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6mq8eo
The conflict in Northern Ireland.
I understand there's been a long conflict between the Protestants and the Catholics, but why has it been going on for so long and why is it so violent?
Culture
explainlikeimfive
[ "dk3idyz", "dk3oqgf" ]
[ "Irish Catholics (republicans) traditionally don't want to be British or part of the UK. Irish Protestants (loyalists) Want Ireland in the union. We at present have \"2 Ireland's\" Not a united Ireland, because the island of Ireland is split in two. The [ROI]( URL_1 ) and [NI]( URL_0 ) Basically way back when, before the empire was on the up and up we wanted to control the whole of the British isles. The English decided after some failed military occupations to do a sort of reverse insurgency where they paid folks (English protestants) to move to Ireland, gave them land and set them up. So now we have a \"native\" population that wants to remain, and a native pop that wants us to feck off. That's essentially the religion and the age/length of the issue, as for the violence, well they literally had a few wars over it. The last \"war\" being the war of independence, but there have been conflicts and such since. > The Irish War of Independence (Irish: Cogadh na Saoirse)[4] or Anglo-Irish War or the Tan War was a guerrilla war fought from 1919 to 1921 between the Irish Republican Army (IRA, the army of the Irish Republic) and the British security forces in Ireland. It was an escalation of the Irish revolutionary period into armed conflict. This resulted in the creation of the Irish free state, that being the current ROI not including Northern Ireland, hence why there is still an issue for a united Ireland free from British rule. * **If I'm wrong, oversimplified things or just being stupid let me know but this was just a quick ELI5 to the best extent of what I know**" ]
[ 3 ]
[ [ "https://en.wikipedia.org/wiki/Northern_Ireland", "https://en.wikipedia.org/wiki/Republic_of_Ireland" ], [] ]
[ "url" ]
[ "url" ]
izuvty
Why do people get “hangry”?
Even when I don’t feel consciously hungry, I get really bitchy when I haven’t eaten. Why?
Biology
explainlikeimfive
[ "g6l80st" ]
[ "When you haven't eaten lately, your blood sugar level falls. When your blood sugar is low, your body wants something to replace its usual fuel. Adrenalin is that substitute -- your body incentivizes anger which produces adrenaline which keeps you going until you can get some food. That's why those candy bar commercials center on \"you're not yourself when you're hangry\" -- a state instantly fixable with sugar." ]
[ 11 ]
[ [] ]
[ "url" ]
[ "url" ]
iz7xhk
Why do sunbeds tan the stomach very easily but hardly the hands/feet?
Biology
explainlikeimfive
[ "g6hha63" ]
[ "Our hands and feet have thicker skin because they make regular contact with surfaces. UV rays take longer to penetrate the thicker skin to activate the melanin." ]
[ 7 ]
[ [] ]
[ "url" ]
[ "url" ]
8s1y8p
why so many banks have the name "First National Bank of ..." in the title.
Other
explainlikeimfive
[ "e0vy2i0", "e0w4776" ]
[ "A national bank has a national charter, as opposed to a state charter. Hence there are lots of first national banks of ( name your state, city, county, etc.)." ]
[ 10 ]
[ [], [] ]
[ "url" ]
[ "url" ]
9dvpv7
What's the role of protein?
Biology
explainlikeimfive
[ "e5kbo2b" ]
[ "Your body is made of stuff that you eat. Most of the stuff you eat is just food that you burn up. But protein is special. Your body has parts of it that need to do things, like move, or break up your food, or do the burning of your food. The little machines that do those things - make your muscles shorter so they pull, break your food into little food pieces that your blood can carry, or burn your food up for energy - are made out of protein, from the food you ate! Protein is really good at being turned into machines. It's kind of like metal in a sense: it's easy to shape, and the shapes you can make with it do lots of stuff really well. You can make a gear, you can make a knife, or you can make a little engine all out of metal. Just so, you can make a protein that gets shorter when you want it to - get enough of these in a line and you have a muscle. You can make a protein that chops up food into little bits, and you can have a protein that burns food so you can use the energy. If you want to build muscle, you're gonna need a lot of proteins that pull, and a lot of proteins that burn food. To make those proteins, you need to eat protein* so you can take it apart and put it back together in the new shapes you need. \\* You can make some kinds yourself but some you have to eat Edit: formatting" ]
[ 19 ]
[ [] ]
[ "url" ]
[ "url" ]
jr7vqe
- why do we “hear” memories when we aren’t actually hearing them?
Other
explainlikeimfive
[ "gbrlz28" ]
[ "Science doesnt fully understand this either which is super cool. However, one likely explanation is that your actually remembering the sensation if hearing during a specific memory, rather than hearing a memory. Inner voices, audiatory memory, memory in general is one of the most awesome topics in psychology and neuroscience and should be discussed more. Thank you for an awesome question." ]
[ 4 ]
[ [] ]
[ "url" ]
[ "url" ]
anb1gr
Why is ‘utopia’ preceded by ‘a’ instead of ‘an’ ?
for instance, 'i tried to build a utopia'
Other
explainlikeimfive
[ "efs1wy2", "efs1luf" ]
[ "Despite starting with a vowel, Utopia, Utensil, and Ukulele, all start with a consonant (y) sound unlike umpire or underwear. The rule has more to do with speech sounding consistent than making sense on paper." ]
[ 24 ]
[ [], [] ]
[ "url" ]
[ "url" ]
btbk74
Why should I shop local?
Economics
explainlikeimfive
[ "eovlb3d", "eovldot", "eovl6b1" ]
[ "The more you buy from Amazon, the richer Jeff Bezos gets, and the more Sam from Sam’s Hardware can’t afford to feed his daughter. Sam is your neighbor. Take care of Sam." ]
[ 6 ]
[ [], [], [] ]
[ "url" ]
[ "url" ]
7qshmr
Out of order processing and Tomasulo's algorithm
Engineering
explainlikeimfive
[ "dss4fm0", "dsrta0r", "dss3beq", "dss6xgw" ]
[ "I'm going to explain this how I would explain it to an actual 5 year old. This will be at a very different level than the other answers, but maybe it will help some things click for you. Consider making dinner at your house. Someone gave you instructions to follow so that the dinner gets made correctly. You are going to make a spaghetti sandwich. 1. Boil water 2. Add pasta to water 3. Boil pasta for 10 minutes 4. Drain water from pasta 5. Add sauce to pasta 6. Pre-heat oven to 400 degrees 7. Put bread in oven 8. Bake bread for 5 minutes 9. Remove bread from oven 10. Turn off oven 11. Slice bread 12. Put pasta between bread slices 13. Eat Now, you could follow the instructions exactly as written and make a delicious spaghetti sandwich. However, you would be wasting time. There is no reason to wait for the pasta to cook before you start the oven. As written, it will take 10+5=15 minutes to make this meal. If you cooked the pasta and bread at the same time, you could make the meal in 10 minutes. You do this by executing the same steps in this new order: 6. Pre-heat oven to 400 degrees 1. Boil water 7. Put bread in oven 2. Add pasta to water 3. Boil pasta for 10 minutes 8. Bake bread for 5 minutes 9. Remove bread from oven 10. Turn off oven 11. Slice bread 4. Drain water from pasta 5. Add sauce to pasta 12. Put pasta between bread slices 13. Eat This is out-of-order execution. It is the processor figuring out that some of these steps aren't dependent on each other, so you can do them in a different order to get things done faster. This is possible because the resources you need to make the pasta (stove) and the resources you need to make the bread (oven) are different. Tomasulo's algorithm is a way of keeping track of which things are dependent on each other, and what resources are free, at any given point in time to get things done as quickly as possible." ]
[ 458 ]
[ [], [ "https://courses.cs.washington.edu/courses/csep548/06au/lectures/tomasulo.pdf", "https://en.wikipedia.org/wiki/Register_renaming", "https://en.wikipedia.org/wiki/Tomasulo_algorithm" ], [], [] ]
[ "url" ]
[ "url" ]
fykrfi
What are those "puddles of sunlight" you see when driving, and how do they work?
Other
explainlikeimfive
[ "fn0gcx3" ]
[ "If you are referring to this illusion that the road is somewhat wet in the distance, it is a phenomenon you know as a 'mirage'. The layer of air that is close to the ground is hotter than the air above because the road warms it. And hot air is harder for light to go through; therefore light rays are not straight when they approach the ground, but rather curve upwards. Thus, there are zones in your field of vision where those curved rays _seem_ to come from the road, but actually come from above (the sky or the far horizon). You see the sky on the ground: your brain interprets it as \"there is water\"." ]
[ 6 ]
[ [] ]
[ "url" ]
[ "url" ]
908u5v
Why are items such as Trousers and Glasses classed as a pair?
They are clearly one object, yet it is linguistically treated as if it were two. Here are two examples ; * "Your glasses look great. They are amazing." **Not "It is amazing"*** * "Your trousers are amazing. They are cool."
Other
explainlikeimfive
[ "e2opwto", "e2oljgn", "e2op9u9" ]
[ "For pants: Pants were originally two things that you put on one leg at a time and tied around your waist. So it's always been a pair of pants." ]
[ 25 ]
[ [], [], [] ]
[ "url" ]
[ "url" ]
keamdt
Why are DC motors more energy efficient than AC motors?
Take for example ceiling fans: the newer DC motor ones use up to 70% less electricity than conventional AC motor fans for the same size/output (although cost more to purchase).
Physics
explainlikeimfive
[ "gg1cnnh", "gg1sp8q" ]
[ "DC motors are more efficient, if you already have DC, like in your car. If you have AC, like in your house, and the fan includes a low cost \"wall wart\" to make DC for the fan then the efficiency of the motor is wasted in the inefficiency of the conversion. As the motor gets bigger, the efficiency flips. Electric cars and cruise ships all use AC induction motors for higher efficiency at a variety of speeds." ]
[ 7 ]
[ [], [] ]
[ "url" ]
[ "url" ]
5xgt5t
Why exactly is bouncing your legs when sitting bad?
ive always heard its bad, but wouldnt it be good since youre increasing blood circulation?
Biology
explainlikeimfive
[ "dehzn9d" ]
[ "I've never heard it being bad and can't think of a reason it would be. I would bet people have said that because it's disruptive to them, and they're hoping to scare you into stopping. I know I do it, and now and then, people will bring to my attention that I'm shaking the table in class." ]
[ 6 ]
[ [] ]
[ "url" ]
[ "url" ]
6v2oeg
Why on earth does the US government pay subsidies to farmers to not grow food?
Economics
explainlikeimfive
[ "dlx6y93", "dlx9u1n", "dlx7d35", "dlx7fsb" ]
[ "Because farmers have to make money. But we've gotten really, really good at growing stuff. In fact, we can easily grow more food than we can eat and sell. So if farmers grew as much as they could, food would flood the market and the prices would drop to damn-near nothing. Farmers would go broke, stop growing food, prices would shoot back up, maybe higher than before, people would go hungry, etc. So instead, we made a decision that, as a matter of public policy, we would exercise some control over how much food gets produced, to try to keep the price of food relatively stable. Since the government doesn't want to get into the farming game itself, or put people in jail for breaking quotas, instead they offer farmers money not to grow food some years. It keeps the prices relatively stable, and it keeps family farms in operation, which we value, partly because we want to make sure we have domestic food production and partly because we fetishize agriculture as a society." ]
[ 61 ]
[ [], [], [ "https://www.wsj.com/articles/should-washington-end-agriculture-subsidies-1436757020", "http://harvestpublicmedia.org/post/paying-farmers-not-farm-not-exactly" ], [] ]
[ "url" ]
[ "url" ]
717ytd
How does the Post Office know which piece of mail to forward? Does someone read every piece?
Random thought. Since there's no barcode how does it get sorted? There must be a ton of names on the list.
Other
explainlikeimfive
[ "dn8sc1f" ]
[ "Optical scanners read the address. They do fine with machine printed addresses like from a business or your home printer. They do *okay* with neatly handwritten addresses but sometimes they can't make it out and human has to read the address then enter it into the computer system. At that point a barcode gets printed onto the envelope or onto a sticker that is placed on the envelope and the automation system routes it to the proper address based on the bar code." ]
[ 6 ]
[ [] ]
[ "url" ]
[ "url" ]
j4iya7
What happens when you stand up too quickly?
Biology
explainlikeimfive
[ "g7j904g" ]
[ "It can depend on circumstances. Low blood pressure (natural or induced by BP meds) can cause light-headedness or even blackouts due to temporary lack of blood to the brain." ]
[ 4 ]
[ [] ]
[ "url" ]
[ "url" ]
hsyrfq
Whats the difference between a countries gdp and ppp?
i’m in a discord server in which we role play as countries. one of the key aspects of this game is buying supplies such as ships and planes. there’s a debate over whether we should use ppp or gdp. what option makes the most sense?
Economics
explainlikeimfive
[ "fydgy6m", "fyds3nm" ]
[ "GDP is usually expressed in two ways - in absolute currency amount (let’s say USD) and converted to account for different purchasing power or PPP (purchasing power parity). The latter one is useful for comparing the effect of GDP on lives of people between two countries. For example, let’s say we have two countries, A and B with the same GDP of $10. The only thing you can buy, for simplicity, is milk. In country A, $1 buys 1 liter of milk. In country B, $1 buys 5liters of milk. Although in absolute numbers the GDP is the same, person living in country B has more purchasing power than the person in country A." ]
[ 4 ]
[ [], [] ]
[ "url" ]
[ "url" ]
a7awun
What are bank bonds?
I've read up online, they are debt obligations which when you issue them, you receive an amount and that amount is a form of a loan that you need to repay. But I still don't fully understand how they work and who uses them, it's very frustrating i keep coming back to this. Also, what would i be able to understand better if I develop a better grip on the concept of bonds? & #x200B; Thank you for your time and assistance.
Economics
explainlikeimfive
[ "ec1kkxq", "ec1k1ry", "ec1qv0a" ]
[ "In addition to what others said: the advantage of a bond over a regular load is that bonds can be re-sold before the repayment date. So whoever buys them when you issue them, knows that if they want to convert to cash, they can sell the bonds to a third person. So it's easier for a borrower to sell a bond than to take out a loan. I, a bank, issue a bond for a million dollars. It matures in five years. I promise that after five years, whoever is holding that bond at that time, can come and give it to me - and I will pay them, say, a million and a hundred thousand dollars. Guy A buys the bond from me now for a million dollars. A year later he sells it to Guy B for a million and ten thousand dollars - Guy B is willing to overpay a bit to wait only four years, not five. Then Guy B urgently needs to buy a house, so he sells the loan to Guy C for nine hundred and ninety nine thousand, just to make a quick deal. Guy C holds on to the bond for another three years and sells is to Guy D for a million and fifty thousand dollars. Guy D holds on to it for a year, comes to me, and gets a million and hundred thousand from me. (In the meantime, I have lent out that million dollars to a bunch of people in short-term loans, and have made two hundred thousand dollars in interest. I give back a million and a hundred thousand, and keep the other hundred thousand as my profit.)" ]
[ 13 ]
[ [], [], [] ]
[ "url" ]
[ "url" ]
mi0ez4
Why does smoke travel the way it does? What determines it’s “shape?”
Physics
explainlikeimfive
[ "gt1xmr3" ]
[ "It simply is carried along with wind. Smoke from fire typically rises because the air containing the smoke has been heated by the fire, making it less dense than surrounding air which subsequently pushes it upward." ]
[ 3 ]
[ [] ]
[ "url" ]
[ "url" ]
fx9lqf
What is different about the insides of wires that transmit power (Charger), data (Aux, Ethernet), or both (USB-C)?
Basically what is inside that allows wires to transfer only energy, only data, or both?
Technology
explainlikeimfive
[ "fmsxpl8", "fmsz4mb" ]
[ "It's more about the connections between the two ends of the cord. Cords that are only for power only have connections at the pins that carry power, so a power only cord will have less individual wires inside it than one that can transfer power and data. That's why the power only cords are generally cheaper. They also don't have to conform to the data speed standards that data cords have to conform to." ]
[ 15 ]
[ [], [] ]
[ "url" ]
[ "url" ]
b83ygq
If water become a gas in a vacuum, wouldn't it be more efficient to build a steam engine inside a vacuum chamber ?
Engineering
explainlikeimfive
[ "ejvol09" ]
[ "Yes. If something is making water boil, then there must be a flow of heat. You can build a heat engine that extracts useful work (e.g., to generate electricity) from that heat flow. Could this be possible in some way using a vacuum chamber to boil the water? Vacuum doesn't make water boil. Heat makes water boil. When water boils, the vapor carries heat away. If you suddenly expose an open container of water to vacuum, two things will happen: (1) the water will start to boil, and (2) the water will get colder as it boils. When the water gets cold enough---maybe cold enough to freeze solid---the boiling will stop. In order to continuously boil water, at any pressure, you must have a continuous supply of heat. So, what you didn't ask was, would pulling vacuum on the outlet of a steam turbine improve its efficiency? Well, here's the kicker: In large thermal power stations, that is what they actually do. The working fluid in a large thermal power stations is de-mineralized water that flows in a closed loop. There is nothing but water in the loop (i.e., no air), so at the cold end of the turbines, where the temperature may be as low as the temperature of the cooling water that they draw from a nearby river, the pressure can be much less than atmospheric---almost vacuum." ]
[ 14 ]
[ [] ]
[ "url" ]
[ "url" ]
705le9
Why Do Phones Take pictures That Look Further Away Then They Actually are?
Repost
explainlikeimfive
[ "dn0ld2h" ]
[ "Phones use a wide-angle lens which has a different field of view than our eyes, and do not represent distances between objects the same way. This is necessary because without a wide angle lens, selfies would be impossible and you'd need to take several steps back from anything you were trying to shoot, making it useless for indoor use." ]
[ 21 ]
[ [] ]
[ "url" ]
[ "url" ]
bt67z3
How are atoms/molecules able to create a living organism?
Chemistry
explainlikeimfive
[ "eouhw8d" ]
[ "My opinion but probably \"we don't really know\" is close to the truth. We don't have any issues talking about dead or alive when dealing with animals, insects, plants, bacteria etc. But as you get smaller and smaller and simpler and simpler, this transition from \"non living\" to \"living\" isn't as simple. Are viruses alive? Are prions alive? We know the constituent molecules that make up living organisms. We are also capable of synthesizing them in labs. We can also demonstrate that some of these molecules can be formed naturally in the environment. We even understand how these molecules function in living beings. But ultimately, we are not yet at a point where we can make a \"living\" organism from scratch. On another side of things, there is AI (and associated robotics). I believe there are some estimates that our best AI today is not equivalent to that of a cockroach (maybe we're close) At some point, we may have to answer the question of whether we can produce AI that is sentient. We might be closer to AI sentience compared to our ability to build a living organism out of atoms/molecules." ]
[ 4 ]
[ [] ]
[ "url" ]
[ "url" ]
5tgn7q
Why do we see (what appears to be) so many women who kill young children suffer so little consequence? i.e. Casey Anthony, Andrea Yates, Katrina Effert, Louise Woodward, among others.
Of course, many are justly punished, but it would seem that in cases of women and their children, a surprising number of women are found not guilty, or do little to no time regardless of the evidence.
Other
explainlikeimfive
[ "ddmd88c", "ddmdavn", "ddmd6on" ]
[ "In Casey Anthony's case at least, it wasn't that they went easier on her. The jury named her not guilty, aka there was enough reasonable doubt that they weren't sure she committed a crime. Otherwise I can only imagine they succeed in pulling heartstrings and making people sympathetic, even if they did something abominable." ]
[ 6 ]
[ [], [], [] ]
[ "url" ]
[ "url" ]
7jbmpp
The Keaton Jones Controversy
Other
explainlikeimfive
[ "dr55qwk", "dr527rv" ]
[ "- Keaton is being bullied. - His mom takes a video of him crying about it, posts it online. - Turns out she has a friends who has a friend who is someone, a blue check on twitter, lots of followers. - It goes viral, as these things do. - Celebrities start offering Keaton things, trips and such. Gets an invite to the Avengers:Infinity War premiere from Chris Evans - People start questioning whether it was a good parenting decision to put her son's humiliating moment online. Red flag #1. - Mom sets up a GoFundMe, people start donating. Red flag #2. - Black twitter puts on their Sherlock Holmes hats. - They find pictures posted by the mom of confederate flags, some racist stuff, lots of trump crap. Red flag #3. - Eventually it comes out that Keaton may have bullied for being different but he also may have been bullied for calling other students niggers. - On one hand, a kid can't choose his parents. On the other hand, actions have consequences. TL;DR: Keaton is Balloon Boy 2.0 Personally, I hope he still gets to go to the Avengers premiere but only gets his picture taken with Black Panther, War Machine & Falcon" ]
[ 40 ]
[ [], [] ]
[ "url" ]
[ "url" ]
654i40
what happens to food inside a dead person?
What i mean is if a person eats and drinks and an hour later the person passes away. What happens to the food?
Biology
explainlikeimfive
[ "dg7d3t7", "dg7k3r2" ]
[ "it sits there and is processed by the enzymes, acids, and organisms it is surrounded by. the same way it would be if you were alive, just without peristalsis." ]
[ 5 ]
[ [], [] ]
[ "url" ]
[ "url" ]
5wuyo2
My first language is Vietnamese, second language English, my sister is the same as me, and we are able to switch between languages mid sentence and they would make perfect sense to us, both grammatically and syntactically; how is this possible ?
Other
explainlikeimfive
[ "ded2p83" ]
[ "It's called code switching. It's very common among people raised speaking multiple languages. It comes from the fact that languages learned before the age of 12 (or so) are much more deeply ingrained than those learned later in life and your brain can seamlessly switch between them mid-sentence or even mid-phrase. There's several hypotheses about why this happens and which hypothesis best fits varies depending on the languages involved. I don't know enough about Vietnamese to guess which one applies." ]
[ 10 ]
[ [] ]
[ "url" ]
[ "url" ]
5nbcup
Why Do We Get a Lump in Our Throats Before We Cry?
Biology
explainlikeimfive
[ "dcajfxw", "dcajpqf", "dcaprxk" ]
[ "When we are crying, our body is essentially in a state of stress. Stress activates our sympathetic nervous system which is responsible for the fight or fli8ght response. This increases blood flow and respiration. To allow for the extra respiration, a muscle called the glottis opens up for more air to pass through. Now when you need to swallow it creates tension in this muscle, resulting in that lump-like sensation. Edit: Spelling" ]
[ 655 ]
[ [], [ "http://indianapublicmedia.org/amomentofscience/a-lump-in-your-throat/" ], [] ]
[ "url" ]
[ "url" ]
5txayr
How come the North Pole is considered the "Top of the World" and the South Pole, the bottom?
Other
explainlikeimfive
[ "ddpqvh0", "ddprprj" ]
[ "The first map makers and globe artists lived in the northern hemisphere. They opted to depict their land on top." ]
[ 5 ]
[ [], [ "https://en.wikipedia.org/wiki/Dymaxion_map#/media/File:Fuller_projection_rotated.svg", "https://en.wikipedia.org/wiki/T_and_O_map" ] ]
[ "url" ]
[ "url" ]
6piei1
Why does stretching feel so euphoric?
Biology
explainlikeimfive
[ "dkpjagn" ]
[ "Basically it helps circulate blood through your body. You don't feel good when blood pools in your body." ]
[ 3 ]
[ [] ]
[ "url" ]
[ "url" ]
g74o23
What causes our own voice to sound so massively different to ourselves when speaking compared to a recording, i.e. how others perceive it? And is it possible to make others experience it the way we hear it with the help of filters, effects, etc.?
Other
explainlikeimfive
[ "foew09w", "foexngn" ]
[ "It has to do with the medium the sound you produce goes through. Inside your body, the soundwaves travel through your bones and tissue (and air obv) for you to be able to hear yourself. But for others its just air that the soundwaves travel to. Correct me if I'm wrong but I think this is why you sound different to others than to yourself." ]
[ 7 ]
[ [], [] ]
[ "url" ]
[ "url" ]
8g1sn7
Why do shirts have both horizontal and vertical button holes on the same shirt?
Other
explainlikeimfive
[ "dy85t3z", "dy88shi" ]
[ "If the horizontal button hole is in the collar (for example) it could be easier to button or look better with a tie-- which could be near or partly covering the top button. Vertical buttons are used elsewhere either for appearance/tradition or because they're easier to use. Because the collar often involves multiple layers or folded fabric, the horizontal button may be the same orientation *relative to the makeup of the fabric* before it's assembled into a shirt. This could make it tougher, or easier to produce." ]
[ 3 ]
[ [], [] ]
[ "url" ]
[ "url" ]
62s35l
Why does the stockmarket exist?
Economics
explainlikeimfive
[ "dfouosn", "dfovwgs", "dfozljh", "dfow5ff", "dfouhzj", "dfozxyy", "dfp293j", "dfouf5g", "dfoy8i6", "dfp32gl", "dfpomqc" ]
[ "Stocks were invented as a way to share risk. European countries had trading expeditions going to Asia and Americas. These expeditions took months or years and were hugely expensive to fund but when successful they were absurdly profitable. The problem was that a ship could sink or get robbed by pirates, or a number of other problems. The investors also had to stay solvent while waiting for the ship(s) to return. At one point some very smart people in Netherlands figured that if they sold \"shares\" of these expeditions they could get many more people involved as investors, thereby the risk would be shared among a greater number of people/companies. Once the expedition returned the company was dissolved and the profits, or losses, were divided up according to who owned what percentage of shares. Your reward was directly related to how much you invested. Over time this mechanism evolved to companies in general, not just companies setup for trading expeditions. Simply put it's a way to raise capital, across a large number of investors which all shares the risk and reward." ]
[ 3040 ]
[ [], [], [], [], [], [], [], [], [], [ "https://www.youtube.com/watch?v=RLySXTIBS3c&ab_channel=wKw" ], [] ]
[ "url" ]
[ "url" ]
88ygos
why does water spiral down plugs e.g. In a bath
Physics
explainlikeimfive
[ "dwo4px9", "dwo78f5", "dwoju1f" ]
[ "Whenever you have a fluid sloshing around in a bathtub, it will always possess some degree of rotation, no matter how small. As water flows into a drain, it's constricted, and so by conservation of angular momentum, whatever slow rotation (no matter how tiny) will rapidly speed up, like a skater pulling in their arms. So basically squeezing the water through the drain amplifies the random rotations always present in a body of water, causing the spiral. Nothing to do with the spin of the Earth." ]
[ 6 ]
[ [], [], [ "https://www.reddit.com/r/explainlikeimfive/comments/6vaagq/eli5_what_makes_water_swirl_clockwise_when_going/", "https://www.reddit.com/r/explainlikeimfive/comments/1kw879/eli5_why_does_water_swirl_down_drainstoilets/", "https://www.reddit.com/r/explainlikeimfive/comments/7i7fh5/eli5_why_do_whirlpools_work_like_they_do/", "https://www.reddit.com/r/explainlikeimfive/comments/3rh2ny/eli5_why_does_draining_a_large_body_of_water/", "https://www.reddit.com/r/explainlikeimfive/comments/1u4usd/eli5_why_does_water_drain_in_a_spiral_shape/", "https://www.reddit.com/r/explainlikeimfive/comments/1ir5fv/eli5_why_does_water_spiral_down_the_plug_hole/", "https://www.reddit.com/r/explainlikeimfive/comments/3uz2hg/eli5why_when_you_empty_a_bath_does_the_water_form/", "https://www.reddit.com/r/explainlikeimfive/comments/2k5iys/eli5_why_does_water_swirl_down_a_drain_and_make_a/", "https://www.reddit.com/r/explainlikeimfive/comments/29xv0q/eli5_why_does_water_swirl_down_the_drain_like_a/" ] ]
[ "url" ]
[ "url" ]
hvnddg
Why DOES the camera add 10lbs?
Technology
explainlikeimfive
[ "fyucdv5", "fyuiuwf" ]
[ "Could be the lens warping the light, often called the fisheye effect. Could just be people making up excuses for the picture being worse than expected. Some might mean it as a joke." ]
[ 5 ]
[ [], [ "https://www.reddit.com/r/interestingasfuck/comments/hdh8kb/proof_that_the_camera_adds_10_pounds/" ] ]
[ "url" ]
[ "url" ]
93iq8a
How do they make iridescent stainless steel cutlery? How does the light effect work? Will it wash off?
Engineering
explainlikeimfive
[ "e3dpolz", "e3e70b9" ]
[ "Do you mean those rainbow looking knives? A lot of those are covered with a layer of titanium oxide. When heat or an electrical current is used on titanium, it will change colors. Since this is a coating, it is possible to wash off. Compared to pure titanium which the color can be reapplied with the correct set up. [Here is a color chart for pure titanium colors done at various voltage.]( URL_0 )" ]
[ 8 ]
[ [ "http://www.torontocycles.com/sitebuilder/images/Titanium_Anodizing_Voltages-600x253.jpg" ], [ "https://en.wikipedia.org/wiki/Thin-film_interference", "https://en.wikipedia.org/wiki/Chemical_vapor_deposition" ] ]
[ "url" ]
[ "url" ]
8c1faw
How are different varieties of cheese made differently?
Chemistry
explainlikeimfive
[ "dxbar84", "dxbue00" ]
[ "Different ingredients, different storage situations, different flavirong, different length of time they are aged." ]
[ 6 ]
[ [], [] ]
[ "url" ]
[ "url" ]
h8ococ
why it seems like children as so much worse at video games compared to young adults / late teens?
When I say children, I mean those aged 11 - 15 or so. Using Overwatch as a prime example, in top 500 where all are vocal, it's entirely adults. I understand the brains of children are less developed, but they usually actually have **more** time to practice, so why is this? (I'm 13 personally so I wanted to know if there was some hard barrier from our brains being less developed)
Biology
explainlikeimfive
[ "fus0q6g", "furz27y" ]
[ "They just haven't been playing videogames for as long as the adults have. By now, even people in their 40s are young enough to have had a childhood playing videogames. 50s even if you wanna count like arcade games, which my dad played as a kid, he was born in 1964. They're no longer new-fangled technology that only kids understand. Some people are full-grown adults but have had a lifetime playing videogames. And even if a game is only a few years old, like Overwatch, there's still plenty of skills in videogames that transfer over between different games. No games are coming out that are like entirely unprecedented in how the mechanics and controls work. If you were playing first-person shooters in 2005 (holy shit that's before you were born, Jesus Christ I'm old), they play pretty similarly to how first-person shooters work in 2020. So for example even if someone only started playing Overwatch 2 months ago, and you've been playing for 2 years, it doesn't necessarily mean that they \"haven't had as much practice\" as you have. All the videogames they were playing before gave them practice for this new game. Also, and I don't mean this to be insulting, but adults are, on average, a bit smarter than kids. So there's some silly mistakes a kid might be more likely to make than an adult would. Fully-grown adult brains have better ability to plan for the future and predict the likely consequences of their choices. Which isn't to say kids don't have this ability. It's just not as finely-honed as an adult's. This might make a difference in a videogame, in terms of deciding when to run, where to aim, where to hide, etc. You're 13, you're obviously at least a little smarter than a 6-year-old. It would stand to reason a 20-year-old is at least a little smarter than you." ]
[ 13 ]
[ [], [] ]
[ "url" ]
[ "url" ]
jmsfsa
Unbiased- Why was there a penalty for not having insurance under the Affordable Care Act?
Other
explainlikeimfive
[ "gax2358", "gax24s3", "gax28dt", "gax2ds9" ]
[ "To fund the insurance. Universal insurance only works if everyone contributes to it, because you spread the risk across a pool of people. If only sick people contributed to insurance pool, they would either have to pay more or insurance wouldn’t be able to cover their costs." ]
[ 9 ]
[ [], [], [], [] ]
[ "url" ]
[ "url" ]
j1jqmz
Why does stretching feel good?
Other
explainlikeimfive
[ "g6zw4xe" ]
[ "I can't give a molecular reason of what hormones are released on why it feels good, but an evolutionary answer seems reasonable: Stretching allows a larger range of motion and supports continuous use of joints/muscles/skeletal bones which fights against atrophy (degradation of those things). Along with this large range of motion, it probably allows for higher chances of survival compared to those who didnt feel a need or benefit of stretching. So over time, the feeling of relief or \"goodness\" after stretching encourages people to stretch to ensure highest possibility of survival." ]
[ 3 ]
[ [] ]
[ "url" ]
[ "url" ]
7az1nu
how these clouds have lines in them
URL_0
Physics
explainlikeimfive
[ "dpe10d8" ]
[ "You know how water sometimes gets waves? Or how sand will occasionally look wavy? Its basically the same thing - air patterns forcing the water (clouds) into separate lines of waves - in the sky. Cool pic. Btw." ]
[ 14 ]
[ [] ]
[ "url" ]
[ "url" ]
6nqlcd
How do professionals know when it's the right time to release a patient from a mental institution?
Biology
explainlikeimfive
[ "dkbi6xh", "dkbnsyy" ]
[ "They don't. Generally, for most people, they decide they are sane when their insurance money runs out. When a court commits someone for insanity they are generally never let out, or let out after many decades when they are no longer any possible threat. These days, for the most part, mental 'institutions' are money making operations that take in people committed by the court or by family members only for as long as the money lasts." ]
[ 14 ]
[ [], [] ]
[ "url" ]
[ "url" ]
kew84f
Why microwaving food with a glass of water inside prevents it from getting dry?
Chemistry
explainlikeimfive
[ "gg4vhie" ]
[ "The water absorbs a lot of the microwaves, so it's like microwaving your food at a lower power. This allows more time for the interior of the food to heat up by conduction before the outside is boiled dry. What I personally do is microwave on high until part of the food starts boiling, then reduce the power until it is evenly heated. Similar effect but a bit faster, and you're not wasting energy heating the water. Covering the food can also help it heat more evenly/faster." ]
[ 18 ]
[ [] ]
[ "url" ]
[ "url" ]
84veuw
How much does gasoline contract when it's cold?
Chemistry
explainlikeimfive
[ "dvsntox" ]
[ "Good question. Because of how much a liquid will contact and expand because of temperature, fuel volume at large depots is calculated to a standard temperature of 15c. Some petrol stations now calculate the fuel to what the volume would be at 15c. When filling your tank in the cold the fuel is more dense, so they take the metered amount and apply a standard equation. When you calculate the higher temperature for a metered volume you end up with a larger volume, and a higher price. I can't remember the name of the equation but it is a global industry standard method of calculating petroleum volumes. It shouldn't make that much of a difference in your car, but when you're buying/selling thousand of gallons at a time you could lose or gain a lot of fuel. I'd try a different petrol station mate." ]
[ 3 ]
[ [] ]
[ "url" ]
[ "url" ]
6jl9r6
why do people wake up from naps with headaches?
Biology
explainlikeimfive
[ "djfc43p", "djf9zjn" ]
[ "Depending on length and circumstances it could be dehydration headache. I used to get them all the time until I discovered that I had to drink water almost constantly to stave them off." ]
[ 8 ]
[ [], [] ]
[ "url" ]
[ "url" ]
b085cg
What makes “unsolved math problems” so difficult to solve if you continue to answer/follow the formula?
Mathematics
explainlikeimfive
[ "eicpjtd", "eicqk49", "eiconk8", "eicx8ev", "eicyed8" ]
[ "There isn't always a formula that you can easily follow and just get the information that you want. For example, one of the biggest and easiest to understand unsolved problems in math is Goldbach's conjecture. Goldbach's conjecture is that every even integer greater than 2 can be expressed as the sum of two primes. This... makes sense. 4 is 2+2 6 is 3+3 8 is 5+3 10 is 5+5 And if you continue this pattern, you'll find that it works for *every* even number that you try. But here's the catch-- even though it seems like it works for every number, no one has proved it. And what formula would you even follow to solve this?" ]
[ 36 ]
[ [], [], [], [], [] ]
[ "url" ]
[ "url" ]
5rrlew
-How do plants move to face the sun?
1) How do they know where the sun is? 2) By what mechanism do they actually move?
Biology
explainlikeimfive
[ "dd9m2gl", "dd9m0m5", "dd9u8y2" ]
[ "Plants produce a hormone called auxin. It is produced in the top of the stem and moves downwards. Auxin has the ability to promote elongation of cells (stretching). The area that sunlight hits on a plant blocks the flow of auxin, causing an imbalance that results in one side having elongating cells whilst the others remain the same. As one side elongates, it causes the stem to bend, pointing towards the light. [This image gives a great visual depiction.]( URL_0 :) IAA is the auxin" ]
[ 120 ]
[ [ "https://www.google.com.au/search?q=auxin&source=lnms&tbm=isch&sa=X&ved=0ahUKEwjHr9CygvPRAhVLabwKHch4COQQ_AUICCgB&biw=1286&bih=776#imgrc=irmtDB87expClM" ], [], [] ]
[ "url" ]
[ "url" ]
m4o2gb
Why do (most) people stop wetting the bed as they grow older?
Biology
explainlikeimfive
[ "gqvdh1x" ]
[ "Practice and development. Younger brains are less developed so they don't register everything they should or control the body properly. Likewise, holding in your pee hasn't become habit yet so you need to be conscious to do it." ]
[ 3 ]
[ [] ]
[ "url" ]
[ "url" ]
epomo5
Where do the eyelashes that get into your eye go?
Biology
explainlikeimfive
[ "fekppo8", "fekyxi6" ]
[ "They either remain under the eyelid, in which case you know, cause it continues to cause irritation and your eyes to produce extra tears. Or the friction of your eyeball and eyelid rubbing causes the lash to move out from under the lid to the corners of your eyes where they can be wiped away, or bound with dry tears into that crusty stuff you wipe away when you wake up. They definitely don't do this: URL_0" ]
[ 12 ]
[ [ "https://puu.sh/F0z2k/3419cd1850.png" ], [] ]
[ "url" ]
[ "url" ]
60ho41
The Byford Dolphin explosive decompression accident.
Other
explainlikeimfive
[ "df6i0vb" ]
[ "There is a practice called saturation diving where commercial divers working at great depth, usually on oil drilling installations, stay at the pressure of their seafloor work site for weeks at a time since decompressing safely from those depths takes > 12 hours, which would be hugely inefficient if you had to do it to come back from work every day. The way they do this is by living in a system of pressurized chambers in the hull of a ship anchored above the work site and \"commuting\" to work in a diving bell, essentially a pressurized chamber that detaches from the ship and opens up at the work site, where its pressure matches that of the surrounding water. The Byford Dolphin accident happened when saturation divers working at 9 atm of pressure (so the work site on the seafloor, the diving bell, and the pressurized living chambers on the ship were all at 9 atm) were returning in the diving bell from the work site to the pressurized chambers in the ship after a day of work. To go from the diving bell to the ship, the hatches of the diving bell and pressurized ship chamber were lined up and clamped together by two shallow divers working on the outside. The hatches were then opened, connecting the diving bell to the chambers on the ship and allowing the divers to pass through. To detach the bell, the hatches between the diving bell and the chambers would first be closed and sealed, and the shallow divers on the outside would then release the clamps and separate the diving bell. During the accident, however, one of the shallow divers released his clamps while the hatches were still open. This broke the connection between the bell and the chambers, effectively turning the chamber hatch where the bell used to be connected into a giant pressure-relief valve. The 9 atm air inside the chamber exploded out of the hatch, instantly depressurizing to 1 atm. This rapid decompression immediately killed all four divers inside the chamber. One diver was exiting the diving bell when this occurred and was therefore located just inside the hatch, where the pressure gradient was extremely high. That is, for a fraction of a second, his lower body might have been at ~1 atm while his upper body was at ~9 atm. The escaping air also sucked him out of the inward-opening hatch, which was itself being sucked shut and slammed closed on him as he was halfway through. This caused him to simultaneously tear in two from being sucked out while trapped in the hatch and explode violently from decompression. This reportedly launched some bits of him as far as 30 ft away, which is the gory detail that makes this story famous. The diver that released the clamps was killed by the force of the air exploding out of the hatch (not decompression, since he was outside the pressurized system), so no one knows why he did it. He was probably just confused and thought the hatches had been closed. I realize this is very long, and perhaps not explained as concisely as it could be. Do ask if you have any questions!" ]
[ 4 ]
[ [] ]
[ "url" ]
[ "url" ]
7it6ev
what is ‘proof-of-work’ and ‘proof-of-stake’ and what is the difference
Newb but not a n00b
Engineering
explainlikeimfive
[ "dr18g6f", "dr1l4p0" ]
[ "Proof of work: I trust this because it was \"carved in stone\" and accepted by the community. The work involved in crafting it makes it near impossible to tamper with it. Proof of stake: I trust this because it was created by, and signed by people who have a a personal stake in it." ]
[ 4 ]
[ [], [] ]
[ "url" ]
[ "url" ]
gv95to
How is it more efficient to keep the AC on all day rather than turning it off in the morning and back on in the evening?
Technology
explainlikeimfive
[ "fsn9hx3", "fsnajo2", "fsn8gnd" ]
[ "In point of fact, it is _not_ more efficient to keep it on. Every second that thing is running it's actually a) making heat (outside, thermodynamics-style) and b) making your house gain more BTUs/s from the outside (by increasing the temperature differential)." ]
[ 107 ]
[ [], [], [] ]
[ "url" ]
[ "url" ]
htrcwt
What makes certain perfume scents last longer than others?
Chemistry
explainlikeimfive
[ "fyikfhz" ]
[ "Quality. Both in the fragrance itself and the carrier medium. Also it could come down to desensitization to a particular smell, meaning your brain says “you have already smelled that, I’m not going to remind you of it every breath.”" ]
[ 5 ]
[ [] ]
[ "url" ]
[ "url" ]
j64x6g
Why do white / grey hairs feel different?
Biology
explainlikeimfive
[ "g7w6x4o" ]
[ "One notable feature of gray hair that can contribute to its having different properties from pigmented hair is the presence of a medulla. Most animal fur contains a central hollow core called the medulla, which provides insulation for the mammal. In contrast, this feature is generally missing in human hair, but sometimes appears in white strands. This presence of this hollow core may change the physical properties of the hair, making it more wiry and unruly." ]
[ 51 ]
[ [] ]
[ "url" ]
[ "url" ]
jbwdt4
Why does it matter so much that a badly wounded person must not faint or lose consciousness? Does it actually affect the chances of survival of said person?
Biology
explainlikeimfive
[ "g8xthce", "g8xzeaw", "g8y131i" ]
[ "It’s difficult to tell how seriously someone is injured by their outward appearance. The line between seriously injured and bout to die though is even slimmer and more difficult to visually identify. I’m not sure there is any difference between a person living or not because they were kept awake, but for an EMT or medic, the ability to tell when someone is needing immediate help and dying without intervention is easier to tell by whether they’re awake or not and how they are responding to you. Going a little past eli5, you can gauge a persons level of injury by their reactions to your actions. Say a person who was shot is sitting there talking to you as you ask about something unrelated, family or job. His responses making sense and keeping him distracted help him in the moment. At a secondary level, you know there’s huge problems if all of the sudden he stops talking, making sense, getting sleepy, etc. Outside of a hospital, you only have so much you can do before people die without surgery. If you’re doing all you can and someone still crumps on you, it’s time to either try something else, or CPR is about to begin. With head injuries, you might be talking to a person who is answering and responding appropriately. By keeping them awake, you can gauge whether they are stable or if they are getting worse. Someone who began responding normally and suddenly transitions to slurring and speaking incorrectly is an indication they are in serious trouble, and while you may not be able to resolve that issue, to be able to relay that to the hospital so they can have surgeons and staff called in and be at the ready to take on this patient can be life or death. To summarize, it helps you decide how seriously someone is injured and whether they are doing okay, getting better, or getting worse. Edit: My first gold comment. Thanks to the stranger who did so, and to everyone upvoting. Glad I can help." ]
[ 149 ]
[ [], [], [] ]
[ "url" ]
[ "url" ]
jkrh3l
Why do we hold up our pinky finger while having a drink?
Other
explainlikeimfive
[ "gakuxi1" ]
[ "It was a trend started by some queen victoria back in the day. She had a broken pinkie and really didn't have a choice. It caught on as a trend due to her popularity. Wearing pink and red colors for girls was a trend she started as well if I recall correctly. Prior to this, red and pink was thought to be masculine colors." ]
[ 6 ]
[ [] ]
[ "url" ]
[ "url" ]
9lsmlu
What caused the deserts across the Sahara, Middle East, and Central Asia?
What weather conditions created [this]( URL_0 )? Or did ancient civs have access to nukes? All I've heard for central asia is that the Himalayas block moisture from the Indian Ocean leading to a rainshadow effect. Edit: I still think this is the result of the Finno-Korean Hyperwar
Other
explainlikeimfive
[ "e7991np", "e79bk77", "e79c5cl", "e79f180", "e79bsr0", "e79go4e", "e79cywm", "e79d9in", "e79gpkt", "e79csou", "e79uakc", "e7a34mc", "e79dh8e", "e79dhjs" ]
[ "“Between 30 and 35 degrees both north and south where Earth's atmosphere is dominated by the subtropical high, an area of high pressure, which suppresses precipitation and cloud formation, and has variable winds mixed with calm winds” Basically there’s regions where rain is unlikely to form due to global air currents as hot air at the equator rises and then falls beyond this zone URL_0" ]
[ 3315 ]
[ [ "https://en.wikipedia.org/wiki/Horse_latitudes" ], [], [], [ "https://en.wikipedia.org/wiki/5.9_kiloyear_event", "https://en.wikipedia.org/wiki/4.2_kiloyear_event" ], [], [ "https://imgur.com/a/GMyqHhA" ], [ "https://blog.frontiersin.org/2017/03/14/did-humans-create-the-sahara-desert/" ], [], [], [], [], [ "https://en.m.wikipedia.org/wiki/Aral_Sea" ], [], [ "http://www.storagetwo.com/blog/2017/5/hadley-cells-a-crucial-cog-in-earths-climate-machine" ] ]
[ "url" ]
[ "url" ]
i6910s
When fruit ripens it gets sweeter. Does that mean the sugar content increases? If so, how does this work?
Other
explainlikeimfive
[ "g0u9n1v", "g0u6gay", "g0u9rhc" ]
[ "Unripe fruit has a lot of starches. Starches are technically complex sugars but they don't taste sweet. As the fruit ripens the starches are broken down into simple sugars. These simple sugars are sweet tasting." ]
[ 41 ]
[ [], [], [] ]
[ "url" ]
[ "url" ]
a7cw2m
How do investment firms work?
Economics
explainlikeimfive
[ "ec23nij" ]
[ "Kinda, yeah. Buy low, sell high. Think of it as a house flipping show but for businesses. Buy out that old mom & pop restaurant, gut it, then remodel it to spec for a local restaurant group. There's a company in my town that's basically playing Monopoly. They're slowly buying up whole city blocks parcel by parcel near the rich part of town. $100k here for a gym, $1mil there for a jewelry store, say $5mil over the course of 6 years and they've got the whole block. When they take ownership, the businesses there aren't affected at all. They even keep their rent steady. But when the block is 100% owned by them, they turn around and sell it to a big time developer for $30mil so it can all be bulldozed and converted to a 20-story tower. It's a story straight out of a Muppet movie, except nobody's really that sad to see the area go. The better firms will have partnerships or relationships with construction and engineering companies to cut down on costs, or some form of specialization like buying EPA Biohazard sites. Ultimately, it's not far from flipping houses on HGTV but on the multi million dollar scale." ]
[ 3 ]
[ [] ]
[ "url" ]
[ "url" ]
b86m8x
What exactly is the correlation between having great credit and auto insurance cost. When you are paying your premiums in advance.
Economics
explainlikeimfive
[ "ejw53uw", "ejw88a5" ]
[ "Having good credit shows a responsible adult behavior pattern, which contributes to good driving behavior pattern. There is no direct correlation between credit score and accident rate." ]
[ 6 ]
[ [], [] ]
[ "url" ]
[ "url" ]
9uzeay
How does a projector project black light?
Technology
explainlikeimfive
[ "e982zfl", "e9832nh" ]
[ "They don't. The \"black\" parts of the projected image just don't have any light. So you're just seeing the absence of light on parts of the screen which looks black in contrast to the rest of the image." ]
[ 10 ]
[ [], [] ]
[ "url" ]
[ "url" ]
aeuqio
Why things feel wet when they're cold?
Biology
explainlikeimfive
[ "edstnbs", "edsu32j" ]
[ "Because our nerves can't feel \"wet\", our brain decides something is wet by combining the inputs it does get from tempreture and pressure. It's why water at exactly body tempreture doesn't feel wet, we only feel the pressure." ]
[ 25 ]
[ [], [] ]
[ "url" ]
[ "url" ]
micttk
How are wheels able to turn using the steering wheel even though all of the car's weight is on the wheels?
Engineering
explainlikeimfive
[ "gt40cyf", "gt4p6p7", "gt40ql7", "gt41rag" ]
[ "Well, these are the two main reasons I would give: 1. The force of weight is directed downward, but the turning force that moves the wheel is to the side. You’re not fighting the weight of the car to rotate the wheels. However, the weight of the car does contribute to a frictional force between the wheel’s rolling surface and the road surface. It’s still hard to turn the wheels. This is greater when the car is stationary. Leading to number 2: 2. Power steering. The car mechanically helps you turn the wheels. When this system goes out, or on an older car that doesn’t have it, you really notice. There’s more to it, but this is ELI5 not ELIPHD and I think the majority of folks here haven’t met many 5 year olds lmfao." ]
[ 28 ]
[ [], [], [], [] ]
[ "url" ]
[ "url" ]
5lvlzr
How much power does the computer need to fully emulate human's brain?
Technology
explainlikeimfive
[ "dbysurz", "dbyuamb", "dbz501w", "dbyu2u7", "dbyt5qc" ]
[ "since we don't have anywhere near enough knowledge of how the human brain works to be able to make a computer emulate one, the correct answer is: No one has a clue." ]
[ 41 ]
[ [], [], [ "https://blogs.scientificamerican.com/news-blog/computers-have-a-lot-to-learn-from-2009-03-10/", "https://en.wikipedia.org/wiki/Sunway_TaihuLight", "https://en.wikipedia.org/wiki/Tianhe-2" ], [], [] ]
[ "url" ]
[ "url" ]
gexedn
Why do humans as a species form deep emotional connections with their young?
What is the purpose in nature for humans to not only form such deep relationships with their children but to keep them in the house for almost two decades? In nature we observe other animals who protect the young during the most vulnerable years, and let them go free once they are out of this age. Why are we not like this?
Biology
explainlikeimfive
[ "fpq6gn7", "fpqesq2" ]
[ "Human young remain vulnerable for very long compared to other young. Humans also have few children and so are able to invest much more effort into each one. Finally, in part because of the latter, we protect our children well into adulthood and even our grandchildren." ]
[ 8 ]
[ [], [] ]
[ "url" ]
[ "url" ]
isqujp
When running the shower, bath or otherwise, why does the sound of the water change as the temperature increases?
Physics
explainlikeimfive
[ "g5afq1o", "g5ag0s0" ]
[ "There are two common answers to this, but only one of them is right. 1) sound travels faster in hot water than cold, so sound waves bounce around in the pipes at different frequencies. 2) hot water has a lower viscosity (thickness vs runniness) than cold water, so the turbulence of the water flowing through the pipes and valves is damped out differently. \\#2, viscosity, is the most important factor. One reason why is that the speed of sound only varies by about [10%]( URL_1 ) as water goes from freezing to boiling, but the pitch of water in pipes changes by much more than that. The viscosity of water, on the other hand, changes by [600%]( URL_0 ) over the same temperature range! Agree with /u/svangren : check out Steve Mould's video, which is linked in their comment below." ]
[ 23 ]
[ [ "https://www.engineeringtoolbox.com/water-dynamic-kinematic-viscosity-d_596.html", "https://www.engineeringtoolbox.com/sound-speed-water-d_598.html" ], [] ]
[ "url" ]
[ "url" ]
hmjxjh
Why do cockroaches flip over when they die?
Biology
explainlikeimfive
[ "fx5njf5", "fx64ql1" ]
[ "In a domestic situation, a roach may find itself flipped over on a smooth floor of polished wood, tile or stone. With a relatively high center of gravity and a smooth, rounded back, a roach that gets turned over for any reason will find it very hard to right itself without twigs, leaves or other uneven features for its legs to push against, features that it often finds outside in nature. And if the roach has been the target of an insecticide, certain kinds of poison, notably organophosphate nerve poisons, cause muscular spasms that can flip a cockroach onto its back. These nerve poisons can inhibit an enzyme called cholinesterase, which breaks down a neurotransmitter called acetylcholine. An excess of this chemical in the nervous system leads to the spasms and interferes with muscular coordination, leaving the insect trapped on its back as it dies." ]
[ 66 ]
[ [], [] ]
[ "url" ]
[ "url" ]
b082ev
How does your brain filter out seeing your nose?
I know it does this because it blocks part of your visual field. But how does it know it's your nose it's filtering out?
Biology
explainlikeimfive
[ "eicpzqx", "eicvghx", "eid2sze" ]
[ "Your brain probably doesn't \"know\" that it is your nose. If someone were born without a nose, and I stuck a piece of plastic in the bottom center of their visual field where their nose would have been, they would tune it out too. Our senses habituate. Given enough time, we can tune out external stimuli of any sensory modality. That's why you \"get used to\" a bad smell, you can tune out a buzzing sound once you're in the room long enough, and why you can't \"see\" your blind spot. All of our senses (except smell) connect to a place in the brain called the thalamus. The thalamus is a sort of relay station where it integrates all the senses together, helping provide a unified image of the world. The thalamus also probably plays a role in a sort of \"filter,\" parsing out useless information and \"letting through\" useful information to your cortex where it is consciously processed and used. It's likely in the thalamus that the visual input of your nose is filtered out." ]
[ 11 ]
[ [], [], [ "https://www.youtube.com/watch?v=vJG698U2Mvo" ] ]
[ "url" ]
[ "url" ]
6h6ehv
How do cubesats deployed from the ISS get into other orbits?
I recently read that a lot of cubesats are now deployed from the ISS instead of piggy-bagging on a satellite launch. That left me wondering how they are moved out of the ISS orbit. As far as I know cubesats do not have propulsion systems on their own. Or maybe I'm wrong in assuming that they are moved into different orbits after deployment. But that would leave the ISS orbit "full" of cubesats, creating difficulties for approaching crafts/the ISS itself.
Engineering
explainlikeimfive
[ "divvgl2" ]
[ "They use a robotic arm with an ejector system to launch the satellites into their orbits. This would mean that the two orbits would cross at one point, but the difference in speed, the different drag, and the fact that the ISS regularly boosts its orbit, means that the danger of a collision is miniscule." ]
[ 4 ]
[ [] ]
[ "url" ]
[ "url" ]
e7oyub
Recently I saw a video where a zebra tries to drown the offspring of a rival male. How are animals in the wild able to tell the difference between their offspring and others’?
Biology
explainlikeimfive
[ "fa287od", "fa2loyr", "fa2jjyx" ]
[ "The truth is, we really don't know for certain. It's kind of a drag really, not being able to just directly ask them. It also almost certainly varies because animals perceive the world differently based on their species. Some rely heavily on sound while others use smell as a primary sense. Do some babies smell different? Sound different? I'm sure there's some primary literature out there where researchers tried to control for the five senses and see if fathers could still recognize their offspring: coat them in a strongly-smelling substance or put them behind glass so they can't hear or smell them at all. It would be an interesting experiment. Many mammals *can* definitely recognize each other just as we humans do, and there are some species where females routinely mate with multiple males. I believe the theory behind that just boils down to a female trying to trick all males in the area into thinking her kids might be theirs so they don't kill them when they run into a female they know they've mated with. Everyone wins." ]
[ 91 ]
[ [], [], [] ]
[ "url" ]
[ "url" ]
6h7ymq
What is the difference between a state and a commonwealth? Is there a perk to one over the other? I am from the Commonwealth of Kentucky. I have googled the difference, but have not been able to find a source that clearly articulates the difference...
Other
explainlikeimfive
[ "diw6qck", "diw8gpc", "diw8br1" ]
[ "I too am in Kentucky, and the difference is basically 'which word do we print on our official materials.' Hi neighbor." ]
[ 6 ]
[ [], [], [] ]
[ "url" ]
[ "url" ]
642nie
If a large enough asteroid struck somewhere on the other side of the world from you, could you hear it?
Physics
explainlikeimfive
[ "dfyxck6", "dfyx3p3" ]
[ "The krakatoa eruption was supposedly audible for thousands of miles. A large asteroid impact would be orders of magnitude more powerful. Waves moving *through* the Earth would reach you before waves moving *around* the Earth though, so you might already be having problems before the sound makes the trip." ]
[ 15 ]
[ [], [] ]
[ "url" ]
[ "url" ]
d41ct5
Why can't landers/rovers be landed or operated on the moon the same way drones are operated on Earth?
In light of the recent Chandrayaan landing failure on moon's surface, I am curious why the landers and rovers can't be operated remotely by Earth based pilots similar to how Predator drones are flown in middle East by pilots in the US? Can't communications to the lunar done be mediated through a moon orbiting satellite and since radio waves travel at light speed it should only take about 1s from Earth to moon?
Technology
explainlikeimfive
[ "f06meg5", "f06mksu", "f06mei5" ]
[ "A 1 second delay means any feedback you control is 2 seconds behind. Try driving a RC car around a track with 2 second delay. Its going to be really hard." ]
[ 12 ]
[ [], [ "https://www.youtube.com/watch?v=kxuwPRY8kEo" ], [] ]
[ "url" ]
[ "url" ]
dncbc1
How exactly does my brain know to wake me up at exactly the same time every day, with or without an alarm?
On days I want to sleep in, my brain wakes me up anyway. Help
Biology
explainlikeimfive
[ "f59kl70", "f5aegm7", "f59m22t" ]
[ "Biorhythms and habits. The explanation is a bit long, but there's a tl;dr at the end. In a nutshell, the largest culprit are biorhythms. Living things do have internal clocks, it's not just a figure of speech. You have a lot of chemicals, mostly hormones, that go up and down regularly, in relation to what happens around and in you. These are all clocks that regulate when things must happen in your body. The ones you may know best from school are those that regulate the female period. The hormones change during the month and define when the period should start. You have biological clocks (or biorhythms or circadian rhythms) for other things too, such as eating, and also sleeping. So now the new questions is \"what does regulate the hormones?\" As for sleeping, scientists know sunlight has a big role, by stimulating the production of melatonin (which is the sleep hormone and requires sunlight). Stress, eating habits, exercise, etc also regulate the hormones connected to the sleep cycle. But this just defines a rough, good sleep pattern (so that you are sleepy at night and wake up somewhere during the morning). It's the habits that pinpoint the exact moment. Your body and your brain are wired to create habits. It helps doing things right and not always worry about the details: imagine having to put all your attention to opening a door every single time you do it. Not efficient. The brain works so that repeated behaviors change your connections brain connections. These connections are easily built if the behavior has a positive result. These new connections make it easier for the behavior to be repeated, even unconsciously. That's how you learn. With all this stuff in mind, here's the tl;dr When you go to sleep and wake up at the same time you tune the sleep hormones cycle so that it matches the same time frame every day. With time, this becomes an habit as the brain changes and learns to do that more often. It becomes easier to do that and all your biological mechanisms work fine, in tune and are happy that nothing is disrupting the equilibrium. On a side note, this last part is also why having an healthy sleep pattern does wonders for health and mood." ]
[ 64 ]
[ [], [ "https://earthsky.org/human-world/cool-facts-about-your-biological-clock" ], [] ]
[ "url" ]
[ "url" ]
ads92i
Why exactly do people raise their voice to appear more friendly/less threatening?
You know, like the ‘phone voice’ or ‘customer service voice.’ Similarly, why exactly do we shout when we are trying to appear more intimidating? EDIT: it’s probably obvious but just to clarify, for the first question I mean the pitch of their voice not the volume.
Biology
explainlikeimfive
[ "edjt6qt" ]
[ "Babies and young children have higher pitched voices, so our brains are probably wired to think of those voices as less threatening or friendly Edit : changed lower to higher" ]
[ 4 ]
[ [] ]
[ "url" ]
[ "url" ]
9di1bu
Why is the floor considered ‘dirty’ from a microbial perspective? Isn’t it a poor environment for growth with no water or nutrients?
I imagine you would exchange many more lasting germs with a simple handshake.
Biology
explainlikeimfive
[ "e5hp5b9", "e5i1vzi" ]
[ "Bacteria can live for a short time on the floor and it's considered that you walk on there so you drag new ones from the outside. Also dust settles on the floor after falling from objects and as it's mostly skin cells the bacteria aren't totally out of food (also dust is bad on it's own)" ]
[ 6 ]
[ [], [] ]
[ "url" ]
[ "url" ]
8ai266
how did we manage to create the machine or whatever that makes transistors with dimensions in nanometers
Engineering
explainlikeimfive
[ "dwysf2r", "dwytxco" ]
[ "At such small sizes, transistors are not made individually. Instead, the entire circuitry is 'etched' into the surface of a semi-conductor plate, called the die. Then, that die is subjected to various chemical and physical treatments to create nanometer-sized spots on its surface with different electrical properties, which make up all those millions and millions of transistors. Of course, the real process is *much* more complicated than this, but that's the general idea." ]
[ 8 ]
[ [], [] ]
[ "url" ]
[ "url" ]
ibzgkx
How come some siblings look way more similar to each other and some look like they are from different parents?
Biology
explainlikeimfive
[ "g1z0hi3", "g1z1y5w" ]
[ "Everybody inherits 50% of genes from the father and 50% from the mother but these are not necessary the same 50%, they are chosen randomly. So, some siblings can have more appearance-defining genes in common, some less." ]
[ 35 ]
[ [], [] ]
[ "url" ]
[ "url" ]
be0tuv
I understand the concept of how ray-tracing works, but what was changed to make it work in real-time on graphics cards?
Technology
explainlikeimfive
[ "el2e2fr", "el28os5" ]
[ "New algorithms simplify the computations required. Also, building GPU chips for ray tracing means the hardware is better suited for the specific tasks that ray tracing demands. We've heard for years that real-time ray tracing was decades away from being possible (or perhaps impossible), but that was assuming every single pixel was being ray traced. When you only ray trace a fraction of the pixels and then interpolate the results for nearby pixels, it becomes a lot more doable." ]
[ 7 ]
[ [], [] ]
[ "url" ]
[ "url" ]
o0sy0k
How does turning off your computer with the physical power button cause file system damage?
I was always told never to turn off my computer (or even gaming consoles) with the power button because it can mess up the file system. But I never understood how it happens, or why it happens. Do you think computer technology will ever advance past this obstacle?
Technology
explainlikeimfive
[ "h1wz58z", "h1x79ne", "h1x3gby", "h1x07aa", "h1x39bg" ]
[ "Files systems are slow. Your computer and game console will sometimes keep data cached in RAM and commit it to the file system at a later time. If you turn off the power before the data is written to the file system then it could result in data corruption." ]
[ 26 ]
[ [], [], [], [], [] ]
[ "url" ]
[ "url" ]
d6wnw0
Do wasps/hornets do anything for the environment? Or do they only exist to be a nuisance to society
Biology
explainlikeimfive
[ "f0vxms1", "f0w07tc", "f0w47wu", "f0vxvyl" ]
[ "They prey upon a wide variety of other insects, including a lot of other insects that have negative impacts on humans, like cockroaches and boll weevils. Without them we could expect to see far more of these pests." ]
[ 9 ]
[ [], [ "https://i.pinimg.com/originals/5b/3c/19/5b3c198d28d31c3d83014546856d956b.jpg", "https://www.pnas.org/content/pnas/92/10/4169.full.pdf", "https://www.fs.fed.us/wildflowers/pollinators/animals/wasps.shtml", "https://i.pinimg.com/originals/d5/9f/5d/d59f5d765a6daddde30a9c0629df68e1.jpg", "https://entomologytoday.org/2015/09/21/trichogramma-wasps-used-as-biocontrol-agents-in-the-greater-mekong-region/" ], [], [] ]
[ "url" ]
[ "url" ]
a03pe9
Why does the flesh of some animals, such as shrimp, turn pink when cooked?
Biology
explainlikeimfive
[ "eaeh52t" ]
[ "The pink/red chemical is covered by a protein. Heat it up, protein unravels, pink chemical comes out." ]
[ 4 ]
[ [] ]
[ "url" ]
[ "url" ]
771a2a
Why does it take 3-5 days for an email service to unsubscribe me from their list?
It just seems like this should be able to process within a few minutes and not a few days.
Technology
explainlikeimfive
[ "doi8235" ]
[ "It doesn't, they're just covering their asses in case there was an email being sent to you by some server somewhere in the pipeline. Unsubscribe requests filter into lists gradually." ]
[ 3 ]
[ [] ]
[ "url" ]
[ "url" ]
fo3zev
What is the military grade GPS and why can't we receive its signals just like normal GPS?
Engineering
explainlikeimfive
[ "flcz4a2" ]
[ "You are receiving the military signals. The US military disabled selective access in 2000, and ever since everyone on the planet has had the exact same GPS accuracy as the US military. Prior to 2000, the last few decimal points of the timecode were encrypted, so that only the US military could get full accuracy." ]
[ 14 ]
[ [] ]
[ "url" ]
[ "url" ]
8wo7o2
Would I have a similar experience to having a bigger TV, if I sat closer to a smaller TV?
I'm really curious about screen size/viewing distance ratios. I really like to sit towards the front of the movie theater because it feels like the screen is bigger and more immersive. However, if I were watching a movie on my phone up close, wouldn't it look bigger? Would that be a superior experience (assuming I am using high quality headphones)?
Technology
explainlikeimfive
[ "e1x2skc" ]
[ "No because you would have to move the phone too close to your eyes for that to be comfortable. Also, you have to hold the phone or buy/design something to hold the phone less than a few inches from your face. Might as well get a VR headset and watch the movie that way." ]
[ 3 ]
[ [] ]
[ "url" ]
[ "url" ]
euqp7y
Why is IP geolocation not exact? Why does an ip tracker or ip lookup website show a place a bit distant from my street?
Technology
explainlikeimfive
[ "ffqxyoq", "ffqy607" ]
[ "IP geolocation works the same way someone could guess your location from your phone number. Different area codes and prefices are assigned to different regions (or at least they use to before cell phones messed things up), and if you knew the pattern you could make a good estimate. IP addresses work the same way, ISPs control certain ranges of IP addresses, and often break them up by region. The location you are seeing could be an arbitrary point in the middle of the region that has IP addresses like yours, or it could be one of the ISPs routing junctions. Or, as is often the case, it could be completely wrong." ]
[ 14 ]
[ [], [] ]
[ "url" ]
[ "url" ]
f6e2or
temperature changing the taste of water
If it’s just too much or too little heat, why does it taste so different? Also, why does hot water taste bad? We need water to survive, but hot water tastes so bad I’d rather stay thirsty than drink it
Chemistry
explainlikeimfive
[ "fi49dnx", "fi48y3r" ]
[ "Tasting in general works better when food is hot. This is why most food is eaten hot, and foods that are supposed to be eaten cold can taste weird when warm. (Have you ever eaten warm melted ice cream? It's sickeningly sweet, because when it's cold you don't taste it as much)." ]
[ 21 ]
[ [], [] ]
[ "url" ]
[ "url" ]
khedar
How did Thalidomide cause birth defects?
Biology
explainlikeimfive
[ "ggkotwm", "gglqif4" ]
[ "It's not fully understood *how* but the effects are well known. Some of the reason for the really damaging results were due to when it was taken, a very vulnerable phase in embryonic development. Theories include effects related to cell death—which it is known to cause–and interruptions in cell division. The best theory is that it prevents the development of blood vessels, which as you can imagine, could be catastrophic. URL_0" ]
[ 8 ]
[ [ "https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4737249/" ], [] ]
[ "url" ]
[ "url" ]
kozx0x
What is it specifically about substances like mercury and lead that kills you?
I understand something like Carbon Monoxide which physically takes up space that should have oxygen there but what about lead in my blood kills me? Is it a chemical reaction that steals nutrients? Does it puncture blood cells?
Chemistry
explainlikeimfive
[ "ghu4y8q", "ghu52py" ]
[ "Many proteins in your body incorporate atoms/molecules of specific metals like iron, copper, manganese etc. Those metals are crucial to how those proteins function. Heavier metals, like mercury can be put into those proteins by mistake. This means the protein will no longer work. Depending on what the protein does normally, that can cause lots of problems." ]
[ 18 ]
[ [], [] ]
[ "url" ]
[ "url" ]
irqyyg
Why can only one person talk on a walkie-talkie channel at a time?
Technology
explainlikeimfive
[ "g51l2bc" ]
[ "Radios can't receive and transmit on the same frequency (channel) at the same time; their own transmission drowns out the weak signal from a distant transmitter. If you need handle messages in both directions at once then you can use two different channels, but even then it's difficult to receive while transmitting because the local transmission is so much more powerful than the received signal that it can swamp the tuning circuits. Another approach is to use just one channel but switch rapidly between sending and receiving. Walkie-talkies are traditionally simple devices where having one person talk at a time is much less of a problem than going to the trouble and expense of enabling two-way talking. Modern digital communication technology is changing this." ]
[ 5 ]
[ [] ]
[ "url" ]
[ "url" ]
do5wgo
how Netflix/Amazon originals make money
Economics
explainlikeimfive
[ "f5k0rr9", "f5ky3b8", "f5k1k53" ]
[ "Subscribers like you and me view those videos and the monthly service charge funds that garb" ]
[ 10 ]
[ [], [], [] ]
[ "url" ]
[ "url" ]
6erry9
Why are there not a lot more farms?
Other
explainlikeimfive
[ "dicjb8p" ]
[ "Conventional farming is becoming more efficient, and making more farms means destroying natural biodiversity." ]
[ 5 ]
[ [] ]
[ "url" ]
[ "url" ]
hq8212
- Why usually, old items turn yellow with age?
Chemistry
explainlikeimfive
[ "fxwk96f" ]
[ "Well, most paper is made from wood from trees, and a major component in wood is cellulose. Cellulose is found in plants and is tough to break down, needing the enzyme cellulase - something but humans do not have. Besides cellulose, wood also contains a molecule called lignin, which helps with the structural support of the tree. Over time, lignin is reduced via the oxygen in the air, meaning it gains electrons. Lignin then breaks up into different types of phenolic acids, which all have a yellow tint to them. These acids also slowly degrade the cellulose inside the paper, which is the reason why old books aren't just yellow, but also very brittle." ]
[ 3 ]
[ [] ]
[ "url" ]
[ "url" ]
cv2p91
What is the chain reaction that allows investors to make money, from when a person invests in a company to the profit being made?
Economics
explainlikeimfive
[ "ey1het8", "ey23n13" ]
[ "This has a variety of answers depending on the exact circumstances, but in general: An investor gives money to a company in exchange for a piece of that company. The company uses that money in the process of doing business and, if the company is successful, they make more money than they use to run the company, which is the company’s profit. Because the investor got a percentage of the company in exchange for their initial investment, a percentage of that profit goes to the investor commensurate with the portion of the company that they own. The stock market is buying and selling portions of companies with the value determined in large part by how much investors think they can make by owning a piece of the company. Some companies pay out profits to stockholders. Some refrain from doing so in order to reinvest that money back into the company instead, but will still be seen as valuable on the stock market if the company is particularly successful as the potential exists for them to pay out on future profits or buy back stock from investors at some point for a good price. This means that it is also possible to turn a profit by investing in a company that becomes successful and is therefore seen as a valuable company to own a piece of, allowing the investor to sell their piece of the company for more than they originally invested." ]
[ 7 ]
[ [], [] ]
[ "url" ]
[ "url" ]
avv5l5
Why is the ocean around the Bahamas so turquoise?
Chemistry
explainlikeimfive
[ "ehhywtm" ]
[ "Because it's shallow. Less than a hundred meters in most cases. So you don't get that deep, ocean blue" ]
[ 7 ]
[ [] ]
[ "url" ]
[ "url" ]
9brkqf
When there's a corner with mirrors on both sides, why do you always see yourself in the middle of the corner?
Physics
explainlikeimfive
[ "e55b92a" ]
[ "Assuming that mirrors are at a 90 degree angle the light reflected from your body will always make a 180 degree turn. Light reflects at the same angle as it falls. So let's say a ray of light falls on a mirror at an angle of 60 degrees. Then it will bounce back at an angle of 60 degrees and fall on a second mirror at an angle of 30 degrees and bounce again at 30 degrees. That gives us 180 combined." ]
[ 5 ]
[ [] ]
[ "url" ]
[ "url" ]
6ot8y4
Why is there such a drastic mood change when the guy ejaculates?
Repost
explainlikeimfive
[ "dkk7ov3", "dkk1x11", "dkk1xts", "dkk9k7x" ]
[ "What you're referring to is often called the \"[refractory period]( URL_0 )\" which is (mostly) very short for women and (mostly) much more pronounced for men. This is just biology - while you can't blame guys (or girls) for how our biology encourages us to behave, we can obviously be aware of it and treat each other lovingly and sensitively, being aware of how our bodies and brains naturally work. I believe this should really be explained to all girls (and guys) about how our sexual behaviour is so different. It's been a bone (ho ho) of contention for as long as cultural expectations have existed. Simply put, guys' physiology - which *includes* our emotional responses - are wired to drive very very intense sexual attraction until orgasm, and then be able to go off and do something else, like resume hunting for wilderbeast. You don't want men spending all their time shagging, and not doing other important stuff like defending from predators and killing each other. We guys are simply not biologically wired to \"bond\" over sex as such. We do bond over other things - do some googling about what triggers *oxytocin* (the bonding hormone) in men. Sexually speaking, we are wired to try and be attractive to females (often by exhibiting valuable physical skills or social dominance) and pass on our genes to females as \"efficiently\" as possible. That said, culture of course does play an enormous role in how we behave, above and beyond the necessities. Even though guys' brains aren't rewarded for post-coital smooching, culture and personal learning can alter that \"default\" behaviour, to quite a large extent. So if your current guy isn't making a lot of effort, chances are he hasn't learned why he \"should\" (in terms of your expectations). If you're unhappy, communicate to him about it, or find someone else if that doesn't work. Once you understand the \"why\", the decision and your happiness (at least in modern culture) is up to you. If you live in a very male-dominated culture, sadly it might not be and men are less interested in changing their behaviour." ]
[ 63 ]
[ [ "https://youtu.be/Qymp_VaFo9M?t=284" ], [], [ "https://www.jlect.com/entry/2891/kenjataimu-kenjataimu/" ], [] ]
[ "url" ]
[ "url" ]
gnil8c
What is the body doing when you remember something that gives you butterflies?
Biology
explainlikeimfive
[ "fra2702" ]
[ "Memories are encoded differently, but usually the chemical response in your brain during an event is the easiest to store. Most memories exist in the form of a reinforced neural pathway, in other words your brain recognizes what direction a signal went and which cells it affected. On a slightly related note, this is why the movie trope of an impact to one part of the head causing amnesia is false. Memories are stored throughout the brain. Recalling something reactivates the same pathway that the original experience activated, which can result in similar physical reactions, although they will usually not be as strong, since the stimulus of a memory is weaker than an experience." ]
[ 4 ]
[ [] ]
[ "url" ]
[ "url" ]
5ri9yy
Why is space debris during interstellar travel at 35,000 miles/second + not an issue?
With all of the recent news surrounding interstellar space travel, one theme appears to emerge (the need for insanely fast speeds). We’re talking on the order of 20+% the speed of light. So let’s say theoretically, we (the humans) are able to accomplish this. Is space so empty, that nobody needs to care about floating debris? If we’re traveling at 35,000 miles/second+ we can sail away towards our goal for 20+ years and never hit stuff in between, how is this possible? What am I missing?
Physics
explainlikeimfive
[ "dd7g962" ]
[ "That's basically it, yes. Space is *unimaginably* empty. That's a literal statement, people just cannot correctly envision what 'infinite nothing' actually means. You could fly something the size of a cruise ship in a straight line effectively forever and not hit anything larger than a helium atom, as long as you pointed out of the plane of the ecliptic (i.e. 'up' or 'down' relative to our orbit of the sun and galaxy) rather than across it. That said, debris near to stars is a potentially serious problem; leaving our solar system and entering the destination one would need to be done at much lower speeds to avoid megaton-range explosions on encountering small bits of comet. You're not missing anything. Inside solar systems it's a problem. Outside solar systems, 'nothing much there' acquires a whole new level of accuracy." ]
[ 4 ]
[ [] ]
[ "url" ]
[ "url" ]
8nww1j
How does DRM work, and what made Denuvo so notoriously difficult to crack?
Technology
explainlikeimfive
[ "dzyzvsu" ]
[ "DRM tries to assure that contract terms are obeyed, usually by only decoding the data for legitimate users. Most designs are add-ons, there is code that says \"this use is OK\", and then most of the code just relies on that. It's a single piece of code to hack or trick. Denuvo works differently, [as explained in this post]( URL_0 ). It made developers port there code to Denuvo's DRM-aware environment. This eliminated the \"one check and you're done\" approach to hacking." ]
[ 3 ]
[ [ "https://www.reddit.com/r/CrackStatus/comments/43dgej/how_denuvo_works_and_why_its_so_hard_to_crack/" ] ]
[ "url" ]
[ "url" ]