Subset (10)

eli5 · 25k rows

Split (1)

train · 25k rows

query stringlengths 20 300	positive listlengths 1 1	negative listlengths 1 1
OLED burn in. We know how it happens, but why does it happen? Do pixels fade away over time or what?	[ "Yes pretty much, over time (and over use) the pixels age and their properties degrade. As long as all pixels are getting roughly the same use, you will not notice this, but you are actually getting the same \"burn-in\" over the whole screen. It's not necessarily a \"fade away\" though, they will lose max capacity...	[ "[In general the dot/shape pattern you see after passing a beam through a regular obstruction is the Fourier transform of the obstruction. This is basically the principle behind the various types of diffraction imaging: shine a beam through a crystal and it will diffract into a pattern of dark and light spots, with...
Why does cold weather smell different than warm weather?	[ "The chemicals which we smell have different tendencies to vaporize at different temperatures. Changing the temperature changes the mix of chemicals in the air, and by extension the smells you perceive." ]	[ "The molecules in the steel bind with the sulfur molecules left on your fingers from things like garlic and onions, and when you rub your hands against the steel under cold water, the molecules are washed away." ]
The Pussy Riot in Europe	[ "Pussy Riot are a Russian Punk band. Their music often says rude things about Vladimir Putin and the rest of his government. Now everyone knows 'sticks and stones' but Vladimir got sick of the musıc that said bad things about him so he said that they were not allowed to do that anymore. Pussy Riot then sang their s...	[ "ELI5 as possible: Kosovo scenario again. Meaning Albanians will take a part of Macedonia and make it a new state. And that was not a protest, but a terrorist attack." ]
How do phobias develop?	[ "childhood event(s) most likely it's a learned fear, that is essentially over learned you can put a baby in a cage with a huge snake or a lion or something and since the child doesn't know to be scared, it wont be you can put a grown man in a room with a tooth brush and that might be his trigger to run and cry like...	[ "Calling it a cold started because people used to believe that prologned exposure to cold temperatures, especially if it was also damp and you weren't properly dressed, is what caused a cold. This is where the old cliche of saying \"come inside before you catch a cold\" during fall and winter came from. Edit: This ...
What happens to liquids when you consume them?	[ "Your intestines absorb them. Pretty much everything in your system after your stomach is liquid. Ethanol is absorbed. Simple sugars in soda and juice are absorbed. water is absorbed. Lactose cannot be absorbed without being broken down. The things that cannot be absorbed or broken down becomes poop." ]	[ "You essentially create a battery in your mouth and cause an electric shock. _URL_0_" ]
What will double the energy do for the Large Hadron Collider?	[ "> what are they hoping to achieve if the particles are already moving at near light speed? Just to clarify, the actual speed of the particles is mostly irrelevant at this stage. Everything is basically going at the speed of light already, what's interesting is their energy. A particle's speed is capped at the spee...	[ "Which articles? There is a study underway at the lhc to determine if there are more dimensions than those we know of, I don't know about 'parallel universes'." ]
How did animals builders (like a bird building a nest) evolve their skills?	[ "Nest building is an innate behavior meaning it does not need to be taught by another individual. But it is also subject to individual variation as well as behavioral plasticity. So individual differences in this behavior can obviously be subject to natural selection. But there is this more complex part which is pl...	[ "They’re small and agile meaning there is less weight hindering fast movements. Also from the size perspective, I imagine it would look somewhat similar to our movements in terms of speed and range of motion (if that’s the right way to phrase it, could be wrong). In some it is quite likely aided by the threat of pr...
How “fit” were soldiers in the Roman Empire?	[ "Not to discourage any further answers, but you find these older answers to be informative: [What would \"boot camp\" and PT have been like for Roman soldiers around the time of the Punic Wars?](_URL_0_) by /u/Celebreth [I have just joined the Roman army, what is my life going to be like now](_URL_1_)? [People from...	[ "Kinda of an unrelated question, but did the ancient Mediterranean world have any vulgar vernacular (farts) or euphemisms for passing gas?" ]
Why aren't thermometers affected by windchill?	[ "They can be, if not kept dry. Humans are always affected because they have moisture in their skin (perspiration) that evaporates and causes cooling." ]	[ "One way is to look at air bubbles found in glaciers. Scientists are able to estimate when the ice was formed and the air trapped inside is exactly what the air was like when that part of the glacier formed. So by examining the composition of that air, they can make a pretty good guess to what the temperature was."...
Why is the term "ironic" so widely misunderstood and seems so hard for people to use properly?	[ "Largely because it has considerable overlap with two other concepts people seem to understand better. Because people know sarcasm is often just 'saying the opposite' and a lot of irony does happen to be when there's an opposite outcome from expectation, people can oversimplify that into thinking Irony just means '...	[ "Kind of like if you're looking through some legos for a number of different parts, you usually come across one that you need so your search goes quickly until there's one last part you need. It might take you awhile to find that last specific part. That explanation is probably wrong but that's what I would say to...
Someone asked a question I can't answer: "I was told the Victorians had a prohibition against religious profanity [e.g. god damn]...the justification for the taboo was they thought the profanity could actually physically hurt God. How did they come up with that?"	[ "There is no means by which one might justify that within Catholic or Anglican theology. What's the source for this allegation, beyond \"I was told\"?" ]	[ "The Viet Cong were very aware of the anti-war mentality of Americans. It was central to their strategy for ultimately winning, in fact. They believed that if they could bring the frontlines out of remote areas and in front of news cameras, the American public would object to seeing such slaughter. And it did work....
how is the weight that we lose excreted out of our body's?	[ "We exhale it. The fat is metabolized for energy, leaving water and CO2 as waste." ]	[ "You may have noticed that houses will have a pipe sticking up from the roof, typically over each bathroom. That's a vent for your sewage system, and it's tied directly to the drain pipe of your toilet. Pressure changes caused by wind blowing over this pipe makes the water in your toilet move around a little." ]
Why were allergies not as common as they are now?	[ "One theory is that [we're too clean](_URL_0_). By keeping our kids clean and not letting them chew on UFOs (unidentified floor objects), we're either preventing their immune systems from building a proper \"database\" of pathogens early on, or we're preventing them from coming into contact with symbiotic species t...	[ "You may be interested in our FAQ section on [PTSD Before the Modern Era.](_URL_0_)" ]
Would a perfect two-way mirror sphere eventually fill up with a finite number of photons?	[ "Of course this would never happen. No mirror is perfect and quickly looses light from interactions on the surface. Thats not even mentioning getting light in. If it was possible: A. Only 1 specific comb of frequencies could live in it because it was a cavity resonator and everything else would destructively interf...	[ "Grab a tennis ball and a lamp. Turn off every other light in the room. Hold up the tennis ball. Half is lit, half is dark. If you are looking from the side (you can see the lamp and the ball) you can see some of the dark side of the ball. The ONLY way to see nothing but lit ball is to have the lamp directly behin...
If water goes down a plughole in opposite directions on opposite sides of the earth, is there a point/location where it switches? I.e. goes neither way and falls straight down	[ "No it is a myth, this doesn't actually happen it has been perpetuated by many websites emails etc. but the Coriolis effect doesn't happen in plugholes ." ]	[ "It's arbitrary. Before cars were invented, there wasn't a set way to go --- on a super-busy street in a big city, lanes would naturally tend to develop. But otherwise it was pretty much a free-for all, because horses are smart enough not to crash into each other 99.9 percent of the time. You can check out old pict...
How fast does cells and bacteria move inside your body?	[ "Im gonna talk about immune cells like macrophagrs and neutrophils because human cell motiliy is a more difficult subject. The cells themselves that do move don't cover a lot of distance on their own. Even a 'fast' cell is tiny. This is one of the reasons we have blood! It conveys your absorbed nutrients and oxygen...	[ "When you swallow something, it's already partly broken up by both chewing and saliva. This makes it easy for the chemistry lab that's in your stomach to examine everything that lands there, and to arrange for the rejection of what it doesn't like. It's a bit more complicated than that, but I'm trying to explain it...
How do you solve this GRE sample math question?	[ "> more than twice as many means that the number of X employees, Nx, is greater than 2 times the number of Y employees, Ny: Nx > 2*Ny The arithmatic means are: (1) Mx = SUM(Sx)/Nx = 25k (2) My = SUM(Sy)/Ny = 35k Where S is the salary of employee i and the sums go over all employees in the respective department...	[ "You know how authors write long stories using letters and words and the rules of grammar and writing? Its just like that. With enough knowledge of how to read (math), these kinds of explanations make sense. Dont feel bad that you cant read it. Its just like if you tried to read a story in a language you dont know....
Why do journalists say the word Latino, and Hispanic names with a Latino accent? They don't say BBC correspondent Katty Kay with a British accent, or Chancellor Angela Merkel with a German accent. What gives?	[ "They over-pronounce things to seem smarter and more cultured. Unfortunately, the trend I've noticed for the past couple years is that the browner the topic (meaning the people's skin color), the harder the accent. No one says \"Musk-VA\" (Москва) instead of Moscow. They don't say Oslo like /ooshlo/ (one pronunciat...	[ "A visa is permission to be in the country for a specific period of time for a specific purpose. So you can get a tourist visa, a student visa, or a work visa, etc.. If the purpose for which you got your visa expires, you are supposed to leave. For example, if you came on a student visa and quit school after a few ...
How do programs like Google Translate recognize handwriting so accurately?	[ "I'm not sure which algorithm(s) they use, but back in Uni I had an AI class where we did a small program to identify user inputted letters using an neural net algorithm called \"Perceptron\". In this small program, there was a grid (2 states per cell) which allowed the user to \"draw\" the \"standard\" or \"normal...	[ "They crowdsource it. They are using data from any Android user who has not opted out of giving traffic data. Here's their explanation: _URL_0_" ]
How come when I take a shower/bathe in plus-100 degree water it is enjoyable, but not plus-100 weather?	[ "As someone in a country that uses Celsius, I was very confused. But in all seriousness, additional question: When you are in +100 degree weather, you sweat like a pig. Does the same happen in the shower?" ]	[ "Your metabolism's job is to regulate the temperature of your body. \"Metabolizing\" food is basically like setting it on fire in your body and using the heat for energy. In the extreme heat, your body temperature is already high. So your body doesn't burn the energy it has as aggressively (your metabolism slows d...
When make the gas pump run without you having to hold it, how does it know when your tank is full and to turn off?	[ "Because of a concept called venturi pressure. Basically it works like this on a gas pump. When you're filling up the air in your tank gets replaced by gas, so there's basically an outflow of air from the tank. This air diverted into a small pipe in the gas nozzle and it in turns keeps the handle open as you squee...	[ "It’s based on the price of oil. The price of oil is based on a lot of things, but simply put, supply and demand. As the global population grows, so does demand. As technology advances, so does supply. Depending on which of these is progressing faster you’ll see the price of oil and therefore gas change. Furtherm...
Why is battery still required for the car's engine to keep running?	[ "During the operation, the battery just serves as energy storage in case electrical demands exceed the output of the alternator at any given time, which is rare. But in most cars, the alternator (which converts mechanical energy to electrical energy) is connected to the belt. If the belt snaps, no electricity is ...	[ "Imagine a bathtub full of water, the water represents electricity. The bathtub has a faucet, which represents the generation of electricity. Imagine now that there are little holes in the bottom of the bathtub, all plugged up. When ever a home needs power, unplug the drain and let the water flow out. Now imagine ...
Do animals actually understand us when we speak or is it just anthropomorphism?	[ "They do understand body language and tone. And depending on the animal and breed, they can learn between 30-90 words (more for mimicking species like parrots). Now, thinking that an animal understands you when you say something like \"Good morning fluffy, you ready for a ride to the vet?\" In most cases the only t...	[ "Sort of. As you can see in Jurassic park 3, they can find out the shape of the voice box and get an idea of the nature of their vocals. They probably couldn't work it out exactly, and a lot of Jurassic Park is sort of filled in gaps." ]
How is time an illusion?	[ "Saying \"time is an illusion\" as a quick throwaway statement is just metaphysical wanking. That's fine if it's in a philosophy course, mind you. If you're looking for a more science-based explanation though, and considering the subreddit I hope you are, time isn't an illusion. You can quibble about the details wh...	[ "Im pretty sure its because you actually fell back asleep those moments it seems to go by in a flash... because you lost consciousness." ]
Can someone explain how erasers work LI5?	[ "The graphite that comes from the pencil likes to stick to the eraser more than it does to the paper." ]	[ "Non smart person here. My guess is it has something to do with light bouncing off particles in the air. Which is the reason why less light reaches the target. Because. of the dust and dander and other air born things absorb some and reflect the rest in different directions and those are the light rays we see." ]
why is melted cheese so stretchy?	[ "Cheese consists largely of long proteins (mainly casein), fats, and moisture. At colder temperatures, the casein interacts strongly with other casein molecules, like a crowd of people holding hands. These interactions make a cheese fairly solid at lower temperatures. However, when you heat the cheese, the proteins...	[ "I would guess thermal expansion for the led tv. It takes a while for things to cool down. Also add in the fact it is usually cooler at night. As it cools, the plastic will shift a little." ]
I live in the USA in 1970 and I want to buy some beer. How much selection is there? What brands are the most popular?	[ "To follow up on OP's question: was there much regional variation in selection?" ]	[ "BAt the time, it did vary state to state until the 1830's-1854 period known as \"Jacksonian Democracy\", where massive expansions of voting rights were undertaken. At the time of the ratification of the Constitution however, in Massachussetts and Kentucky for instance you had to own land to vote. Obviously you had...
why do comets take a sharp turn near the sun instead of continuing past it a longer distance that's more equal to their voyage toward the sun?	[ "The main issue is how much angular momentum they have with respect to the sun (or other body being orbiter). Starting from a great distance away they have time to accelerate a lot toward the sun from its gravity, but they don't have the momentum to the side to form a roughly circular orbit like the planets do. As ...	[ "A long time ago in places like Greece, Rome and even before that in really, really long ago places like Sumeria, and Egypt people made up stories about the stars/planets and the pictures they thought groups of stars made. These stories were usually about beings they considered to be gods or demigods (the word demi...
How did the first sexually transmitted diseases begin?	[ "It began as a pathogen with a hospitable host that was conducive to both development/evolution of long incubation periods, and the ability to jump hosts through exchange of bodily fluid. In theory there could be much worse STD/STIs, but thankfully they damage/kill the host before they can find a new one." ]	[ "> Why do they call prostitution the \"oldest profession in the world\" when it probably isn't? Actually, it probably is. We can even observe female apes and monkeys who trade sex for food." ]
How can ants count their steps? We've developed numbers as a system of organization and measurement, so we can literally speak "1, 2, 3" but how can an insect keep track of the amount of steps it has taken?	[ "The authors of the study that I believe you are [referring](_URL_0_) to weren't sure what internal mechanism is guiding it. And this paper was put out nine years ago and I don't see anything on it since then. However insects and animals in general are capable of doing things we think have to think about (counting ...	[ "You go into autopilot, your brain doesn't take logs unless something interesting occurs, but while you're in autopilot you are still actively scanning the road and controlling the car and responding to routine inputs(stop signs, road markings, corners in the road) Once you do a task enough your brain makes an auto...
Why is more than 8 hours of sleep a bad thing?	[ "Those recommended hours are just an average. There are always going to be some outliers, but that doesn't have to mean those people are unhealthy. In general, people who are unhealthy will need more sleep. But in those cases, it is not them sleeping more causing their illnesses. It is their illnesses making them n...	[ "It's not really. Bruce Lee ate 5 smaller meals a day. Our ancestors would graze lightly and then have a larger communal meal around the hearth at night. Hobbits eat around 6 meals a day, not including snacks. Three meals a day really just fits into our busy lives. It became the norm as we become more industrial ...
How does the US have Trillions in debt but is still considered wealthy?	[ "> Also, how is the US able to operate with such debt and how come other countries don't ask for their money? They do, of course. The US has debt structured with many entities. These structures include payment timeframes. The US pays on those time frames. It does not simply generate debt and sit on it. Nor does it...	[ "Your information is wrong. We are 13th on the list. _URL_0_ If you can't take the time to check your facts, please don't post." ]
why do jumping spiders move like robots?	[ "the jumping spider is much like a modern robot because of the way it changes the body fluid pressure in its limbs inorder to jump. just like how a modern hydrolic system changes its fluid pressure." ]	[ "The dance language is universal but there are regional dialects. While the specific parts of the dance language are the same, such as the waggling of the abdomen to represent distance and the the angle of rotation to represent direction, the exact translation between waggles and angles to specific distances and di...
why we perform lobotomies and extreme medication instead of euthanasia	[ "We don't really do lobotomies anymore. \"Corrective\" neurosurgery has advanced significantly in recent decades and non-destructive techniques such as deep brain stimulation are much more common. Likewise treatment with drugs has advanced greatly as well. The aim is not to make a person 'manageable' but to enable ...	[ "To quote an earlier post: > Massive amounts of paperwork and bureaucracy go into an execution, not to mention last meals, housing, death row, phone calls, last requests, etc." ]
Atoms have roughly the same number of protons and neutrons. How much of a coincidence is that?	[ "It's not a coincidence at all, it's a fairly straightforward result. The Pauli exclusion principle doesn't allow identical fermions of occupy the same quantum state. So if \|N - Z\| is sufficiently far from the values for stable nuclides, it becomes favorable to turn protons into neutrons, or vice versa, in order fo...	[ "The P=NP problem is basically asking \"Is it just as fast to solve a math problem as it is to check the answer?\" P and NP are a couple ways mathematicians talk about how fast certain kinds of math can be done. Some think these might be just as fast as each other, but they haven't managed to prove it one way or th...
Can a country use another country's currency? What would be the consequences?	[ "This actually goes on a lot in South American countries. Their currency is not that stable which means that family savings are shaky. What families do is buy American dollars since dollars usually is stable. In the same way countries can put their money into investments, however to be able to buy large sums of a ...	[ "Imagine that you have 10 pieces of silver in your pocket. Now, you take those pieces of silver out of your pocket and you cut them all in half. Now you have twenty pieces of silver, but really, you don't have any more silver than you did before, it's just in more pieces. Printing paper money basically works the sa...
Why does the temperature decrease as you get higher up towards the atmosphere?	[ "It’s colder because at a higher altitude the air is much less dense, meaning there are much fewer particles per cubic meter of space. Since solar energy or heat from the sun is primarily trapped by bouncing between atmospheric particles, the thinner air at high altitudes can’t trap heat as well and so it’s cooler ...	[ "Imagine you build a spherical shell around the sun, just bigger than the sun itself, and that the shell is absorbing all the incident radiation. Each square-meter of this shell would be receiving a very large amount of power from the sun. Then imagine you double the radius of that shell. Now, because its surface a...
what is short selling?	[ "khanacademy explained this really succinctly, so ill be even briefer. Basically you ask a persons broker if you can borrow a stock from that person, the broker says yes and so you now owe that person a stock. You sell that stock immediatly and then the price of that stock goes down. Now you buy the stock back at a...	[ "If you don't have even a 5 year olds level of understanding then why do you want to get into it? If you are actually interested then I can explain some of it, but you won't make money, trust me." ]
How do electrons have energy to constantly move around?	[ "It does not cost any energy for an electron to stay bound in a constant atomic orbital." ]	[ "The [glycocalyx](_URL_1_) plays some part in this. Essentially, sugars and proteins in the cell membranes protrude out and carry charges with them. These can be organized in such a way to keep cells appropriately distanced from each other so that they don't fall apart or merge. There may be other factors, but thi...
I want to use my car as a generator. If I'm parked, how much power can I get while idling? How about applying different levels of gas?	[ "This is a bad idea, especially because small generators are so cheap. Your alternator is probably good for 65 to 100 amps, meaning all you'll ever get out of your V6 or whatever is 1200 watts or so. A 1kW actual generator will set you back a few hundred dollars, work better, use less fuel, etc." ]	[ "The electricity that comes out of a wall is called AC (alternating current). That means that the electrons shift back and forth and alternate directions. If you coil a wire like a slinky and run an alternating current through it then it has the ability to create an alternating current in another nearby coil of wir...
Question about relativity.	[ "You're right, they'll both see the other slowed down. And they're both right. The thing is though, unless they turn around to meet back up, it doesn't change anything physically/logically. And if they do turn around, they must accelerate, which breaks the symmetry of special relativity" ]	[ "They age at the same rate just not relative to us. If you where going 95% the speed of light then it would still take 1 year before your next birthday. However from someone that is going considerable slower you will be aging slower. by the time that your 1 year is up hundreds of years will have passed from their v...
Why is porn arousing to us? Why does other people mating turn us on?	[ "Because it is human imagination. Porn isn't just watching two people having sex; it is a fantasy. We are putting ourselves into one of the positions. This is why people tend to like porn that they like to do themselves." ]	[ "I'd probably go for how high-calorie food tastes delicious. Obviously in a natural competitive environment, food's not readily available, and so the sense of taste evolved to enable identification of high-calorie food (as well as identifying bitter poisons) so you can find the best possible food to keep you from s...
Why is it that when you sleep, having a leg out from under the covers helps to regulate your body temperature better than having your entire top half uncovered?	[ "Capillary action, and your legs have this giant artery called the Femoral Artery. As the blood moves through the leg and foot (that is uncovered) it is cooled by the outside air easier, and returned to the body a bit cooler. With the capillaries spread over the feet, and skin it gets more surface area to cooler ai...	[ "Kirchoff's law of thermal radiation says, more or less, that bodies that are good absorbers (darker) are good emitters of EM radiation. Good reflectors (lighter/mirrors) are poor emitters of EM Radiation." ]
Why is it that companies like GameStop haven't gone the way of Blockbuster and MovieGallery even with similar digital distribution for both materials?	[ "You're comparing apples and oranges. Gamestop sells video games for consoles. Blockbuster, Netflix, and MovieGallery rent movies (and Netflix beat out the others because of digital distribution, like you said), and Steam sells video games for computers." ]	[ "You are having a date at a restaurant. You want a soda while you are in the middle of a meal. Will you get up and walk to the McDonalds a block away to buy a large soda? Competition is a thing but it isn’t just competition for a product, it also involves convenience." ]
What's the best thing to do if you're going to be hit by a car?	[ "Interestingly, the speed limit is set to 30 in most urban areas because a collision with a pedestrian at this speed has about a 10% mortality rate. If the car is instead travelling at 40 mph, the mortality rate jumps to like 70%+. So get hit by a slow-moving car. EDIT: misremembered the numbers -- the mortality ra...	[ "Meanwhile on BirdReddit... Why do big hunks of rolling metal squash thousands of us every day for no reason?" ]
Why aren't Arabs black?	[ "No selection pressure, particularly. The two below answers are basically correct - they weren't black to start with, and they stay out of the sun. Between them, that means there is no significant advantage to being darker and no genetic hypermelanism to inherit, so the average colour of the population doesn't chan...	[ "But they are: [Source 1](_URL_0_) [Source 2](_URL_2_) [Source 3](_URL_1_)" ]
If I am moving in a jet that is going faster than the speed of sound, is the aircraft silent because the would be sound is now behind me?	[ "No, because the air inside the jet is also moving at the same speed as you and you can still hear all the sound it carries. You are moving faster than the speed of sound relatively to a fixed point, not relatively to everything. Relatively to the air inside your aircraft you are standing still, thus you can hear e...	[ "There are two things that are going to have an effect here. 1) Doppler effect (which depends on the relative locations of you and the stationary observer) 2) Relativistic effects (time dilation primarily) In any case, the effects will likely result in the fact that the radio reciever won't even recognize your sign...
Is there a need for a larger particle accelerator?	[ "> Do bigger accelerators mean better results? In general, \"bigger accelerators\" means higher intensities and higher energies. These are the two basic things we need to push the limits of our understanding. On the frontier of particle physics, you need higher and higher energies to look for new particles which ha...	[ "We aren't really sure why, but it doesn't seem that something like that can be done. Think about it like your bladder; you can build up a need to urinate, but you cannot urinate so much that your bladder is more than empty." ]
I just watched a NOVA episode on Ulfberht viking swords. There doesn't seem to be much about them elsewhere. Does anyone know a bit more about them, and maybe others like Ingelrii swords?	[ "do you have a link of the name of the episode? I'd like to see that." ]	[ "Current practice in Anglophone scholarship is to use the standard name if the person is well enough known to have one. We say Charlemagne, not Carolus Magnus or Charles the Great. We say Joan of Arc instead of Jehanne d'Arc. Note that this does not always mean the common term is English--Charlemagne, for example, ...
Why, if internal body temperature is 98.6, people seem to be most comfortable in 70-80 degrees (F)?	[ "The body produces heat, just like any machine. Excess heat needs to be removed in order for things to stay optimal, but humans don't have radiators and fans like cars and laptops. It's comfortable for us because between 70 and 80, your body can get rid of just the right amount of heat to keep its self at the right...	[ "The pain relievers available over the counter are either NSAIDs (like aspirin, ibuprofen, naproxen) or acetaminophen (aka paracetamol or Tylenol.) Both act in some way to reduce the effect of a group of enzymes called cyclooxygenases (COX) which are important in producing inflammation. NSAIDs inhibit COX all over,...
How do lung x-rays work, if you can only see bones with an x-ray?	[ "X-rays show a lot more than bone! They show density of everything inside of you. Bones are the thick and easy to get a nice X-ray of but all your organs show up as different types of shadow. Lungs are made of a thin tissue and should be full of air so you can’t see them on X-ray very well when you’re healthy. But ...	[ "the yellow part of a cigarette is a filter. the smoke coming out of the burning end is the smoke that is straight up from all of the chemicals. this is why second hand smoking is considered more dangerous than regular smoking, it would make sense as to why you cough from the smoke on the burning end because of thi...
How do we know how far an animal can smell or hear something?	[ "You start with a reward based system. For instance; every time they hear a bell, a treat appears in the bowl across the room. Once they finally understand that sound = reward, you simply move the source of the sound further away until they stop noticing and take note of the distance. For sight it's a similar proc...	[ "The question is asking you to examine your belief in events without absolute proof or evidence. Logically, everything in your life's experience tells you that it will make a sound, but you have no way to prove that it will. In any issue, some things have to be taken on faith." ]
Why can't I taste the inside of my mouth?	[ "Neural adaption. Basically, your brain only cares about a change in stimuli rather than every stimulus that comes along. Your brain knows how to ignore a stimulus if it isn't changing. So, if you are tasting/feeling the same thing all the time, your brain is going to ignore it." ]	[ "At the heart of the minty matter is a protein called the transient receptor potential cation channel subfamily M member 8 (TRPM8), which is expressed in sensory neurons. TRPM8 is an ion channel, a type of protein that regulates the movement of ions across the membranes of cells. Just like only certain keys can ope...
Was there a fight to make high school education free?	[ "I'll just talk about public school system in America, since I don't know where in the world you are, and because in some places high school education isn't free. No, high school has not always been free. While the first \"American\" [secondary school](_URL_3_) was founded in 1635, the free public school system ...	[ "For a much quicker and less nuanced answer than thegeneralstrike's, do you mean specifically that history is a product of class struggle, and that human society progresses through the stages of primitive, ancient, feudal, and capitalist economies (and by \"human\" we mean \"European\")? That isn't really taken ver...
How much radiation does a luggage scanner deliver vs say medical x-ray?	[ "She should be save, although she might get more than 1 millirad since she's quite a bit larger than a typical object inside those scanners. Wgen you see the shielding at the entry and exit it is quite obvious they can not emit a lot of radiation. _URL_0_ \"The radiation dose typically received by objects scanned ...	[ "They don't. And...preventing the movement of illicit drugs on the scale you can place in your carry on and not get flagged for shear volume is simply not a priority for the TSA." ]
Why do individual people have distinct scents?	[ "Everyone has a different and unique biome. That is a large amount of bacteria that are responsible for things like breaking down sweat. We also have scent glands like many other mammals. The human nose may not be sensitive enough to consciously differentiate but other animals like dogs can tell people apart by the...	[ "Bacteria on/in your skin metabolize the minerals in your sweat and create a by-product. TL;DR: sweat is bacteria farts." ]
What factors cause the cake batter to change from liquid to solid?	[ "Most baking is about the gelatinization of starch (from flour). This is what forms the crumb in bread and firms up the foam structure of cakes (the foam coming from the action of leavening agents like baking soda/powder). Each little piece of flour is basically a tiny starch granule. When it is heated sufficiently...	[ "Let's take plan old white glue for an example. It is a bunch of sticky stuff in water. When the water evaporates, the stuff that's left behind is frozen into place. When it's in the bottle, there's nowhere for the water vapor to evaporate to, so it stays wet and sticky." ]
In 1999 we played Quake 3 at 120FPS - why is it such a big deal now that games like Farcry reach 60FPS?	[ "[Quake III looked like this](_URL_1_) and ran at, what, 800x600 max? It also had very little by way of a physics engine for anything other than the player characters. [Far Cry 4 looks like this,](_URL_0_) and runs at 1080p (or higher!). It also simulates real physics for every object you see on screen." ]	[ "Fracking is a technology that uses water pressure to create fissures (tiny cracks) in shale rock formations that allow oil and gas to flow up the well for collection. (since it is lighter than water) A lot of people are against fracking because it can potentially destroy the local communities way of life by creati...
- If exercise is suppose to make you physically healthier, why is it so common for athletes to get muscle and bone injuries?	[ "Because sports isn't for injury reduction. It is maximum performance regardless of injury. They train limit to injury, the athletic performance causes injury which would be worse with no training under their belt. Additionally, getting hit by another fit athlete isn't exactly safe." ]	[ "Several things. On an installation level, each program you install adds 'weight' to the operating system by giving it more tasks. These aren't always removed cleanly when you uninstall, which makes it important to reimage your computer about every year. Additionally, if you use a standard hard disk drive, the driv...
Why does the letter 'a' look different, in default computer fonts, from the one we write?	[ "[15th-century Italy saw the formation of the two main variants that are known today. These variants, the Italic and Roman forms, were derived from the Caroline Script version. The Italic form, also called script a, is used in most current handwriting and consists of a circle and vertical stroke. This slowly develo...	[ "Processing power. Your IPhone may be good and a marvel of miniaturization, but it isn't nearly as powerful as your laptop. The laptop can process all of the complex images and ads far faster than your phone can because your laptop processes everything faster." ]
Are there any non-Greek accounts of the Persian Empire, from a third party?	[ "Other than the Greek and Persian sources, I think the only decent account of the Achaemenid Persians would be in the bible. However, it might be worth checking out \"The Persian Empire: A Corpus of Sources from the Achaemenid Period, Vol. 1\" by Amélie Kuhrt which would almost certainly answer your question." ]	[ "I'm not familiar with that claim. Where did you hear it? I know Herodotus claims Phoenicians sailed from the Red Sea to the Levant coast. Is that what you're talking about?" ]
I am looking for a good Bio of George Washington	[ "I really liked Ron Chernow's \"Washington: A Life\". _URL_0_ ***** McCullough's Truman bio is awesome, BTW. I don't buy many books, preferring to read them for free from the library, but when I finished reading it, I went right out and bought a copy, just so I could have it on my shelf." ]	[ "Not all of the books have been published, but you might want to check out the Oxford History of the United States: _URL_0_ Many of them are also on audiobook, if that's of interest." ]
Is the act of overeating in itself bad?	[ "Gaining weight is just one unhealthy aspect you can develop from overeating. You can have poor health and still be skinny from a bad diet." ]	[ "For everyone that eats 5 plates there are people who went to a buffet had a plate and then realized they were not as hungry as they thought." ]
[String theory] If energy is simply vibrating 1-dimensional points, what powers these vibrations?	[ "You need power to make changes. Something can vibrate forever without power. Assuming there's no loss" ]	[ "Imagine a bathtub full of water, the water represents electricity. The bathtub has a faucet, which represents the generation of electricity. Imagine now that there are little holes in the bottom of the bathtub, all plugged up. When ever a home needs power, unplug the drain and let the water flow out. Now imagine ...
how does Plan B and similar emergency contraceptions work?	[ "\" Pregnancy doesn't happen right after sex. That's why it's possible to prevent pregnancy even after the fact. It can take up to six days for the sperm and egg to meet after having sex. Emergency contraception pills work by keeping a woman's ovary from releasing an egg for longer than usual. Pregnancy cannot happ...	[ "The government was overthrown and everyone was like \"yaay democracy\" but then everyone remembered they had different opinions. So now the more extreme groups are like \"omg totally our time\" and being all extreme and shit. Thats how I would explain it, as I understand it, as quickly as possible." ]
Why does the sun appear to move visibly quicker at sunset and sunrise?	[ "Because you have a fixed object (the horizon) as a reference point. When the sun is high in the sky, it's hard to tell how fast it's moving because there's nothing around it. When it gets close to the horizon, it's easy to see its motion compared to something else that's not moving." ]	[ "If you are going somewhere for the first time you are devoting a lot more processing power to following directions and looking out for signs/landmarks, etc. That makes time and distance seem greater. There is also the anticipation of some event/experience to keep you mind working hard; again creating a feeling of ...
Are there more than 3 "conventional" dimensions?	[ "So... imagine you have an orange and a cardboard tube, and the orange just barely fits into the tube. If you put the orange inside the tube, you may notice that from the right angle, both of these shapes look like a circle, but from any other angle you can tell that they're different. Mathematically, what I'm gett...	[ "Quoting [Wikipedia](_URL_0_) (a bit naughty, but it's a nice way to express what I think): > The proposed theory is inconsistent with quantum mechanics and critics have ruled it out on those grounds. Which is essentially saying what you pointed out, yes. If what they're doing is as easy as it sounds - just runnin...
Do minor head injuries damage the brain?	[ "It can. Current research points to more brain trauma from multiple sub-concussive injuries than actual concussion. _URL_0_ It really depends on how hard and how frequently you hit your head." ]	[ "I'm not sure it's very well studied, but from personal experience there's a reason they're called \"entheogens\". [This](_URL_1_) may have some of the information you're looking for; it cites a study showing that connection between disparate brain regions increase during magic mushroom trips. [This](_URL_0_) looks...
How was Charlemagne so effective at conquering such a large part of western Europe?	[ "One thing to keep in mind is that the Frankish Kingdom had long ruled over large parts of western Europe - see this map: _URL_2_ Charlemagne's conquests on there are Saxony, Bavaria, the Lombard Kingdom, Carinthia, and the Spanish March - a substantial conquest, to be sure - but the bulk of his empire was already ...	[ "many political assassinations could be linked to him? Think the answer may be in the question if you control the media and the legal system you can get away with nearly anything." ]
Does opening a window during wintertime make you sick?	[ "\"Flu season\" peaks during the winter months for a reason. The virus actually stays floating in tiny droplets for much longer under low humidity conditions. When it's humid, those flu-containing droplets get larger and fall to the ground more quickly. So perhaps it's more important if you go from high humidity to...	[ "It is supposed to be a natural reaction that our ancestors used to survive. It would keep them away from the nests of dangerous insects such as termites. It was the body's way of trying to avoid the danger and keep alive. If you believe in evolution you could say that it is part of evolution." ]
Why do parents use jealousy tactics to make babies eat, how does this work?	[ "I don't think that it's jealousy tactics but merely making the baby feel comfortable to know that the food is safe to eat. Adults do it all the time when testing a foreign food. They hesistate until someone they know takes a bite and didn't throw up before they try it out themself." ]	[ "commercialism. if you were happy with your old stuff, you wouldn't need to buy new stuff. all the designers and manufacturers come out with new looking stuff and market the old stuff as ugly and new stuff as pretty in order to make money. our tastes are hugely influenced by others." ]
How long did we have the concept of internet before it was invented?	[ "Not my field, but the most plausible candidate I've heard of is Paul Otlet in the early 20th century: _URL_1_ _URL_0_ I disagree that his idea of \"electric telescopes\" maps clearly onto our idea of \"computers,\" as the second article claims, but Otlet definitely had the idea of a global information network (as ...	[ "Your asking essentially the chicken or the egg. Example, Did you stomach evolove first and create your brain and extremites to feed it. Or did your brain grow your stomach to power it. Har to say, as without something to feed the stomach, we would have no stomch. Without the brain to run everything, we wouldn't ha...
Can anyone explain why O2 has a lower melting point than N2?	[ "This is not a simple question. Ultimately it comes down to this: In Solid phase, nitrogen and oxygen don't really exist in a diatomic state anymore. In solids, there are no such bonds remianing - everything bonds to its nearest neighbors. Nitrogen's crystal structure is hexagonal close packed. Oxygen is Cubic. Thi...	[ "Pretty much all complex food tastes different in different conditions. Since much of our 'taste' is actually smell, I suspect that a huge amount of it depends on the proportion and composition of the volatile components. (this is certainly true for wines - consider how big of a difference temperature and glass sha...
Do pheromone colognes like Pherlure or PherX actually contain pheromones and do those colognes actually work?	[ "Chemist here. If it attracts poontang or just makes you more confident so you pick up more 'tang, I say it has served its purpose. The scientist in me, however, is tempted to call bullshit. Show me proof. PS: I've always wanted to incorporate the word \"poontang\" into a scientific discussion." ]	[ "Imagine every time you eat something, a large burly man appears in front of you and dances a burlesque routine. Without fail, this goes on for several years. Soon you fail to even think that this rotund mustachioed man is anything out of the ordinary. After all, every time you even begin to take a bite of somethin...
why swearing under oath would make you tell the truth..	[ "It doesn't make you tell the truth. However, the act of being sworn in is a formal acknowledgement by you that you are now under legal obligation to tell the truth. That is, if you are caught lying, you can be legally punished for it." ]	[ "Usually you must sign a contract in order to be paid \"hush money\". If you blab, then you are violating the terms of the contact and you should be required to pay damages, as proscribed in the contract. Since the damages might be 10X the payment, this is unaffordable." ]
Why is iced tea never dispensed cold at fast food restaurants like other drinks?	[ "some restaurants it actually is but 1) it sells better if there is a visual stimulus such as having a dispenser. 2) making their own tea is easy and MUCH cheaper than paying to have “Brisk” ice tea in a soda dispenser. This way they can brew their own and make more money. Source: was fast food manager in past li...	[ "The equation you posted is about the thermal energy change. (dT is temperature not time). The object in the freezer will cool faster because it has more convective heat transfer, temperature change due to a difference with the surrounding air. See [here](_URL_0_). You want to look at Q^dot not Q. Q^dot is the rate...
How do we keep communication with distant space objects?	[ "More info on the network: > _URL_0_ Voyager 1 is currently about 12 light hours away, so any communication sent takes 12 hours to reach voyager, and for voyager to reply again 12 hours to come back. For the rest, and I'm making a bit of a guess here, it works like any other communication, Voyager (and other far ...	[ "Most have a [relay phone](_URL_0_) in their homes - they use an interpreter. [TTY](_URL_1_) is also available on mobile phones, landlines, and in 911 centers." ]
Why are children more receptive to animated television shows and films than live action?	[ "As a kid, I remember it was easier to visually understand a cartoon. I'd watch after-school cartoons, and then the first live action show would come on (CHiPs) and I remember thinking... I don't really even understand what's going on in this show. The actors all looked the same, I couldn't understand what they wer...	[ "I think the responses you've got so far indicate that it isn't very reliable. The whole thing is based on a sample. A sample of people are given set top boxes that monitor what they are watching. This sample is then scaled up to the whole population with weighting bias added in so that they can account for the 'av...
What would £24 from 1664 be in today's money?	[ "I used the Measuring Worth calculator from [this](_URL_2_) website and got the results: In 2013, the relative value of £24 from 1664 ranges from £3,212.00 to £5,600.00. *A general guide is that in the early 17th century 1 English pence was roughly the equivalent of one English pound 400 years later. This means ...	[ "Hi there -- while we've approved this question, we would like to remind potential respondents of our [current events](_URL_0_) (AKA \"20-year\") rule -- it's fine to discuss events through 1997 (inclusive) and their effects, but not events after 1997. Thanks!" ]
- Arguments against flu shots/are they dangerous? Is there merit to the arguments against receiving a flu shot?	[ "No. Even if there are drawbacks to the flu shot, influenza kills an estimated 250,000 - 500,000 people per year. Reducing it's ability to spread far outweights whatever psuedo-science, conspiracy theories, and minor-risk of infection or whatever else people have against it." ]	[ "How do we continue to slowly get smaller and smaller architecture in processors? I guess I am trying to understand what limits the shrinking of architexture. Essentially, why cant architexture rapidly decrease in size faster than Moores law predicted? Sorry, if this is a super complicated answer, I just always hav...
Was the term punk used in an insulting manner before the punk subculture came into existence?	[ "To add to the previous commenters answers, 'punk' was also used amongst the American hobo-ing community decades before the punk subculture developed to refer to a youngster who was taken under the wing of an older hobo, often with sexual implications. Check out the final stanza of Harry McClintock's famous Big Roc...	[ "Most neighborhoods built after the 1950s, ie subdivisions in the suburbs, are built all at once. Meaning they will all be built within a year of each other and use 1-5 building plans. Homes built in cities or on privately owned lots outside the city limits that are not a part of a subdivision are built as the owne...
Why can't two snow flakes be identical?	[ "There is a difference between \"Can't\" and \"Unlikely to the point that it will almost certainly not occur in a measurable amount of time\". At a certain level of statistical insignificance \"Yeah, but it's possible\" is more rhetorical technicality than a counter argument." ]	[ "Let's say you want to travel to Chicago from Atlanta by car. Can you predict your exact position at any given time? No. You can predict where you are going to be in the next few seconds but as you look further ahead you lose accuracy. Sure, you could say, \"I'll be near Indy around 6pm on this road, but you don't ...
A device to "harvest" lost thermal energy from a burning candle - is this nonsense?	[ "Would it localize the heat better? Sure. Air is poor conductor, especially compared to the metal bolts, washers, and ceramic case. Is it going to retain enough heat to actually be useful. Almost definitely not. But it does seem like a good way to warm your hands on a candle without burning yourself. Of course, you...	[ "In an idealized setting, where one body orbits another in a perfect vacuum, no work is being done on either body (and thus no energy is consumed). Perpetual motion doesn't exist because the real universe is not such an idealized setting, but the error in this case is very, very tiny: the orbit of a planet around i...
How far would a bullet have to travel for it to be affected by the Coriolis effect?	[ "Not a scientific answer, but when I was a scout in the army our sniper section guys told me they compensate for it on north/south shots over 1000 meters." ]	[ "Fast internet and faster servers. Human reaction times are on the order of 100ms or so. Ping time, which is round-trip packet flight time is often on the order of half that or so. Round trip is therefore on the order of human reaction if you give the server a little time to do stuff. Also, the server only sends b...
war in afghanistan, iraq and what the US has to do with it	[ "Afghanistan: After the September 11th attacks, the United States determined Ossama Bin Ladin and his organization, Al-Qaeda, were responsible. The organization had a close alliance with the then rulers of 9/10ths of Afghanistan, the Taliban. The U.S. demanded that the Taliban government turn over OBL and expel Al-...	[ "Hi, I've approved the post, but just a note to you and potential respondents: this subreddit has a 20-year rule against discussing current events, so any answers will have to cut off at 1997. If you're looking for answers that can include 1998-2012, do consider x-posting elsewhere, eg. a foreign affairs sub like /...
How does the auto tune that we hear about making shitty pop stars sound good, work?	[ "Autotune take the sound wave of your voice, and changes sections to be closer to a specific pitch. If you were really close, autotune would do very little. If you were my dad , autotune would make you sound very very different." ]	[ "They 've got something like this _URL_0_ It has a lot of cameras on it, capturing every angle. Then, the video is processed so that you can turn your phone and change the angle." ]
Why exactly is air invisible?	[ "It's the other way around. Because the atmosphere is transparent to a certain range of light, eyes evolved to use those colors of light for vision." ]	[ "It really depends on what you mean by \"see.\" If you mean see with the unaided eye, then no we cannot. If you mean unambiguously detect and visualize, then we can. _URL_0_" ]
Did any culture outside of North America have an equivalent of maple syrup or maple sugar made from tree sap?	[ "Coconut and date palms (and a variety of other palms as well) have been used throughout South Asia and the Pacific Islands as a sugar source for some time. The process of production is essentially the same, though it's often taken further to the point where the sugar crystallizes, and the product (which you can fi...	[ "They might ask why westerners simply wipe their butts with paper. If i smeared excrement on your arm, would you be satisfied just wiping it off with some paper? Additionally, in my experience in Thailand, Lao, Cambodia and Vietnam they used a handheld sprayer in combination with toilet paper. Though i do not doub...
Why can our eyes sometimes see heat coming from air vents, and other sources of heat?	[ "It's not actually the heat you see, but the effect of the hot air. Hot air expands and becomes less dense than the cool air around it. When light travels between objects with different density, it gets refracted (the direction it moves in is changed). You might remember images of a laser pointer shot into a fish t...	[ "Do you have a fly screen over the window? If so what you are observing is a [Moiré pattern](_URL_0_) being projected onto the window. Essentially the light is passing through the screen and the light waves get split up and then interact with each other causing spots of superposition where some regions are darker a...
Why is it most of the time we can breath through one nostril just fine, while the other feels like it's clogged up?	[ "Because of the [nasal cycle](_URL_0_). Your body switches between the nostrils every once in a while (from 30 minutes to a few hours)." ]	[ "Because the mirror actually doesn't reverse left right. It reverses _front and back_ - as if someone pulled your nose out the back of your head. If you track the image from the wall behind you, you'll notice that your back is closer to that wall than your nose is. However, if you extend this analysis to your image...
Why do obese people's legs remain under developed?	[ "Well first, not all obese people have underdeveloped legs. If an overweight person is active and heavy, chances are they kick like a horse. Their core might be better developed than you'd think as well, since a lot of abdominal muscles act to keep the torso in line and that becomes more difficult when reacting to ...	[ "For starters the extra costs to the manufacturer and the customer are not worth it. And second saftey, they could be dangerous closing down on little children & even adults." ]
If you're tired of being constrained by "facts" and "science" in your answers, try /r/explainlikeimcalvin	[ "At first I thought it said /r/explainlikeimcalvinist This should be entertaining too, though." ]	[ "I'm not good at breaking things down to ELI5 levels but AFAIK sound is a wave that requires a medium to travel through in this case air is that medium. Sound will travel further in a more dense medium meaning the apparent volume will be higher. Air at night is colder than air during the day because the sun isn't d...
How long does it take massive particles to reach Earth from the Sun?	[ "Well, obviously it depends how fast they're going. According to the Wikipedia article on solar wind, they have an energy of about 1000-10000 electron volts. For protons, this puts them below 0.3% the speed of light (so over 40 hours travel), and 40 times as fast for electrons." ]	[ "In practice it depends on how accurate your measurement of speed is. That is, how many digits you are willing to consider. Mathematically you can work it out pretty easily. The answer is zero seconds. The top of a parabola is one point only, it has no extent." ]
Why music chords and scales the way they are now?	[ "A \"chord\" is made up of 3 or more notes. A note is a single sound, like when you whistle, that's a note. Sounds make waves, and that's what we hear. Imagine you're in a pool with water like glass. You gently tap the pool at one end with your finger, while a friend lightly taps the water at the other end at the s...	[ "I think you mean most movies, only like 1/4 are 4K today. 99% of tv is either 720p or 1080i as well. > Keep in mind, this was a 300m dollar production by James Cameron, known for using the most high-end gear to achieve the best images, so this was a conscious choice. 4K movies didn't exist until 2011, so it w...
What is the difference between being on Methadone as opposed to Heroin or other narcotic medication?	[ "According to the limited info I got from my wife (a nurse) methadone is a narcotic, but releases so slowly that it meets the psychological and physical needs of the addiction while not allowing any kind of high. The purpose of methadone is to slowly taper off the amount so the addiction is cured. Edited for gramm...	[ "MAC adresses are hard-coded into physical hardware devices (and cannot be changed) - sort of like the street address for your house. IP address are set in software and can be moved/changed - sort of like your phone number. When you call 911, the operator can tell what your address is because your physical address ...
Why do older generations look more mature and older at "x" age than current generations at "x" age	[ "Are you talking about when you look at a picture of your dad (for example) when he was 20, and compared to 20 year olds today, he looks more mature? It's probably just because of his style... the type of clothes he wore, how he wore his hair, etc. You associate that style with older people because it's the style o...	[ "Your question is like: > Why do people keep telling me to take a pill my doctor prescribes when in ye olden days people didn't have access to the same pills? Clean water is way easier to get now than it was then. Since you have access to clean water you should use it. In the same way, getting a doctor to prescri...
Ayn Rand and objectivism	[ "1. Reality exists as an objective absolute—facts are facts, independent of man's feelings, wishes, hopes or fears. 2. Reason (the faculty which identifies and integrates the material provided by man's senses) is man's only means of perceiving reality, his only source of knowledge, his only guide to action, and his...	[ "In 1992 North Korea removed all references to Marxism-Leninism from its constitution and replaced it with Juche (self-reliance). _URL_0_" ]
During Medieval Europe, how taboo was incest and homosexuality comparatively, and to what extent if at all?	[ "As for homosexuality: In Italian cities, during the renaissance (so technically not medieval), homosexuality was actually rather frequent, but still illegal. If I remember correctly, Michelangelo's descendant changed the pronouns from male to female in his sonnets before publishing them." ]	[ "You're going to need to narrow down your time frame here, keep in mind you're asking about a time frame of 1000 years over a very, very large area of land with vastly different cultures. You'll be more likely to receive an answer if you narrow the question down to a more specific time." ]
Was there any talk of gun control after the JFK assassination?	[ "You can bet that a lot of people were happy Huey Long was gone. That aside, there had already been a major piece of gun control legislation passed in 1934, the National Firearms Act. As for JFK, his assassination was added to assassinations of MLK, Malcom X, and RFK and was part of the impetus for the Gun Control...	[ "Hi, I've approved the post, but just a note to you and potential respondents: this subreddit has a 20-year rule against discussing current events, so any answers will have to cut off at 1997. If you're looking for answers that can include 1998-2012, do consider x-posting elsewhere, eg. a foreign affairs sub like /...
If cannibalism is bad for a species,what sense for newly-bedded black widows to eat their mate?	[ "The female needs the nutrients to develop the eggs, the male has (hopefully) impregnated the female so it's in his best interest that she is well fed, so he will pass his genes via the offspring. AFAIK usually male are weak and won't live long anyway, so is a win-win for both. Well, kinda." ]	[ "I think it might have some base i historical gender roles. The women in the village,cooking,weaving,yapping and watching the kids while the men are on the hunt,completely focussed on the kill/trail." ]

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