q_id
stringlengths
6
6
title
stringlengths
3
512
selftext
stringlengths
0
4.44k
category
stringclasses
12 values
subreddit
stringclasses
1 value
answers.a_id
sequencelengths
1
489
answers.text
sequencelengths
1
4
answers.score
sequencelengths
1
4
answers.text_urls
sequencelengths
1
489
title_urls
sequencelengths
1
1
selftext_urls
sequencelengths
1
1
5y0jju
What is happening when I change gears in my manual transmission?
Bonus for whoever explains what the differences in mechanics are for different types of transmissions.
Engineering
explainlikeimfive
[ "demboo2" ]
[ "The same that happens when you change gears in your bike, my dear 5 year old. You want to pedal a lot and not be tired or pedal a little and with all your strength, climb that hill. That's manual transmission. Automatic transmission makes the choice for you. The motor of the car is coupled to the wheels in such a way that it transmits the rotation of the motor to the rotation of the wheels. The rate at which this happens is the gear. Reverse adds a further cogwheel to the system so that the rotation of the motor gets transmitted backwards to the wheels. Manual transmission requires you to disengage the gear before engaging the next. That's what you do with the clutch. You \"disconnect\" the motor turning cogwheel from the wheel's turning cogwheel. Select appropriate cogwheel (gear) release the clutch so cogwheels are \"connected\" again and motor rotation is transmitted Automatic transmission forces the gears to slip to the next one whenever the motor reaches a certain number of rpm. In manual transmission you have full control of the motor. Look at this [diagram]( URL_0 ). The cogwheel from the engine is green." ]
[ 5 ]
[ [ "http://s.hswstatic.com/gif/transmission-5speed-gears.gif" ] ]
[ "url" ]
[ "url" ]
cgik8k
How do the different wireless networks do not collide with each other and decrease their intensity or increase it according to the case?
Technology
explainlikeimfive
[ "euhi82b", "euhnwjg" ]
[ "Actually they do collide. I'm case of WiFi in your house, it use 2,4 or 5 GHz signals. But it doesn't use exactly 2,4 or 5 GHz but rather a slightly different frequency, like 2,389 or 4,997. With that the network \"trys\" to avoid to use the exact same frequency as a near by network and to avoid on this way to \"collide\" with each other. There won't be a total signal loss if two networks send on the same frequency, but the packet loss and therefor the speed and reliability will suffer." ]
[ 3 ]
[ [], [] ]
[ "url" ]
[ "url" ]
kmxfxf
How does the akinator work?
Other
explainlikeimfive
[ "ghhbipx", "ghha0w2" ]
[ "You can design a very primitive Akinator of your own by just drawing a big tree-shaped flow chart on a piece of paper. First things first, come up with a question, any question. Let's say question #1 is \"is your character an adult?\" Write that down in the top flowchart bubble, then draw two lines coming down from there, one for \"yes\" and the other for \"no\". The first few times you play this game with someone, it will be very short and unimpressive. You'll say \"Is it an adult?\" And they say \"no\" and you say \"huh, I'm stumped. Who is it?\" And they'll say \"Dora the Explorer\", and then you write down \"Dora\" on your chart under the no. Then you play again with someone else. You ask \"adult?\" and they say \"yes\", and you see that you have no one written down on the \"yes\" branch of the tree. So you say \"I give up, who is it?\" And they say \"Superman\". So you write down Superman under the 'yes' branch. Now the next game is a bit more interesting, but still not so impressive. You ask \"Adult?\" and they say \"No.\" and then you follow the \"no\" line on your flowchart and find you've got a name there! So you say \"I know! It's Dora the explorer!\" and they say \"Nope, it's Timmy Turner.\" So you write down Timmy's name next to Dora's. Now, you have 2 names at the same node in your tree. That's a problem. So now you have to extend your tree. Ask the player: \"What's a question you could ask, where the answer would be yes for Timmy but no for Dora?\" Maybe then they say \"Is the character male?\" Write that down on that node of the tree, and put Dora and Timmy below it. So now, your updated tree looks like this: [ URL_0 ]( URL_0 ) If you keep doing this thousands and thousands of times, your flowchart will get bigger and bigger untill you start actually getting quite a lot of guesses right. You are basically letting your players do the work of teaching you what characters exist, and what questions you can ask to determine who they are. & #x200B; Now this is a pretty cut-down algorithm. The real Akinator has a little more complicated logic in it to account for the fact that not everyone answers the questions the same way, even when they're thinking of the same character." ]
[ 15 ]
[ [ "https://i.imgur.com/9zK2ZO8.png" ], [] ]
[ "url" ]
[ "url" ]
nw8ya1
Why do tires get more damage when accelerating fast then when going high speed for a long but controlled time (eg. 130km per hour on motorway)
Engineering
explainlikeimfive
[ "h17rufh" ]
[ "When your tires roll over the road, its more like pushing over and over again in terms of physics. In a short distance, high acceleration event, the asphalt beats your tires by ripping bits of it off. In a long distance, low acceleration event, your tires wear out considerably slower. Sort of like washing dishes with short fast strokes versus long slow wipes. The former is much better at tearing things up." ]
[ 4 ]
[ [] ]
[ "url" ]
[ "url" ]
cmaptb
How can a single port “understand” which function to perform based on what device was plugged into it?
I just messed up my old iphone earbuds that had a jack. I borrowed my dad’s, which were the latest ones, with the lightning ending. I plugged them into my iphone’s lightning port (which also has a jack) and they functioned properly. How does this work? Thanks in advance!
Technology
explainlikeimfive
[ "ew0yxj1" ]
[ "The port is nothing more than a specified way to transfer signals. I'm not familiar with lightning ports specifically but I'd assume it has a way to transfer power, and a way to transfer data. Every device that uses a lightning cable follows the same standards that the port has so it knows it gets power and data over specific parts of the cable. So when you plug a device in, every device works effectively the same way. It transfers data over the cable and the computer/phone/whatever that has the port is able to use the data it transfers to identify the device. Once it knows you have (for example) an audio device connected, it knows if it transfers audio signals to the device, the device is capable of using them properly." ]
[ 4 ]
[ [] ]
[ "url" ]
[ "url" ]
6lmx3w
Why do "slips" happen, where you're sure you said one thing but actually said another?
For example, I was having a conversation with a friend and said "Joe" instead of "Bob" even though I was *sure* I said Bob. Another time was when I ordered 6 piece chicken nuggets and I received 10 piece nuggets. I told my friend, hmm she messed up and gave me 10. He said "no you definitely said 10" but I was 100% positive I said 6. Why does this happen?
Other
explainlikeimfive
[ "djva4u0", "djvd09l" ]
[ "Same reason you could actually have ordered 6 nuggets and receive 10: somewhere in the late part of the chain of events, someone messed up. There're many areas of the brain involved in saying something. First you've got to have the thought of saying it, and then you've got to communicate it, and that last part is where something can go wrong. See [aphasia]( URL_0 ), a condition where patients can fully keep their cognitive abilities, and yet they'll say completely different words when verbalizing them, leaving them unable to communciate. And interistingly enough, aphasia also affects visual language, like sign language." ]
[ 10 ]
[ [ "https://en.wikipedia.org/wiki/Aphasia" ], [] ]
[ "url" ]
[ "url" ]
6hlw2y
Why are telecom lobbyists currently so much more successful than tech lobbyists?
Most people seem to take it as given that the telecom companies are the ones who pushed through the FCCs changes to Net Neutrality - given that major tech players (with combined, and sometimes even individual, market caps far greater than the major telecom players) are dead set against this, how did the telecom companies manage to get it through in the first place?
Technology
explainlikeimfive
[ "dizd5b3" ]
[ "Telecom is a regulated industry. Every company that is successful in that business is successful because they work within the rules and lobby to get the rules they want. They all have to work together because they are highly regulated. They have a common enemy, the consumer, and they have customer satisfaction ratings to prove it. Tech companies are much more competitive. They spend a lot of work beating each other in order to win the customer's money. Government has been hands-off in their business area so they haven't been involved in a lot of lobbying, which many of their founders consider \"cheating\"." ]
[ 8 ]
[ [] ]
[ "url" ]
[ "url" ]
6ptsv2
How does fostering kids work?
I always hear about how foster kids are sometimes abused and I want to know what the foster system works. Is it a job or do people get chosen like they do for jury duty? Is it volunteer work, and if so, why are there so many people volunteering to abuse these kids?
Other
explainlikeimfive
[ "dks55rn", "dksa7k5", "dks5dc9" ]
[ "You sign up. Social services does some routine investigations to qualify or disqualify you. Then then place a child with you...and you get a monthly stipend of $600-800/mo plus some amount of foodstamps to feed the kid. Theres a caseworker assigned to you that has waaay too many foster kids to pay proper attention to each case. When theres a complaint or problem they respond and evaluate whether there is an actionable issue or not. Abuse happens sure. BUT most foster parents take good care of the kids they foster. Most kids in foster care are a lot better off than they would be in group homes. Like anything you hear more about the failures and flaws than the success stories." ]
[ 19 ]
[ [], [], [] ]
[ "url" ]
[ "url" ]
5uxz50
How does cooking meat provide more energy?
Biology
explainlikeimfive
[ "ddxpocx", "ddxptnd" ]
[ "Cooking meat doesn't add more energy into the food - what it does (in simple terms) is make it easier for the body to get the energy out of the food. This essentially means that it takes less energy to digest the food so the overall energy gain is greater - it also makes the food more able to be digested completely meaning less energy is wasted by not being digested." ]
[ 7 ]
[ [], [] ]
[ "url" ]
[ "url" ]
de4zxs
Why do white dots appear sometimes on nails?
Biology
explainlikeimfive
[ "f2rxhbq" ]
[ "Leukonychia due to injuries or calcium or zinc deficiency, normally they are an indicator of health problems." ]
[ 3 ]
[ [] ]
[ "url" ]
[ "url" ]
k4vtls
How are people on prescription medications for depression, anxiety, ADHD etc allowed to drive when some one on non prescribed drugs like pot not allowed to drive?
Other
explainlikeimfive
[ "geb35fx", "geb33x0" ]
[ "The key is not whether the drug is prescription, but if it affects your reaction time. Pot makes you sluggish and fixate on irrelevant details, and both of those are bad when you're driving. ADHD medication makes people with ADHD able to concentrate and ignore distractions, which is generally helpful when you're trying to not crash a car." ]
[ 4 ]
[ [], [] ]
[ "url" ]
[ "url" ]
o21xo3
How does anything in space not just get destroyed by high speed objects accelerating through space? How can we have space stations that are not blasted with huge holes from impacts?
Engineering
explainlikeimfive
[ "h23xzo2", "h24111s", "h23yjsn", "h23ynvp" ]
[ "Space is empty. Really, space is really almost completely empty. There are things out there, damage has occurred, and maneuvers are made to avoid the big things that are being tracked. But mostly, space stations depend on space just being empty." ]
[ 26 ]
[ [], [], [], [] ]
[ "url" ]
[ "url" ]
lhbxwz
Why is light affected by gravity if photons are massless?
Physics
explainlikeimfive
[ "gmwedzq", "gmwfwyn" ]
[ "Gravity doesn't pull on mass. Gravity is a distortion in spacetime. Inertial matter (matter with no force acting on it), including matter in a gravity well, will follow straight lines through spacetime. However, a straight line through spacetime will 'curve' towards the massive object. Light is an extreme of this, moving at c, but it follows the curve just as well." ]
[ 76 ]
[ [], [] ]
[ "url" ]
[ "url" ]
c4cnl4
why doesn’t a dogs hair fall out during chemotherapy?
Basically the title. I’ve seen a few posts on reddit about wonderful puppers beating cancer after having so many weeks of chemotherapy. Why does human hair fall out leaving the patient bald but dogs tend to keep their hair when receiving the same treatment? Hope this makes sense!
Biology
explainlikeimfive
[ "erw87se" ]
[ "Pet chemotherapy does not use the same high dosage as in people. Pets with aggressive cancer often only will live months to 1-2 years (with a few exceptions, notably low grade B-cell lymphoma that respond well to treatment), so the expectation is not usually a cure/remission, but to provide as long quality of life as possible, which would not be the case if we hammered them like they do in people. However, pets still do get side effects of chemo drugs affecting their rapidly dividing cells, but is usually limited to temporary bone marrow suppression and GI signs (vomiting, diarrhea). People with cancer can live a long time if they reach remission, so they tend to be more aggressive, plus people understand the pro/con of the suffering and sickness of going through chemotherapy, making it worth it. MOST dogs do very well with chemotherapy, side effects wise." ]
[ 4 ]
[ [] ]
[ "url" ]
[ "url" ]
e5ucba
Hydrogen is the most abundant chemical in the universe, but we don't actually see it. How can people actually "gather" and store it and use as fuel?
Chemistry
explainlikeimfive
[ "f9m0nqk", "f9m05ff" ]
[ "Having the ability to see something is not a requirement for being able to store it or use it. I mean, we can't see helium but we can collect and store it. We can't see air but we can store it and separate it into its constituent gases. Most of the hydrogen we collect is as a byproduct of oil and natural gas extraction, but there are many other methods, like electrolysis of water for example. It's all just chemistry." ]
[ 10 ]
[ [], [] ]
[ "url" ]
[ "url" ]
fvcnlh
Why was our recent 'economic growth' just a bubble and not real growth of the economy?
Economics
explainlikeimfive
[ "fmhtqqr", "fmhsh2m", "fmhqdhr" ]
[ "Shutting down all workplaces for a month will trigger a recession and massive economic losses, even if it took place in the greatest economic time period in history. No economy is designed to be able to withstand a month of shutdowns. To say it happened because it was a bubble is false." ]
[ 5 ]
[ [], [], [] ]
[ "url" ]
[ "url" ]
6ehl9l
How did water appear on earth?
Hello, I am aware of the theory with asteroids and comets full of ice that crashed to earth, but i'm having trouble believing that all of the 326 million trillion gallons on the earth now is from just comets and asteroids. could there be another explanation? Thanks.
Other
explainlikeimfive
[ "diaj4ak" ]
[ "It's hard to imagine the timescale involved- While comets hit the earth much less often today, understand that there were millions of comets around in the beginning stages of the solar system. If you could have been around to see it happen you would witness a constant bombardment. Let that happen for 500 million years or so and we easily have a planet that is mostly water on the surface. Plus as has been said, there is evidence that much of the water was right with us from the start." ]
[ 3 ]
[ [] ]
[ "url" ]
[ "url" ]
6utf7z
How do music streaming services pay artists? How much are artists paid? What is payment based on (number of plays, etc)?
Other
explainlikeimfive
[ "dlva8zz" ]
[ "They know what people are playing and they compile costs based on play count and cut checks to the labels on a pre-determined basis. Sometimes rates are different based on quantity and such. It all differs, but most services pay standard rates that are set by law. Sometimes companies pay different rates depending on if they have a contract that gives the artist greater control of the streaming rights and sometimes they pay different rates for specific artists for things like exclusives. It depends on the situation, the song, and what agreements have been struck." ]
[ 20 ]
[ [] ]
[ "url" ]
[ "url" ]
mngv4g
190 degree sauna vs 190 degree hot tub
Explain it to me like I'm five. How can I sit in a 190 degree sauna for 20 minutes and be comfortable but any hot tub higher than 104 degrees is unsafe, 150 degree water leaves burns on your skin.
Biology
explainlikeimfive
[ "gtxds8w", "gtxf5ee" ]
[ "Heat transfers very quickly through *conduction*, which is when a hot thing is touching a cold thing and the heat flows into the cold thing through that touch. Gases aren't very dense and don't touch your skin nearly as much. Gases are very good insulators because of this. So even though the air is very hot, it's not touching you enough to transfer a lot of heat to you very quickly. Water, on the other hand, is way more dense and touches your skin *a lot* so it transfers heat *very* quickly to you." ]
[ 13 ]
[ [], [] ]
[ "url" ]
[ "url" ]
62dzby
Why can humans draw near-perfect curves without thinking in one stroke, but when trying to recreate it at a slower pace and while thinking about it, they cannot?
If you've ever quickly slashed your pen across a piece of paper, you may have found how easy it is to create a good looking curve in one stroke. But, if you try to recreate that in a slower fashion and while thinking about it, it will come out to be messy and not a curve at all. Why is that?
Other
explainlikeimfive
[ "dflr60d" ]
[ "Our muscles are all defined to work on impulses. Neurons send signals at a certain speed to get us to move a muscle. When you move your fingers slowly you're just sending multiple signals of \"move just a little\" not one signal of \"move slot very slowly.\" There's more in here about action potentials and thresholds but I'm not qualified to talk about that stuff." ]
[ 11 ]
[ [] ]
[ "url" ]
[ "url" ]
aaz2s7
How can PG & E (or any company) be charged with manslaughter/murder?
How can a corporation be charged with manslaughter? How are community service and other sentences served by an entire company? If found guilty for starting the CA fires, what happens to PG & E since no other competition exists for their services?
Other
explainlikeimfive
[ "ecwdiin", "ecw7g4x" ]
[ "To answer a little more specific from the perspective of a Californian and answering directly about PG & E: They’re simply going to have to pay a fine. Maybe someone higher up in the company gets a sentence. That’s really it. This isn’t the 1st, and it certainly won’t be the last, time that PG & E is responsible for a large issue in California. So long as they can put a $ value on it, the company will be fine. They’ll have their lawyers find ways to have to pay the $ back over a long period of time or find reduce the $ amount through a settlement." ]
[ 3 ]
[ [], [] ]
[ "url" ]
[ "url" ]
gnnu9m
- How would drinking deoxygenated water affect average human?
Biology
explainlikeimfive
[ "fravju5" ]
[ "It wouldn't. Deoxygenated water is just plain water without extra oxygen dissolved in it. If you were a fish you couldn't breathe it as you need that dissolved oxygen in it, but a human drinking it would be unaffected. Imagine it like a soda, it has carbon dioxide dissolved in it which becomes really apparent when you open it and some of that CO2 escapes. The same with water, it can trap plain O2 in it." ]
[ 16 ]
[ [] ]
[ "url" ]
[ "url" ]
a0l1ho
What is the difference between antibacterial soaps and regular soaps?
I've heard that antibacterial soaps aren't any different from regular soaps and don't get your hands any cleaner than a regular soap and regular soap is all you need to get your hands just as clean to get rid of germs and bacteria. Are antibacterial soaps for certain instances where people actually need it? (ie: doctors, nurses and surgeons) and handling raw food. Or is antibacterial soap just another marketing ploy to convince people into thinking the antibacterial soap is the better soap that does a better job of cleaning so that they buy it? Is there actually a main difference between antibacterial soap and regular soap?
Biology
explainlikeimfive
[ "eaignwg" ]
[ "Antibacterial soap doesn’t get your hands cleaner. It’s actually very bad to use and here’s why. It may kill some bacteria but those that survive are made stronger by it. Then they reproduce stronger bacteria. This is how antibiotic-resistant bacteria come to be. When antibiotics first came into use, people would stop taking them when they felt better. So instructions to take for 10 days (because it takes 10 days to kill them all) resulted in some surviving and reproducing bacteria unaffected by that antibiotic. Antibacterial soap will have the same results over time so it’s bad for the planet to use it plus unnecessary because your hands ARE NOT CLEANER" ]
[ 3 ]
[ [] ]
[ "url" ]
[ "url" ]
cp0hu7
If the peunut is not considered a nut, but a bean, then why people with nut allergies are also allergic to peanuts?
Biology
explainlikeimfive
[ "ewmdjcg", "ewmhihu", "ewmdhm6", "ewnkxsy", "ewmgj3b" ]
[ "They're not. Often people with peanut allergies are also allergic to soybeans, because both are legumes. However, they're not necessarily allergic to tree nuts such as almonds and walnuts. And vice versa - people who are allergic to tree nuts aren't necessarily allergic to peanuts. That's not to say that someone couldn't be allergic to both, but they're not related allergies. Edit to change the word \"typically\" to \"necessarily\" because although the two are unrelated, both are common." ]
[ 55 ]
[ [], [], [], [], [] ]
[ "url" ]
[ "url" ]
6g1nkh
how do loud snorers not wake themselves up?
Other
explainlikeimfive
[ "dimpeov", "dimpfln", "din0sb5" ]
[ "My husband wakes himself up snoring all the time. Either he startles himself awake or I kick him. Either way, once the snoring gets to a certain level, he will wake up." ]
[ 10 ]
[ [], [], [] ]
[ "url" ]
[ "url" ]
7oh3br
Why is carbon fibre so strong if just held together by resin?
I've never really understood how carbon fibre is so strong when it's primarily just held together with resin. Wouldn't it only be as strong as the resin is?
Engineering
explainlikeimfive
[ "ds9iyz0", "ds9h0bg" ]
[ "[This wiki link is a good place to start if you're curious about fibrous composites.]( URL_0 ) So \"carbon fiber\" the material has some incredibly high tensile strength to weight ratio. It's like a super rope material if you will... But like rope, it doesn't hold it's shape. You can weave the fiber into a shape you want, and then the matrix(resin/plastic) provides the stiffness. Then when there is a force in the direction the shape is designed for, the incredibly strong fibers take a lot of the stress. This means you can make it stronger and lighter. If you're doing a force the structure isn't made for, it can actually make it weaker - because the fiber isn't taking any stress in the direction and can actually cause a failure mode." ]
[ 13 ]
[ [ "https://en.wikipedia.org/wiki/Fibre-reinforced_plastic" ], [] ]
[ "url" ]
[ "url" ]
ijeyag
Are "meat sweats" a real thing? If so, why does eating meat promote sweating?
Biology
explainlikeimfive
[ "g3d8ei4" ]
[ "Meat is high in protein, and the human body has to work a lot harder to break down protein than other foods. That extra work creates heat and energy, and causes your body to sweat." ]
[ 8 ]
[ [] ]
[ "url" ]
[ "url" ]
9y4tqp
Carbs, protein, fats - in which order are these used by the body and why?
Biology
explainlikeimfive
[ "e9y9b59" ]
[ "Glucose is our staple energy source. If the body needs energy, glucose is broken down producing ATP and releasing CO2 and H20. If the body does not need energy, the glucose is built in to chains for easy storage in liver. These chain molecules are called glycogen. They are easily accessed and broken down to glucose whenever blood sugar levels decrease to provide the body with energy, During starvation, when there is no energy provided by food, the body has to break down it's 3 main energy stores - liver glycogen, body fat and muscle. Your body begins by breaking down the liver glycogen. Next is body fat and and if desperate - muscles. In terms of weight and total calorific content this comes to, for an exemplar 70kg male; about 0.2kg liver glycogen = ~800kcal, about 15kg triacylglycarides (TAGs = major component of body fat)= ~135,000kcal and 6kg muscle = ~24,000kcal. As you can see, body fat is the major energy store of the body. Fat cells exist partly to be used as an energy store. However, the body will break down glycogen first always as its simpler and more direct. Breaking down body fat (TAGs) for use as energy requires two more complex processes; 1) beta-oxidation of fatty acids to the natural precursor for a specific stage in the same natural metabolic pathway as glucose, and 2) gluconeogenesis, producing glucose from glycerol ( a non-carb source!). Muscles are the last to be broken down, for obvious reasons - we need them. Muscle breakdown doesn't only affect things like leg and arm muscles, but also things like cardiac and diaphragm muscle, so it is really a last attempt for the body to survive by breaking these down. This would probably be around a couple weeks in to starvation and death would soon follow." ]
[ 14 ]
[ [] ]
[ "url" ]
[ "url" ]
alby6r
Why can't a country in a trade surplus be sustained in that position indefinitely?
Economics
explainlikeimfive
[ "efcn16a" ]
[ "It can. Imagine you have a job at a convenience store where they give you a 50% discount on baseball cards. You don’t care for them much, but your friend does. He regularly buys them from you for 90% of list. You never buy anything from him. Your friend has a trade deficit with you. The trade, though, is beneficial for both of you and you’ll keep doing it as long as it works out for both of you. And you’re not living outside your means to do it. Your teacher may have been talking about a budget deficit, which is a whole different thing. That is living outside your means. *edit: I had the trade deficit backwards. Macro at 7am never safe." ]
[ 7 ]
[ [] ]
[ "url" ]
[ "url" ]
jgh4sa
Why do handwashing stations have "Do Not Drink" labels on them?
Most hand washing stations do not reuse water, and have separate containers for clean and used water. Why can't I drink it?
Other
explainlikeimfive
[ "g9qfejw", "g9qkn5u" ]
[ "They probably can't be sure that the water tanks are clean, especially if the station has been in place for weeks and weeks. They don't want to be liable if the water has cooties in it and gets somebody sick. It's like the water at campsites - they try to make sure it's good enough to drink, but they can't guarantee it, so they recommend you not drink it. (Then if you do, not really their fault.)" ]
[ 10 ]
[ [], [ "https://en.m.wikipedia.org/wiki/Drinking_water" ] ]
[ "url" ]
[ "url" ]
6ld6qe
How Do Singers Sing Without Sneezing/Coughing/etc?
Basically the title, but when I sing in the car/shower, etc. (Amateur, obviously), I often will have a sudden sneeze, or need to cough, or my throat will dry out, or have some other bodily distraction. I often wonder how a singer can play through a song (Live or otherwise) without such issues. I mean, I can't recall a single concert where the singer suddenly coughed mid-line or mid-song. Only thing I can think of is if those shows being cancelled due to illness were over minor things like a cold or coughing fits. And I get that practice is part of it, I'm just wondering what they might be practicing.
Other
explainlikeimfive
[ "djt12ou", "djtbd0o" ]
[ "They do it a whole ton. That and they keep themselves pretty healthy and don’t over perform to get themselves sick or injured. Most people aren’t trained in how to properly sing and control things like breathing and sustaining your voice. Singers know how to do that and don’t expend all of their energy like you do. Plus singing in the shower and on stage are miles apart. You cannot compare the two." ]
[ 3 ]
[ [], [] ]
[ "url" ]
[ "url" ]
6h27yq
What is the smallest known uncontacted ethnic group?
NOTE: When I mean uncontacted, I mean "Very little touch with modern society", NOT "Undiscovered"
Culture
explainlikeimfive
[ "diuwpe1", "diuz95n", "diuyoqc" ]
[ "Several candidates. There is island inhabitants of Niihau in Hawaii, Population 100 or something. There is various Amazonian tribes, usually only a village worth or so. Small, you mean population?" ]
[ 13 ]
[ [], [], [ "https://en.wikipedia.org/wiki/North_Sentinel_Island" ] ]
[ "url" ]
[ "url" ]
9jd86j
How do we know which colors different animals see?
Also, would we know if a specific animal had color blindness?
Biology
explainlikeimfive
[ "e6qg64g" ]
[ "Dissect their eyes to see the actual color detecting cells and test what light they respond to. The cone cells have specific proteins tasked with reacting to specific wavelength bands of light, you can expose those proteins to light in the lab and monitor their activity. Since all animals are at least loosely related, there are only a few variants of these color detection structures and it's pretty easy to see which ones are present and which are missing." ]
[ 23 ]
[ [] ]
[ "url" ]
[ "url" ]
cgqc5r
If I buy a 5 kwh solar system and the efficency of the panel is 20% do I only get 1khw?
Engineering
explainlikeimfive
[ "eujq2m1" ]
[ "A 5kW panel will generate up to 5kW of electricity. Due to the sun rising and setting and the weather, you’ll only average about a seventh of that, even if the panels are ideally positioned. So 5kW times 24 hours divided by 7 gives around 17kWh per day, on average. In the summer it could be more than double and in winter less than half; much depends on the climate where you live, orientation of the panels, and any shading from things like trees and houses." ]
[ 5 ]
[ [] ]
[ "url" ]
[ "url" ]
i81y4o
If the colour we see is the one that was not absorbed, but reflected, by the object in question, what causes this specific colour not to be absorbed? Is it chemical or physical?
Physics
explainlikeimfive
[ "g15j84h", "g15mlr9" ]
[ "It can be either or both. After all, chemicals are physical things. Heating iron up in a furnace would make it turn red. And so would painting it red." ]
[ 5 ]
[ [], [ "https://1.bp.blogspot.com/-vdkyEnhh3f4/VhwXseFSoTI/AAAAAAAAAII/TPPnHCrfYHw/s1600/shells_and_orbitals.png" ] ]
[ "url" ]
[ "url" ]
9i9lkc
When you receive a local anaesthetic, although you don’t feel pain, why do you still feel pressure? Also, why does that area sometimes feel big or heavy (for example your lip when you get local anaesthetic for dentistry)
Biology
explainlikeimfive
[ "e6hy0tk", "e6hy75m", "e6imd9r", "e6i45gg", "e6igv9g", "e6j4pr9", "e6iu4gz", "e6idogw", "e6idi6h" ]
[ "This is a good example of how we really have more \"senses\" than can fit into the usual five. Think about a finger. It can tell you all kinds of stuff: Hot/cold, rough/smooth/sharp/dull, vibrations, pressure, pain, and even where it is in space. (A good neurologic exam can look at all these separately.) They're often a bit different in the way they're sensed and how that information is passed along, which means drugs may hit them differently: \"Local anesthetics have greater affinity for receptors within sodium channels during their activated and inactivated states than when they are in their resting states.1,2 Therefore, neural fibers having more rapid firing rates are most susceptible to local anesthetic action. Also, smaller fibers are generally more susceptible, because a given volume of local anesthetic solution can more readily block the requisite number of sodium channels for impulse transmission to be entirely interrupted. For these reasons the tiny, rapid-firing autonomic fibers are most sensitive, followed by sensory fibers and finally somatic motor fibers... The dentist is generally spared this consideration because the trigeminal nerve branches anesthetized for dental procedures are comprised only of small, rapid-firing sensory fibers. However, the many classes of sensory fibers also vary in their diameters and firing rates. For example, pain fibers are more sensitive than those carrying pressure and proprioception. A patient may remain disturbed by a sense of pressure despite complete anesthesia of pain fibers.\" ( URL_0 ) **ELI5: To shut someone up by throwing a sock in their mouth, their mouth has to be open. A pain nerve is like five people who are always chattering, so throwing five socks will shut most of them up. A pressure nerve is like ten people who only talk when it's important, so even ten socks may bounce off.**" ]
[ 4795 ]
[ [ "https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3403589/" ], [], [], [], [], [], [], [], [] ]
[ "url" ]
[ "url" ]
747nwi
Why do cops in movies and TV shows taste the cocaine before saying something like "take him away" or "jackpot"? Isn't ingesting coke dangerous, and illegal?
Other
explainlikeimfive
[ "dnw30tr", "dnw4wmh" ]
[ "Maybe in the 80s they taste tested it... its cooler in the movies then busting out a testing kit and going csi on it It tastes chemically...then numbness and thats how you know its not powdered sugar. The amount being consumed in a touch'n'taste is too little for any significant effect beyond local numbing. Insufflation not only involves a larger dosage but also provides a more conducive path of absorption." ]
[ 9 ]
[ [], [] ]
[ "url" ]
[ "url" ]
beyo5h
Why is underwater welding so dangerous?
I've always heard that underwater welding is one of the most dangerous jobs anyone can undertake, hence the big pay check. Can anyone explain why?
Engineering
explainlikeimfive
[ "el9qcj1", "el9gkva", "el9xdhq" ]
[ "Technical diving is extremely complicated, and there are a lot of risk factors. Decompression sickness and narcosis will both kill you real dead if you aren't extremely careful about monitoring your depth, time, and the amount of gas you're breathing. Any strenuous physical activity will make both of those problems worse. Now add to all the normal diving problems that you have to drag a welding unit with you, and that you're going to be diving around heavy machinery and in areas that potentially have huge pressure gradients (dams, pipelines, water towers, pump stations, etc), and that you'll be doing it all in less than ideal conditions most of the time (cold water, low visibility, strong current, rough seas, etc). It's a tough job that requires mastery of two quite hard to master skillsets." ]
[ 13 ]
[ [], [], [] ]
[ "url" ]
[ "url" ]
7rdssy
Why Do Old CRT TVs Make A High Pitched Hissing Noise?
Technology
explainlikeimfive
[ "dsw53lr" ]
[ "The noise was usually attributed to the fly back transformer that was used to generate high voltages for the crt tube. Transformers generate an alternating magnetic flux that would separate the laminations in to core and cause them to vibrate with the alternating current." ]
[ 19 ]
[ [] ]
[ "url" ]
[ "url" ]
c31nre
Why does beer get a 'head' when it is poured, whilst other fizzy drinks such as cider and soda do not?
Chemistry
explainlikeimfive
[ "ero2ywh" ]
[ "The foam on beer is stable because of the proteins in it, so the bubbles break less easily and a head can form. Fizzy drinks like soda contain much less protein so the bubbles formed are less stable, pop more easily, and are therefore much harder to foam." ]
[ 11 ]
[ [] ]
[ "url" ]
[ "url" ]
5yln4d
Will oil ever be obsolete?
Other
explainlikeimfive
[ "der1fui", "der240g", "der0e88", "derbn88", "der03ut", "der6kfv", "derbo1h", "dermr68" ]
[ "Oil is used to produce some 70,000 different chemicals and synthetic materials, so until we find a way to produce each of those things without oil, then it will never be obsolete. We're not talking about silly things either, oil is an essential material for making plastic, nylon, and a thousand other synthetic fibers. Basically, if you wear any clothing not homemade, use a computer, drive a car, or use... anything these days, then you need oil. If it's not made out of metal, wood, or 100% cotton, it's got a little oil in it somewhere." ]
[ 478 ]
[ [], [], [], [ "https://en.wikipedia.org/wiki/Thermal_depolymerization" ], [ "https://en.wikipedia.org/wiki/Petrochemical", "https://en.wikipedia.org/wiki/Petroleum_product" ], [], [], [] ]
[ "url" ]
[ "url" ]
5orooc
Why are younger children so picky about the foods that they eat?
Biology
explainlikeimfive
[ "dcln0iv", "dcljb5k", "dcljloo", "dclyoig", "dcln72r" ]
[ "I remember having a course on evolution and behaviors where we were taught that children are picky with vegetables because in nature, a lot of plants are toxic and children tend to avoid them, especially since children are more fragile in case of an eventual poisoning. Moreover, a lot of green vegetables have a bitter taste and this tends to be an indication of toxicity in plants. As adults, we lose our sensitivity and therefore our aversion for bitterness, and we just learn what is safe or not to eat. Add to that some other factors, like cultural aspects (advertising for instance, fastfood restaurants), or the fact that humans have a natural tendency to favor energy-rich food (for evolutionary reasons that are not really \"useful\" anymore when you live in a developed country)." ]
[ 26 ]
[ [], [], [], [], [] ]
[ "url" ]
[ "url" ]
7vrc8q
How come the lobe of the brain controlling vision is in the back?
I am studying brain anatomy right now in anatomy and cases like this keep popping up. Is there a simple explanation?
Biology
explainlikeimfive
[ "dtui8hw" ]
[ "It just is. It's not a satisfying answer, but it's the right one. It might seem logical that the visual cortex would be as close to the eyes as possible, but if there was an evolutionary disadvantage to having the visual cortex at the back of the brain instead of near the eyes, it wouldn't be that way. The fact that the visual cortex is where it is shows that there's no disadvantage to having it in the back of the brain. In addition, it is not the case that fibers are not \"just\" running from the eyes all the way back to the visual cortex - there are additional targets for the signals from the retina besides the visual cortex. And even for signals that end up a the visual cortex, there is quite a bit of processing that happens along they way in other parts of the brain before reaching the visual cortex." ]
[ 6 ]
[ [] ]
[ "url" ]
[ "url" ]
krigm7
What is electromagnetic radiation?
Physics
explainlikeimfive
[ "gia3ng3", "gia3db2" ]
[ "Two hundred years or so ago, James Clark Maxwell was coming up with a bunch of equations to describe how electricity and magnetism are related. During this, he came to a rather bizarre conclusion. He realized that magnetic and electric fields could actually self-perpetuate; they could sustain themselves without a nearby magnet or electric device. They could propagate as a wave, with no need for nearby wires or magnets. He also concluded that, in air, these waves would travel at 299,700,000 meters per second. This is electromagnetic radiation - an alternating magnetic and electric field traveling independently of a wire or magnet. Being a wave, this electromagnetic radiation can have frequency. When experiments showed that visible light also travels at this speed of maxwell's waves, it began to seem as if light was also this electromagnetic radiation, but at a much higher frequency (more waves per second). This is indeed the case." ]
[ 7 ]
[ [], [] ]
[ "url" ]
[ "url" ]
a475ki
Why do American's often reference constitutional amendments and not the actual constitution?
Other
explainlikeimfive
[ "ebc1xb1", "ebc2lko", "ebc237k", "ebc28p8" ]
[ "Amendments are exactly that. They were items not in the original wording of the Constitution but the country thought them important enough that they were amended to be a part of the Constitution." ]
[ 15 ]
[ [], [], [], [] ]
[ "url" ]
[ "url" ]
b0sdmk
What is the practical use of the stapler setting that makes the staple prongs go outwards instead of inwards?
Other
explainlikeimfive
[ "eigv9qw" ]
[ "the correct answer is that the outward setting makes the papers easier to pull apart than the inward setting. it's a temporary attachment rather than a permanent one" ]
[ 42 ]
[ [] ]
[ "url" ]
[ "url" ]
lt1hs5
Why you feel sometimes being drunk after just one beer and sometimes you feel sober after half the bottle of alcohol?
Biology
explainlikeimfive
[ "goujw31" ]
[ "How drunk you are depends mainly on two things. How quickly and how much your drink, and what else is in your body when you drink. If I skip breakfast and lunch and then chug two beers for dinner, I’ll probably get pretty drunk pretty quickly. But if I have a large meal, and then drink half a bottle of vodka over the next 4 hours, it will take a lot longer for me to get drunk, and I won’t get as drunk as if I hadn’t eaten." ]
[ 21 ]
[ [] ]
[ "url" ]
[ "url" ]
7q5krh
What is the GDP
Even with all the research online, I can’t warp my head around what the GDP really is.
Economics
explainlikeimfive
[ "dsmih8n", "dsmia4d", "dsn5jvs" ]
[ "GDP is gross domestic product, a measurement of the total value of goods and services produced by a country in a given year. Every t-shirt, car, Apple, candlestick, massage, medical treatment... Every thing people in a country buy or service people pay for. This measures roughly the economic output generated by that country over the course of time. It's one of many measurements used to reflect what is going on in an economy. More useful is GDP per capita, which is simply the GDP divided by the number if people living in the country. So a country with a high GDP but also a high population such as China would have a lower GDP/cap than the United States which has a higher GDP and a lower population." ]
[ 11 ]
[ [], [], [ "https://www.reddit.com/r/explainlikeimfive/comments/5iuevf/eli5_difference_between_real_gdp_and_nominal_gdp/", "https://www.reddit.com/r/explainlikeimfive/comments/2m8aua/eli5_how_is_gdp_measured_and_how_accurate_is_it/", "https://www.reddit.com/r/explainlikeimfive/comments/266ubh/eli5_what_is_gdp/", "https://www.reddit.com/r/explainlikeimfive/comments/2y3s0y/eli5_what_is_gdp/", "https://www.reddit.com/r/explainlikeimfive/comments/vqcfw/eli5_what_is_gross_domestic_product_gdp/", "https://www.reddit.com/r/explainlikeimfive/comments/qaeys/can_someone_explain_what_gdp_is_like_im_five/", "https://www.reddit.com/r/explainlikeimfive/comments/ju714/eli5_what_does_gdp_really_mean_and_how_is_it/" ] ]
[ "url" ]
[ "url" ]
dea6g0
Are are zoo animal births less successful than in their natural habitats? If so... Why?
Biology
explainlikeimfive
[ "f2tszrh" ]
[ "Zoo animals births are 1000x more successful than in the wild. Zoos aren't just a place for entertainment. It a rehabilitation center focusing on saving species. If an animal is born in a zoo there's a WHOLE medical staff ready to jump in if there's any signs of distress or issues. The baby then gets checked their shots and reintroduce to their mother and monitored closely by the staff. To ensure its health They don't have that in the wild. Especially predators. Ready to kill the newborn." ]
[ 9 ]
[ [] ]
[ "url" ]
[ "url" ]
6eqnr7
When I'm driving through a tunnel (specifically underwater) I lose radio reception but I still have cell reception (i.e. Streaming music)?
Technology
explainlikeimfive
[ "dic9orp", "dicbdcj" ]
[ "This can happen when cellular access points have been added to the tunnel. The tunnel still shields out external signals, but it has interior signals all of its own." ]
[ 6 ]
[ [], [] ]
[ "url" ]
[ "url" ]
8w6rio
What causes “wet” and dry sounding flatulence?
Biology
explainlikeimfive
[ "e1t759x", "e1t6ajd" ]
[ "By design our noses work best when warm and damp conditions are present. A shower has those conditions pretty prevalently supplied. The warmth and humidity causes the molecules causing the smell to stick better to the scent receptors in your nose." ]
[ 9 ]
[ [], [] ]
[ "url" ]
[ "url" ]
ide59b
Musicians sue each other due to copyright all the time. So why, for example, in modern Latin pop music, can different artists use the same (or nearly the same) drum beat/rhythm/tempo across many songs and not face lawsuits?
Other
explainlikeimfive
[ "g28cgdj", "g28e3rp", "g28cjei" ]
[ "Copyright is tricky. You have to determine what is copyright-able when it comes to a song. Example, a few months ago, Katy Perry lost a copyright suit when a christian rapper said that the 8 tones used in a part of her song was similar to an 8 tone sequence in his song (they weren't the same notes, they were similar, but with the same rhythm). A month later, Led Zeppelin successfully defended a lawsuit regarding a small part of Stairway to Heaven, where the judge said that the portion being contested was too small to be copyrightable. This led to a reversal of the Katy Perry lawsuit. If you want an analysis from youtube copyright/trademark lawyers on the Katy Perry case (I watch Leonard French all the time). [ URL_0 ]( URL_0 )" ]
[ 13 ]
[ [ "https://youtu.be/Ay5jCi77wP4" ], [], [] ]
[ "url" ]
[ "url" ]
jiyvl1
How does Bluetooth get in sync with videos and sound even though Bluetooth has quite a big delay?
Technology
explainlikeimfive
[ "ga9f5wp", "ga9l6uy" ]
[ "Cache. If/when you're streaming over bluetooth it's not in real time. It's delayed just enough to copy enough of the file to the display device so that the program can be relatively confident it will play without errors. With proper transfer speeds and compression, the delay can be almost imperceptible to the viewer, but in computer timing small portions of a second can be more than enough time to \"stockpile\" enough data to present it smoothly **grammar and spelling*" ]
[ 15 ]
[ [], [ "https://www.headphonesty.com/2020/07/fix-sound-delay-bluetooth-headphones/#:\\~:text=In%20a%20wireless%20connection%2C%20Bluetooth,audio%20signal%20to%20the%20receiver", "https://www.headphonesty.com/2020/07/fix-sound-delay-bluetooth-headphones/#:~:text=In%20a%20wireless%20connection%2C%20Bluetooth,audio%20signal%20to%20the%20receiver", "https://support.biamp.com/Tesira/Video/Video_and_network_latency#:~:text=In%20general%2C%20the%20audio%20can,and%20distracting%20for%20most%20people", "https://support.biamp.com/Tesira/Video/Video\\_and\\_network\\_latency#:\\~:text=In%20general%2C%20the%20audio%20can,and%20distracting%20for%20most%20people" ] ]
[ "url" ]
[ "url" ]
91wkw1
how do artillerymen know how to dish out accurate counter artillery fire? How do they figure out where the hostile fire is coming from?
Mathematics
explainlikeimfive
[ "e31ajr6", "e31i2ak", "e31hzbo" ]
[ "Counter-battery radar. The radar detects and tracks artillery shells and rockets, and a computer then locates the enemy battery by tracing the projectile's path back to its source. Before radar artillery directors used sound, intelligence reports, aerial surveillance, and reports from scouts to locate enemy guns." ]
[ 15 ]
[ [], [], [] ]
[ "url" ]
[ "url" ]
6r51qd
Why is that for some people drinking coffee makes them wide awake for quite some time but for others it makes them tired?
I finished my coffee about 15 minutes ago and I feel more exhausted now than before I drank it. This happens every time I drink coffee.
Biology
explainlikeimfive
[ "dl2erzy", "dl2zqza" ]
[ "The caffeine in coffee stimulates neurotransmitters that have to do with alrtness. It is possible to overstimulate and drain these neurotransmitters. So if you are drinking lots of coffee and energy drinks, that can happen. Also for some people who have very \"hyper\" or \"scattered\" or \"trouble focusing\" brains (aka ADD) the stimulus from caffeine can actually help the \"focus\" of the brain, and it is very relaxing and even restful." ]
[ 10 ]
[ [], [] ]
[ "url" ]
[ "url" ]
7wvd2d
What does it mean when "your brain releases chemicals"?
Biology
explainlikeimfive
[ "du3kp5t" ]
[ "The brain is made up of [several parts]( URL_2 ) and -just like any other complex structure, there's a lot of stimulus reception, chemical signaling and biochemical responses going on. For communication to happen between different cells/tissues/organs/systems, complex chemical interactions have to happen, when people say \"your brain releases chemicals\", they're talking about (a) hormones which are regulated by the [brain glands]( URL_1 ), and (b) neurotransmitters, which are mostly [electrochemically charged biomolecules]( URL_0 ). Those molecules serve as a signal to certain stimuli, when stimuli A happens, a signal is sent to the brain and the brain releases chemical B as a response. All those complex chemical interactions are what -to some extent- keep organisms living. Currently we don't know the refined details but we're getting closer each day!" ]
[ 3 ]
[ [ "https://en.wikipedia.org/wiki/Neurotransmitter#Types", "https://upload.wikimedia.org/wikipedia/commons/6/6b/Illu_pituitary_pineal_glands.jpg", "https://qph.ec.quoracdn.net/main-qimg-edeb18e045879eb6b129e28ab3199c50-c" ] ]
[ "url" ]
[ "url" ]
93ksvo
If microorganisms can live in brackish/ocean water, why does salt work so well as a food preservative?
Salt preserves food because microorganisms can't grow and spoil it and cause illness, right? But some can grow in salty conditions, so why is this not a problem?
Biology
explainlikeimfive
[ "e3e21sl" ]
[ "What matters to microorganisms is something called water availability: basically, are the surroundings moist enough that water goes into the cell, or do they suck water _out_ of the cell. When you pack foods in salt (And they literally pack food in a mass of salt) then the salt draws the water out of the food through osmosis and out of any bacteria as well, making it impossible for them to grow. Salt-preserved food typically is exposed to much higher salt levels than sea water, for example one might use a pickling brine of 10%, compared to 3.5% salt for sea water. Or just stick food straight into a barrel of salt." ]
[ 9 ]
[ [] ]
[ "url" ]
[ "url" ]
9awnhq
How does electricity work?
Physics
explainlikeimfive
[ "e4yoccf", "e4ypmn5" ]
[ "I'm still a student in EE but I will try to answer your question. Electricity is a form of energy, energy created by the movement of electrons. In physic, both for newtonian and quantum, there are energy levels. This levels are also called as potential. Every particle in the univers want to be the lowest possible energy level/potential. This is called stability. For example; visible light is simply an excess energy comes from an electron moving from high potential to low potential. Remember this information. Imagina a circuit. It is just a battery connected to it's own poles with a conductor, lets say a wire. When you connect batteries minus polar and plus polar, you create a potential difference. This potential difference causes electrons to move, as expected, tolowest point. When an electron moves, lets assume clockwise direction, it creates an imaginary particle which is called \"hole\". This particles, holes, sre what we call as electricity. So you can say that, when an electron is moving it creates electric on the opposite direction. Hope this will help you." ]
[ 4 ]
[ [], [] ]
[ "url" ]
[ "url" ]
b0jer4
what does "power cycling" a modem actually do? Why is it always 10-15 minutes?
Technology
explainlikeimfive
[ "eif0kos" ]
[ "Part of is resetting the modem, and part of it is resetting the connection. Resetting the modem is obvious - it's a computer, and sometimes computers have bugs which corrupt a portion of memory. Turning them off and on restores the defaults. Resetting the connection is a bit more complex. The ISP maintains some amount of state for your modem - it knows the modem's IP address (which is assigned dynamically when you connect), and each side has some information remembering agreed-upon details for the connection. Sometimes, one side or both screw up the connection state, and in this case the connection must be torn down. The longer gap is to make sure this reliably happens on your ISP's side, instead of the ISP's side just deciding that the connection is slow for a bit. [This page]( URL_0 ) has a bit more technical information." ]
[ 5 ]
[ [ "https://blog.pilotfiber.com/why-your-isp-tells-you-to-reboot-your-modem" ] ]
[ "url" ]
[ "url" ]
fexn3g
how are gymnastics bars so flexible without breaking or cracking under all that weight?
Engineering
explainlikeimfive
[ "fjt1c1l" ]
[ "Gymnastic bars are made out of fiberglass and given a wooden coating. Fiberglass is, by design, an incredibly flexible material. And that as well a sproper trianing allows them to bend without breaking when used by gymnasts. But by no means are they invinsible, they can break it's just rare. Like with pole vault shafts" ]
[ 5 ]
[ [] ]
[ "url" ]
[ "url" ]
guql35
Why do you still feel like you're in the waves after swimming?
When you've been swimming for a long time and you come home and lay down, why does it still feel like you're in the waves?
Biology
explainlikeimfive
[ "fsk0ahu", "fsk0d4k" ]
[ "Your inner ear structures are still moving around and/or activated and irritated inside your head. These structures are responsible for balance. While you were swimming, you were off balance and your inner ear was reacting to that. You leave the water, and it's still in a state of reaction. The same thing happens when ride a bunch of roller-coasters at an amusement park and then go home for the day. Whoo, feeling loopy." ]
[ 3 ]
[ [], [] ]
[ "url" ]
[ "url" ]
aljkzj
Why would Homo sapiens ever migrate north into colder climate?
Other
explainlikeimfive
[ "efeitxf", "efeixkt", "efepesm" ]
[ "Well, back when we were migratory creatures, we wouldn't. Head north during the warner months and south fir the cooler months. But once we decided that settling down was better. The amount of fertile land and other natural resources was tempting enough for the settlers to brave a few cold months." ]
[ 12 ]
[ [], [], [] ]
[ "url" ]
[ "url" ]
c1buz1
How big is the internet? Can it be define in GB or TB?
Technology
explainlikeimfive
[ "erc5nvj", "erc5u50", "ercb02c", "erc9yws" ]
[ "Bigger. It's on the order of 1000 of petabytes. And growing. A petabyte is 1000x terabyte" ]
[ 23 ]
[ [], [ "https://www.internetlivestats.com/" ], [ "https://en.wikipedia.org/wiki/Zettabyte" ], [] ]
[ "url" ]
[ "url" ]
62d6lq
why is the ¢50 dollar coin so uncommon?
Economics
explainlikeimfive
[ "dflkwz4" ]
[ "People are not using the low value coins. The reason the US Mint stopped making them were that their warehouse were filled. They also stopped production of the $1 coin in 1981 for the same reason until 1999 when the stocks became low enough to start production again. US Mint make coins and notes for banks and big businesses. Fresh coins are ordered by businesses to fill their till to make sure they have enough coins for change. However if people do not want the $.50 coin in change there is no need for businesses to restock their supply." ]
[ 5 ]
[ [] ]
[ "url" ]
[ "url" ]
gjpbhq
Why do plants make fruits?
from what side is it beneficial for the plant to produce fruits?
Biology
explainlikeimfive
[ "fqm79mw", "fqmdssp" ]
[ "It helps them geographically spread out their seeds. Animals eat the fruit and carry the seeds elsewhere. This functions as an alternative to relying on the wind to spread seeds." ]
[ 9 ]
[ [], [] ]
[ "url" ]
[ "url" ]
dzpknb
why would higher oxygen levels make prehistoric animals bigger?
So I googled why prehistoric animals were bigger and it suggested that the higher oxygen levels could be why. But why would more oxygen make animals bigger ?
Biology
explainlikeimfive
[ "f89g534", "f89aca3", "f89aqf5" ]
[ "The premise of your question is flawed. Prehistoric animals weren't bigger than our modern animals. The largest animal to ever exist is the blue whale, which only evolved reletively recently. Many of the large land mammals comparable in size to dinosaurs only died out very very recently (in the last 100,000 years or so). This has an assignable cause that has nothing to do with atmospheric oxygen. It was us. The onset of humans caused mass extinction of large mammals wherever we went. As for the dinosaurs, remember that larrge animals are easier to find in archeological digs than small ones, so we discover disproportionately higher numbers of them than small animals, leading to the incorrect assumption that there were a lot for of them. Also keep in mind that the scale of prehistoric time is very very long. A lot of those animals you think of that existed \"back then\" like in the age of the dinosaurs, did not exist at the same time period as each other. There were few mega fauna roaming the world at any one time, not many. However, insect size is highly dependant on atmospheric oxygen, since they don't breathe with lungs or gills. They absorb oxygen directly from the air into their blood. Therefore, the size they can reach while still being able to get enough oxygen to function is highly dependent on the concentration of oxygen. This means that insects were larger due to higher levels of oxygen." ]
[ 5 ]
[ [], [], [] ]
[ "url" ]
[ "url" ]
fys44x
why is burnout tyre smoke white, but when you burn a tyre on a fire the smoke is black?
Threw a tyre on a bonfire last night which gave off thick black smoke and beggd this question? Why do burnouts give off white smoke but a tyre on fire burns black?
Chemistry
explainlikeimfive
[ "fn1lr92", "fn1k6p8", "fn1myxx" ]
[ "Black smoke is soot - carbon dust, full of all the toxic stuff in tires. White smoke isn't smoke. It's a cloud of vapor. That friction doesn't create a fire. It doesn't start a combustion reaction. Instead, it superheated and instantly boils certain chemicals and oils in the rubber, which then immediately disperse into the air, and condense into tons of tiny droplets of liquid. That cloud is white because it's just like clouds in the sky, just made of the volatile chemicals and oils in the rubber, rather than water." ]
[ 18 ]
[ [], [], [] ]
[ "url" ]
[ "url" ]
6oo7pe
From where do animals know which plant to eat when they feel sick?
Biology
explainlikeimfive
[ "dkj1we4" ]
[ "As an additional similar question, how did natives figure out if you mix one inactive plant (with DMT) with another inactive plant (an MAOI), together they create ayahuasca? Neither plant alone is effective and there are millions of options for deadly trial and error in the rainforest." ]
[ 5 ]
[ [] ]
[ "url" ]
[ "url" ]
8aim19
Why do hours pass by like minutes when you’re laying in bed after waking up?
Biology
explainlikeimfive
[ "dwzc6gi", "dwzc6p1", "dwzc4oh", "dwzce5h", "dwzc4ol", "dwzd05z" ]
[ "This is an interesting phenomenon. Time of course continues to pass at the normal pace while we sleep, but our perception of time is temporarily suspended. This can be attributed to the altered state of consciousness associated with sleep. We are kept unaware of our surroundings, which would certainly make it difficult to remain informed of the passing of time. When we awaken in the morning, we have the memory of going to bed the night before, but new memories are rarely made while we sleep. Therefore, upon waking up the following morning it feels as if no time has passed, but our minds reason that many hours have elapsed simply because it is now light outside, and perhaps your bedside alarm clock is telling you that it is morning. TLDR: you don’t have a reference point of time because you’re asleep and you have to “make” new memories as you awaken. Source: URL_0 Phil Salant" ]
[ 302 ]
[ [ "quora.com" ], [], [], [], [], [] ]
[ "url" ]
[ "url" ]
nd4pwq
Why is "number" shortened to "No." or "No"?
Other
explainlikeimfive
[ "gy8lj40", "gy8lyoh", "gy8mki2" ]
[ "It's a short form of the Latin \"numero\" which is what \"number\" is derived from. Numero is used in French, Spanish, and Italian." ]
[ 19 ]
[ [], [ "https://en.wikipedia.org/wiki/Numero_sig" ], [] ]
[ "url" ]
[ "url" ]
98ru51
Today, most households cannot afford to have a permanent stay at home parent. How did this change happen, when it was the norm just a few decades ago?
Economics
explainlikeimfive
[ "e4ins68", "e4i9xpy", "e4ir991", "e4iikal", "e4i9p6g", "e4ikmfj", "e4iutlc", "e4ijuog", "e4ivrew" ]
[ "Basically what happened is that the cost of living, especially rent and home prices, escalated dramatically, but wages did not keep pace. Here's a real-life example: In the old days, when I got married, my ex and I were both making $5 an hour. The minimum wage was abut $2.75 an hour then. Neither of us had degrees of any kind. We were able to get FT jobs out of high school, none of that trying to piece together a living wage from three-PT jobs stuff so many high school grads do now. We could find a 1-bedroom apartment in a decent but not glamorous area for $500 a month. So together, we made $400 a week gross and were only spending 31% of our gross income on rent. This low proportion of rent-to-income allowed us to be able to stay out of credit card debt. We were able to live on a cash basis for a pretty long time. My ex had a skill he used on weekends and by using that skill and selling the work from it, we were able to save up for the down payment on a house. Only needed 3% because of FHA loans. My ex's pay eventually got doubled to $10 an hour and by then we had a child, so we were still living in a $500 a month unit, on the same pay, but now with a baby. My body made the baby's food for the first 6 months, and I even used cloth diapers because disposables were so expensive. We had a washer in the garage and bought a used dryer. I took in ironing to make a few extra dollars, and also made dolls to sell when hand-made dolls were all the rage. I also did some sewing for a friend of the family who was very large and wanted dresses made out of 100% cotton. (Those are hard to find for big ladies, even today.) Eventually my ex got a decent raise and was earning enough to be considered lower middle class. I stayed home with the kids. But the thing that REALLY gave us the leg-up in life was that we weren't paying 50% or more for f-ing rent, and we didn't have to get a credit card to buy food and clothes. We had enough extra cash every month to pay two car payments and buy the needs of life. We did not get into trouble with credit card debt, something I see so many kids in their 20s do now, because we could afford to live on a cash basis. It wasn't easy - especially after we had the first child - but I shopped for used stuff at thrift stores, bought at the Big Box stores, etc. The other thing that was not all that unusual back then was that we could both find jobs that paid almost double minimum wage without any degree at all. We started out adult life at a relatively high wage. There are some trades that still pay that well, but I worked for a family-owned retailer. NO ONE pays retail cashiers or clerks without even an AA degree double minimum wage now - unless it's a legal pot shop in California, I guess. And, if they did, that means in California I'd be paid $22 an hour as a cashier in my county. (Minimum wage is now $10.50 hr. here.) Hell, I'll be a career cashier right now for $22 an hour. This is why, when I talk about the economy, I try to tell people how it was in the old days - the 60s, 70s and early 80s. Then Reagan and the GOP got elected and Robber Baron economic theories took over the country. *NONE* of those GOP theories have been proven to work to lift up the poor, but the theories exist nonetheless. \"Trickle down economics\" - let the rich get richer and it will \"trickle down\" to the poor. **That's a lie.** So, we were lucky to get the jobs we got, but we were also entering young adulthood in pre-Reagan times. We had an economy designed to help us, not hurt us. Today, young adults have an economy mostly designed to HURT THEM. They SHOULD be marching in the streets in rage and running for office. More power to them." ]
[ 57 ]
[ [], [], [], [ "https://kingofkash.com/blog/cost-cooking-meals-vs-eating/", "https://smartasset.com/personal-finance/the-average-cost-of-an-american-commute" ], [], [], [], [], [] ]
[ "url" ]
[ "url" ]
9udl2n
We have an air drying unit attached to our air compressor at our shop. The pipes bringing air in air normal. The pipes bringing air out of the unit are rusted, what causes this? Shouldn’t it be reversed?
Technology
explainlikeimfive
[ "e93eyz6", "e93hnk7" ]
[ "When you compress air, you take a large volume of air and make it smaller. That small volume of air still has the same amount of water in it as when it started. When it cools, that water will condense and settle out The air dryer is used to get most of the water out of the air but it doesn't get it all. If your pipes are setup right then all the water should funnel back to a single point, but if they aren't then over time you'll end up with water sitting in the pipes and rusting them out. Consider how many cubic feet of air you use and how humid normal air is. If it only gets 99.99% of the water from the air that can still leave a sizable amount of water behind in industrial applications" ]
[ 6 ]
[ [], [] ]
[ "url" ]
[ "url" ]
k6ke2y
how are royalty payments maintained across decades and multiple generations?
Economics
explainlikeimfive
[ "gelbvwf", "gelblyx" ]
[ "There are companies like BMI, ASCAP, etc. that specifically handle the licensing of music. The collect fees from places playing music like restaurants and then pay it to the artist or their estate." ]
[ 3 ]
[ [], [] ]
[ "url" ]
[ "url" ]
ig15mh
Why does the government seem to always go first to Education for cuts instead of other sectors?
Economics
explainlikeimfive
[ "g2qyu7s" ]
[ "Education doesn't bring immediate results. If you cut funding to roads, or police, or fire fighters, you immediately see the downside. The roads fall apart. Crime rises. Homes burn down. But if you cut education, it's a lot harder to see the problems that will happen when those kids grow up. It's thus easier to say \"Oh, they'll be fine.\" and not realize that in the long run, cutting funding for education is really bad for society." ]
[ 4 ]
[ [] ]
[ "url" ]
[ "url" ]
ltbuyv
how do UV shielding windows work?
Physics
explainlikeimfive
[ "gox563s" ]
[ "Normal glass (used in windows and such) is not transparent to UV light. It mostly absorbs the wavelength,(it reflects some), the same way say asphalt absorbs almost all wavelength or your blue T-shirt absorbing all wavelength but blue. Absorbed photons transfer energy to the material (usually electrons) and turns into heat." ]
[ 3 ]
[ [] ]
[ "url" ]
[ "url" ]
8ol7sb
Why do our brains like to synchronize certain repetitive actions?
For example, the old trick of drawing a circle clockwise with your right hand, while trying to draw a counterclockwise circle with your left leg. The hard part is trying to do this, as naturally you want to have both motions going the same rate and the same direction. What about the brain is it that makes tasks like these so difficult?
Biology
explainlikeimfive
[ "e046eys" ]
[ "I studied brain science in university. This is actually not your brain but your spinal cord. It contains hardware connections between your various limbs that help them stay perfectly in sync (like for jumping) or perfectly opposite sync (like for running)." ]
[ 11 ]
[ [] ]
[ "url" ]
[ "url" ]
a5ez7b
Why does water make extremely hot/spicy/burning in the mouth worsen, and why does milk seem to instantly make it go away?
Chemistry
explainlikeimfive
[ "ebm2zj4", "ebm3c36" ]
[ "The capsaicin that causes the hot feeling is an oil, and because oil and water dont mix, the water just spreads the oil around. Milk is basic, while capsaicin is acidic, and when you mix these two together, they become neutral, which is why milk makes the hot go away" ]
[ 10 ]
[ [], [] ]
[ "url" ]
[ "url" ]
j80t64
How is it that bugs can sleep vertically or upside down on a wall? Do they not feel the need to lay down in different positions as humans do?
Looking at a bug on my wall while I’m very comfortable (horizontally) ok my bed. And was wondering how the big be completely comfortable to sleep while hanging vertically on a wall? Does it not feel the same urge to lay down and stretch? Does it not need to focus on clinging to the wall so can not truly switch off and go to sleep? I’m aware than bugs and humans are extremely different anatomically, we can’t stick to walls being one thing... but just wondered how they can relax like that! Also, slightly drunk. Sorry for the ramble.
Other
explainlikeimfive
[ "g884hmh" ]
[ "* Humans *could* feel comfortable in the same position as the fly...if we had evolved that way. * But we didn't. * So the muscles that help move our blood through our blood vessels work way better in one direction than the other. * The fly didn't evolve this way so, no-problem-o." ]
[ 3 ]
[ [] ]
[ "url" ]
[ "url" ]
9yb4hl
Do animals in the wild not suffer from tooth and gum problems? Do they have any mechanisms to clean their teeth?
Biology
explainlikeimfive
[ "ea04a10" ]
[ "Short answer from an amateur, lots of animals (i.e. Rodents, sharks, others) never stop growing their teeth and thus just either break off decaying parts or replace them entirely. Another factor here is we humans have extended our life spans FAR beyond our natural evolution, our teeth were never designed to last this long and we have had to compensate for that." ]
[ 5 ]
[ [] ]
[ "url" ]
[ "url" ]
9x6iow
when polishing or sanding why do you start from corse and work down to fine?
I've watched a few videos where people are making something extremely smooth or shinny and notices they always change sandpaper grit and I started to wonder why is this needed. Can't you just use a fine grit for the whole process?
Technology
explainlikeimfive
[ "e9pxb32", "e9pxbb6", "e9q14bh", "e9qd79k", "e9pxeqk" ]
[ "Your working out the deepest scratches as quickly as possible. If you start with a grit more fine than the deepest scratch it will take longer to remove the metal down to the depth you need." ]
[ 20 ]
[ [], [], [], [], [] ]
[ "url" ]
[ "url" ]
8ydie2
Why does natural peanut butter (no sugar or oil) still taste sweeter than raw peanuts
Is this just something I’ve made up in my head?
Chemistry
explainlikeimfive
[ "e2aeczm" ]
[ "Although the starch molecule is a chain of hundreds of glucose molecules, it doesn't activate your sweetness taste receptors like individual glucose can. The beginning of your digestive tract is not the stomach, but the mouth. Like your stomach, your saliva contains enzymes (amylase) which break down complex carbohydrates (starches) in to simple sugars (glucose). The harder it is for the amylase to access the starch, the longer it takes to start breaking it down to glucose. Pulverizing starch containing food allows your amylase to start breaking down the starch far more quickly and as a result will produce larger quantities of glucose which will taste sweeter. If you ever start lightly chewing on a piece of uncooked dry pasta, it will take several minutes but eventually you will taste sweetness." ]
[ 3 ]
[ [] ]
[ "url" ]
[ "url" ]
5nzmk5
What is the difference between a poison, a toxin, and a venom?
Biology
explainlikeimfive
[ "dcfgc39", "dcfgp6q", "dcfgbjt" ]
[ "Poison is something that is harmful if ingested, venom is something that is harmful when injected by an animal through a bite or sting, and a toxin is usually a harmful byproduct of some other process." ]
[ 6 ]
[ [], [], [] ]
[ "url" ]
[ "url" ]
l1oruc
Why are so many movies filmed in New York?
Other
explainlikeimfive
[ "gk0qbs8", "gk0of5q" ]
[ "They're not! While there are a handful that are filmed in NYC, most movies and shows that are set in New York are filmed in Vancouver, Toronto, or Atlanta, where they can get a similar feel but save a lot of money from tax breaks designed to bring production and filming to those cities. Some more artful productions like Mr. Robot are filmed on location as a matter of principle. If your question is why so many movies are *set* in New York, it's because it's such a recognizable setting (self fulfilling prophecy, I know), with a wide diversity of different options for a wide diversity of different lifestyles." ]
[ 15 ]
[ [], [] ]
[ "url" ]
[ "url" ]
c0jb1k
How does a Nintendo 3DS produce its 3d effect?
Technology
explainlikeimfive
[ "er4zo39", "er51hfk" ]
[ "It has two screens on top of one another and the light projects at different angles to trick your eye into believing it’s 3D. If you move the 3DS too far to one side, the effect will disappear." ]
[ 18 ]
[ [], [] ]
[ "url" ]
[ "url" ]
5m43bf
What are each programming language's real-world function?
Why use Java over C# or C++ in a specific scenario? This applies to even Python and Pascal as well Edit 1: I understand how software works and how a language is a different way to communicate to the computer. I understand that you can connect software languages to real-world languages (i.e. Grammar = Syntax) But I am wanting to know - during *insert problem here*, why should I use *insert language here* Why use one over another?
Technology
explainlikeimfive
[ "dc0ocmb", "dc0zd5o" ]
[ "Programming languages are like real-life languages. There are times one may be easier to communicate in - like speaking French when you're in France - but for the most part they all communicate the same things. If you want to program a sensor to detect when you press a button on a remote and then do something, you'll probably have an easier time in C since it was designed to keep stuff like that simple. But if you don't know C, you can still use Java or C# or whatever you do know, it will just be expressed differently. So really, they all serve the same function to communicate what you want to do to the processor. The only things that change are how that's expressed and how familiar you are with how to express it." ]
[ 8 ]
[ [], [] ]
[ "url" ]
[ "url" ]
g5mqku
How are video cameras and equipment not seen when the film/show features a character looking right at the mirror?
Other
explainlikeimfive
[ "fo49tur", "fo4au4w" ]
[ "Cameras can be hidden in various ways but the most common method is to film at an angle where it is just out of frame. Obviously if the actor was exactly straight on to their reflection then the camera would need to be right behind their head. Another way is to just have no mirror at all and film through a frame that looks like a mirror." ]
[ 20 ]
[ [], [ "https://www.youtube.com/watch?v=Ec1zr7xVNes", "https://www.youtube.com/watch?v=Fxa3j8bK-c4" ] ]
[ "url" ]
[ "url" ]
67hlsa
How does my car passenger know to wake up when we're 2 minutes from home after a 2-3 hour drive?
Biology
explainlikeimfive
[ "dgqfbyl" ]
[ "you're getting off the highway and making sharper turns and stopping at stoplights. whereas highway is constant speed and slow turns." ]
[ 4 ]
[ [] ]
[ "url" ]
[ "url" ]
5rfqmf
why were people bled in the past in hopes to get cured?
Culture
explainlikeimfive
[ "dd6uelp" ]
[ "The general idea stemed from Ancient Greek concepts of medicine called \"Humorism\". In their model all sickness was caused by imbalances in the four distinct fluids: Black bile, yellow bile, phlegm, and blood. Such ideas make some sort of intuitive sense in that if someone becomes sick they produce an overabundance of phlegm and if someone loses too much blood such as through a wound they will die. Otherwise of course it is complete nonsense, but what people were trying to do with the bleeding is to bring the four into balance. Unfortunately you might identify a fever as a sign of excess blood (blood being associated with hotness due to flushing from exertion, etc) and then decide to bleed someone simply because they have an infection causing fever. Not a great plan!" ]
[ 14 ]
[ [] ]
[ "url" ]
[ "url" ]
8pxsu6
How do officials come up with dead/injured/missing counts in massive disasters?
I.e., nightclub fire, 9/11, Hurricane Katrina. Mass death with little to no identification of bodies. How do they find out who's really missing and who just ran home or fled the scene?
Other
explainlikeimfive
[ "e0evei6" ]
[ "Generally speaking, people who go missing will be reported as such, say by family or coworkers. Beyond identification of the bodies themselves." ]
[ 5 ]
[ [] ]
[ "url" ]
[ "url" ]
5xl6qx
Exactly how does an MRI work?
Technology
explainlikeimfive
[ "dej0tly" ]
[ "Your body has 7*10^27 hrdrogen atoms which are spinning on their axes that are all pointing in random directions. When you are placed in a MRI machine, the magnetic field aligns a small majority of those atoms' axes with the direction of the magnetic field. Then, using three big electromagnets called gradients, it slightly alters the rotation speed and phase of these atoms (the gradients pulsing are what creates the loud noises you hear during a scan). It then pulses RF energy causing the atoms aligned with the field to flip 90 degrees so they are perpendicular to the field and are in a high energy state. As the atoms relax and realign with the main magnetic field, they release the energy they gained from the RF pulse. The MRI machine picks up this energy and can pinpoint the locations of the atoms, due to them spinning at different speeds and phases, and reconstructs an image of the tissues in which the hydrogen atoms reside. This is a very basic explanation of the physics involved. For a more in depth explanation, although still fairly basic, check out this awesome youtube video I watched when I first started working with MRI machines. [MRI: Basic Physics & a Brief History]( URL_0 )" ]
[ 4 ]
[ [ "https://youtu.be/djAxjtN_7VE" ] ]
[ "url" ]
[ "url" ]
bt6l0f
Why is our hearing dampened while yawning?
Biology
explainlikeimfive
[ "eoui96c", "eouxbyk" ]
[ "Yawning opens an air canal that pumps air into your ear from inside. (Sneezing, blowing nose, etc does that also). Changed pressure makes it harder to hear, because ears aren't as sensitive to vibrations due this. Sort of like banging a drum (or any similar surface, really) sounds duller if you press your other palm against it, to block or dampen drum skin from vibrating as much as it normally does. Or for example, try to bang the drum underwater. Ears are all about pressure." ]
[ 15 ]
[ [], [] ]
[ "url" ]
[ "url" ]
aiqmgy
If ice forms on your property, does that mean that you own that ice? Or the same with snow?
Other
explainlikeimfive
[ "eeppsab", "eeppmdb" ]
[ "It depends. It might belong to you, unless you live in a regulated water rights district. In Arizona, Colorado, Oklahoma and Utah; the default is that the government owns precipitation, even on your property. In general, these water rights owners are not responsible for damage done by their water on your property, so it's strictly lose-lose for you." ]
[ 14 ]
[ [], [] ]
[ "url" ]
[ "url" ]
kzz8vu
what’s the window of opportunity to save someone from a brain aneurysm?
It doesn’t seem immediate, but isn’t it still very fast? Dr Dre just survived one but I remember Grant Imahara didn’t
Biology
explainlikeimfive
[ "gjr0s1p" ]
[ "I don't know the specifics on Dr. Dre's aneurysm but in general an aneurysm isn't life threatening until it bursts or starts leaking. At that point a lot depends on the severity of the bleed and how quickly the patient gets proper medical treatment. My uncle had a ruptured aneurysm in his brain (this was a couple decades ago) and from what I've been told it was relatively minor. He has zero lingering symptoms after healing from the surgery to repair it. A family friend had one a couple years ago and despite being on the grounds of what is apparently one of the best facilities for this in the western US when it struck (she was a medical sales rep and was just finishing up a sales call). She was effectively dead within minutes of the onset of symptoms (she was on life support for about a week but the prognosis from the get go was that she would almost certainly never recover).." ]
[ 3 ]
[ [] ]
[ "url" ]
[ "url" ]
8a8ra2
How can turtles eat food underwater without swallowing too much water?
I was thinking how if I tried to eat something underwater, I would have a real difficult time. I would probably have Water end up in my lungs.
Biology
explainlikeimfive
[ "dwx0zh7", "dwwpqgy", "dwx0yse", "dwx5dtv", "dwx0t67", "dwwxrjz", "dwx69gt", "dwx2f2c", "dwx58vz", "dwx7p1v", "dwxppi4" ]
[ "Aquatic turtles DO swallow water when they eat, and actually can't swallow *without* water as they do not produce saliva. But they have a specially evolved esophagus that acts as a sort of pre-stomach. They fill the esophagus with food and water, and then constrict it to expel all the water while keeping the food inside. The food and a small amount of water then enter the stomach. Edit: Three years on reddit and I finally got gilded while I was asleep, and for something turtle related :D. Obligatory \"Thank you kind stranger\", and \"this blew up\". Seriously though, thank you. Volunteer to be the one who protec." ]
[ 5006 ]
[ [], [], [], [], [], [], [], [], [], [], [] ]
[ "url" ]
[ "url" ]
9tu0ml
Why does hot water feel like cold water at first?
Biology
explainlikeimfive
[ "e8z35pa", "e8z4cal", "e8z753k", "e8zfe63", "e8z7yd4", "e8za3pf", "e8z9hr4", "e8z3uul", "e8zo719", "e8zd0e8" ]
[ "It’s sensory overload. Your body has independent receptors for hot and cold; but occasionally when you trigger them with too hot of a source, both hot and cold will react. The term for it is paradoxical cold." ]
[ 3557 ]
[ [], [], [], [], [], [], [], [], [], [] ]
[ "url" ]
[ "url" ]
5yw8vf
What are Cankersores and why do they hurt so badly?
Biology
explainlikeimfive
[ "detdgw1" ]
[ "canker sores are ulcers - sores where the surface tissue over an area has disintegrated, leaving an open wound that heals slowly. It hurts because its an open wound that heals slowly in a part of the body that moves a huge amount and is unavoidably exposed to food and drinks, which irritates them and makes it hurt more." ]
[ 48 ]
[ [] ]
[ "url" ]
[ "url" ]
9mnakq
If cells store their own copy of DNA, how does gene editing work? Wouldn't you have to change all of them?
Biology
explainlikeimfive
[ "e7fvuks", "e7fvwjv", "e7fwig7" ]
[ "Basically, yeah. That’s why it’s not more commonly practiced, theoretically you could edit the genes of an embryo before it’s too far along. At least that’s how my chemistry teacher responded when I asked him this." ]
[ 8 ]
[ [], [], [] ]
[ "url" ]
[ "url" ]
9mblmu
Why is an i5 processor faster than an i3 processor if they have similar clock speeds?
Technology
explainlikeimfive
[ "e7disrz", "e7di23u", "e7di3u0" ]
[ "Multicore can theoretically improve performance. In practice, it does not because scheduling multiple cores is a nearly intractable problem on a general purpose O/S. If you look at the CPU time on your multicore processor, you'll notice almost all the work is being done by a single processor. Multithreading is a much more significant element. What multithreading allows you to do is have multiple threads ready and when one thread stalls, the other can consume CPU time that would otherwise be wasted. Caching is even more significant. The reason those threads get stalled is largely due to 'cache misses'. The memory in your L1 cache is hundreds of times faster to access than your main memory. As a result, any time a program requires a read from main memory, you're left with your CPU idling for hundreds of cycles. Better cache performance and techniques like multithreading (above) and branch prediction can prevent this. Specialized sub-processors also help a great deal. Unlike multiple generic processors, sub-processors solve the scheduling problem by forcing the software to run on certain, specific processors - processors optimized for those sort of problems. Vector processors for graphics are the most common example, but floating point math processors predate them. In the future, you might see even more of these sub-processors to deal with other common, time-consuming tasks. Smaller footprint and more efficient instruction sets can also make processors faster. It may seem like electricity moves pretty fast, but saving a few millimeters here or there makes a huge difference when you're talking about gigahertz speeds. Lower power can also help. A major limitation of modern processors is heat. Lower the power and you lower the heat. Unfortunately, you also increase the interference - which can be addressed by better channel coding (within limits)." ]
[ 6 ]
[ [], [], [] ]
[ "url" ]
[ "url" ]
cyjfkw
Why is it considered healthy to eat a mango, even though it has twice the sugar content of a 12 oz can of Pepsi?
Biology
explainlikeimfive
[ "eysc9xw", "eyscd7e", "eyscdrs" ]
[ "Fiber. Pepsi won’t help digestion. Not to mention the damage that can be done to your teeth." ]
[ 11 ]
[ [], [], [] ]
[ "url" ]
[ "url" ]
gjoksu
Whats the difference between a wifi router, a router and a modem?
Technology
explainlikeimfive
[ "fqm3si5" ]
[ "A router is a device that lets you connect several devices in a local network. A wireless router is the same thing, except that the devices connect to it worelessly (although it usually contains a couple of ethernet ports). A modem is what connects you to the internet. Some modems also functions as routers, so you don't need two separate devices. What you want is a wifi extender." ]
[ 4 ]
[ [] ]
[ "url" ]
[ "url" ]