to be able to buy from producers**. Wages have stagnated for decades. Education is both losing the value it once had AND becoming more expensive to attain. This is causing a problem of a lack of a skilled workforce AND a workforce incapable of readily buying the products they produce **for the producers**. /r/LateStageCapitalism can and does get extreme, but the entire purpose of the sub is to show the ridiculous point we are at in a capitalist society. People are literally starving in the streets while corporate executives have **multiple** yachts. Poor people are derided as lazy and moochers while lobbyists are convincing the government capital gains shouldn't be taxed as much. A high school graduate shoveling coal used to be able to buy a house; now, software engineers are sharing apartments. It is currently easier to turn $1mil into $10mil on the stock market without ever producing a single product, than it is to create a product that will sell enough to earn you $1mil. There is nothing left on the consumer/producer equation. When a corporation can sell you completely defective products and services (phones that explode, airlines giving seated passengers concussions, pharmaceutical companies selling highly addictive opioids, oil that comes from sponsors of state terrorism, cars that don't pass emissions tests, Big Box stores that pay their employees so little that they require food stamps *and then accept federal assistance from those food stamps*) and *those corporations don't go out of business*, the consumer/producer balance has failed. This is late stage capitalism." ]
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6bt4i1
Moore's Law - Does computing power really double every 18 months? Will this ever plateau out?
I started wondering why Hollywood is remaking so many movies from the 90s and even 2000s, and I self-concluded that I bet it's because there are much better CG effects, and they want to re-tell those popular stories with updated technology (even though we are only talking 10 to 20 years worth of time). Then I starting thinking, surely computing power must plateau out eventually, right? I mean, if computing power is always doubling extremely quickly, then won't this continue the trend of making hardware like cell phones, computers, TVs obsolete within a matter of weeks/months?
Technology
explainlikeimfive
[ "dhpbwlh", "dhpe7jk", "dhpl1j0" ]
[ "\"Moore's Law\" is actually just an observation of a historical trend - the *density of transistors* tends to grow exponentially, doubling every 18 months. This tends to translate to more transistors and, when coupled with improvements in clock speeds, lead to exponential increases in CPU power throughout the 80s, 90s & 2000s. Clock speeds, however, have largely plateaued. Intel was shipping 3.8GHz Pentium 4 CPUs back in 2005 - their fastest chip today is only clocked at 4.2GHz. This means that the last few generations of CPUs have not made significant improvements in processing power from one release to the next. When Intel released their most recent \"Kaby Lake\" processors, many people were *really* disappointed that it showed a minimal performance improvement over the previous \"Sky Lake\" release. For things like rendering CG for movies, the performance of CPUs isn't really such a limiting factor. With larger & larger budgets for CG and special effects, we just keep building larger render farms & throwing GPUs at the problem." ]
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