Subset (10)

eli5 · 25k rows

Split (1)

train · 25k rows

query stringlengths 20 300	positive listlengths 1 1	negative listlengths 1 1
...how much trouble are we in with the Ebola pandemic?	[ "If by \"we\" you mean Americans, not much. The CDC is controlling the two citizens that are infected closely, and our climate and lifestyle isn't really conducive to spreading the infection. If you mean everyone on earth, a little more, bit still not much; ebola doesn't spread as easily as a lot of other diseases,...	[ "i think they already took away his medical license. his career is over. what else would you do to him? the people who listened to him should take responsibility for being reckless." ]
why do lightbulbs unscrew themselves over time?	[ "Gravity and vibrations. Gravity constantly pulls bulbs down and vibrations from people walking around or trucks driving by is enough to help them move a little bit at a time. Over the years it's enough to work it's way out." ]	[ "Your question reminded me of this frikkin awesome documentary of about planned obsolescence. [Video snippet](_URL_0_), and the whole documentary, I can't find... but Im sure someone else may be able to. ELI5 version: Because companies want you to keep them in business." ]
is my phone eavesdropping on my conversations?	[ "the gf is knitting, talking about it a little bit. My YouTube account is loaded with knitting videos suggested. Never once in the life of this computer has knitting been searched on it. Every once in a while I give the camera the finger, someone is watching" ]	[ "Welcome to the tech era. If you're not paying to use the product, *you* are the product." ]
Does our heart muscle ever cramp up like the rest of our muscles? Is that what a heart attack is?	[ "A heart attack is a myocardial infraction, which basically means the heart muscles aren't getting enough oxygen to respire(contract) and stop working. If I remember correctly a cramp occurs when there is a high build up of lactic acid in respiring tissue, which is a by product of anaerobic respiration. But the fun...	[ "Look at it like a phone and charger. If you put a load of energy into the phone (more than it's rated for), it'll do serious damage almost immediately. If you use an underrated charger, it'll put only a little energy in, but the phone will use more than it's getting and eventually die. Heat is just a form of ener...
Why don't we ever get NEW swear words?	[ "We do, yet it is rare and are not always considered as true swear words. For example the word \"faggot\", never used to mean anything yet has reached the point of being a swear word. A swear word is, in essence just a word that has been given the power to offend people. I phrased it really badly, yet I think the p...	[ "We invent new sports all the time. My favourite is [Ultimate Taser Ball!](_URL_0_) Edit: [Video of people playing Ultimate Taser Ball](_URL_1_) and also the [Official Website](_URL_2_) of UTB." ]
The internet of things	[ "In short: the internet of things is about putting a tiny computer and internet connection into everyday objects. This lets you do cool things like program your coffee maker to start brewing coffee before you wake up, or having your bed record how well you sleep and sending that information to the fitness app on yo...	[ "The Tor Project is Awesome. If you can afford a VPN-That's better!" ]
In western strategy-historical games, cavalry beats archers beats infantry beats cavalry. In eastern games, cavalry beats infantry beats archers beats cavalry. Can someone explain how the difference in theory?	[ "Could you provide some specific examples of Western and Eastern games?" ]	[ "Similar question questions have come up a few times in this subreddit. Here's [one response I've given before](_URL_0_). The TL;DR is something like The opposite of patriarchal (male rule) isn't matriarchal (female rule) but egalitarianism. Many small scale societies are much more egalitarian, but here probably \"...
Why do male lions have manes and not just long hair over their whole body?	[ "Given that it only appears in male lions, it is very likely an example of [sexual selection](_URL_0_). Sexual selection often leads to pretty unintuitive outcomes, like the unwieldy feathers on a peacock. Lions live in a hot climate, so long fur seems like it wouldn't be helpful directly to fitness. So maybe femal...	[ "If you don't like spending more money than you have to, you'll only buy a car big enough for your needs. A bigger car is more expensive, and uses a lot more gasoline than a little car. You wouldn't buy a big SUV if you didn't need it. Lean muscle mass burns energy - it's expensive for our bodies to build it, and k...
How do “perimeter fires” help contain massive forest fires?	[ "You burn down a section of the forest surrounding the fire so that, when the fire reaches that already burnt out portion, it doesn’t have anything to keep burning." ]	[ "You may be presupposing facts that aren't really true- most of France was not heavily forested either before or during each world war. There were of course regions with more tree cover, most notably the Ardennes (which is mostly in Belgium), but by and large the norm was grassland or farmland." ]
What are the key differences between Knight Bachelor and Knight Banneret in the Medieval period?	[ "This answer is about Knights Banneret in England during the hundred years war. During the 14th century in England knights were allowed to fly a pennants (flags that came to a long tapered point) but were not allowed to fly a regular rectangular banner unless they were awarded the rank of knight banneret. It was a...	[ "Blind: The participants in the study don't know whether or not they're receiving the treatment being tested. Double-blind: Neither the participants nor the researchers know which participants received the treatment being tested (during the course of the experiment, in the case of the latter, they obviously find ou...
What is the difference between a decentralized trading platform and a centralized one in terms of crypto currency?	[ "Centralized: there is a \"main\" server (or group of servers) that keeps track of everyone's accounts. Transactions must be recorded there. Decentralized: transactions can occur anywhere, and no particular computer is the \"main\" one." ]	[ "Adding to other comments on weather modelling and data, it depends on where the raw data comes from. In Australia, the government weather bureau is not used by most popular weather apps - e.g. Apple weather, Yahoo weather and Android's default weather app. They use a service called Weather Underground, which crowd...
How did people deal with bad eyesight before glasses were invented? Or is it a modern problem?	[ "Rarely did poor eyesight prevent the worker from many jobs. Fine work would be done by others. Reading is a recent phenomenon." ]	[ "In The Recollections of Rifleman Harris, they walked, everywhere. I mean miles and miles and miles. All the time. That kind of constant movement will keep you trim. For example, when Harris enlisted, he walked to where his training and post were, then walked to port to take a boat to Ireland where he walked everyw...
Why do deaf people's voices sound different?	[ "When you speak, you constantly adjust the tone/pitch/etc of your voice. A deaf person can't do this, because they can't hear it." ]	[ "Sound works like numbers. If I give you 3 apples and you give me 5 apples back, I can just subtract 3 from 5 to know that you added 2 apples to the pile. If I play a sound while you record a sound, I can just subtract what I played from what you recorded to find out what you said." ]
What determines which areas of the brain are damaged during hypoxia?	[ "Generally the areas damanaged depened on two factors * metabolic demand * blood supply The first factor should be obvious. Neurons that have high resting metabolic demand are going to run out of energy first. Note that the brain depends on aerobic energy production and can't really get by like muscles do with an...	[ "From wikipedia: _URL_0_ > Reactions that take place on polar stratospheric clouds (PSCs) play an important role in enhancing ozone depletion. PSCs form more readily in the extreme cold of Antarctic stratosphere. This is why ozone holes first formed, and are deeper, over Antarctica. Early models failed to take PSC...
Why do the elderly often drive on the slower side?	[ "Slower reflexes make them few as if people in the \"faster\" lanes are driving \"too fast\". So, rather than be tailgated or passed on either side they drive in the slow lane. I wish slow driving younger people would follow this practice." ]	[ "They don't. It's a marketing ~~lie~~ gimmick. I used to work for a company that did a similar thing by mail. New customers were supposed to sign up by a certain time for special rates but as a specific matter of policy we'd give those rates to anyone who mailed back the special offer." ]
How different was spoken Middle English from the spoken English of today?	[ "Hi, the question of \"how far back could I go and still communicate in English\" is a popular one in this sub. Please check out this recent post, and do please follow the link therein to a few more on the Middle English period * [If I was to travel back to 12th century England, would we be able to easily understan...	[ "Not an answer to your question, but maybe of interest to you. There's an album by the group Sequentia (who specialize in early music) titled [Edda: Myths From Medieval Iceland](_URL_0_) In it they've attempted to re-construct what a telling of the Edda might have sounded like when it was performed. You can [li...
if hand sanitizer kills 99.99% of germs what is the .01% that can't be killed?	[ "It's just a way for those companies to cover their asses legally if some idiot gets sick and tries to sue because be thought his hand sanitizer was killing all the germs on his hands." ]	[ "I can, if I want to be an asshole, continually add to the \"There's no one sitting next to you on the bus\" statement to make it impossible to prove. He's invisible. You can't touch him. He actively changes his own properties to prevent detection. In that case proving a negative has to do with extremely broad abso...
How come it snows metal on Venus?	[ "Hey man! I made a quick [video](_URL_0_) to answer your question! If you don't want to watch it, here's a summary of what the video covers: - It's very hot on venus, the plains can reach a very hot 480°C which makes all the metal in the atmosphere vaporize! - The vaporized metals then rise up in the air, and cool ...	[ "because of left over chemicals from the plastics and the leather or faux leather treatments are evaporating into a mostly sealed environment" ]
Why is the moon receeding and not approaching the Earth?	[ "Because of [tides](_URL_0_). The tides cause Earth to spin slower and the Moon to move farther away to conserve angular momentum. Given enough time, they would become tidally locked and stop moving away." ]	[ "A) Endeavor is being moved to Los Angeles to be put on display in a museum. B) The space shuttles are pretty much flying bricks. They're meant to fall out of the sky allowing some degree of control. Their wings cannot provide the needed lift, and the engines aren't designed for forward movement through the atmosph...
How does a motor output a torque at a constant rate of rotation?	[ "There are loss mechanisms due to friction and so on in any real system. Therefore, to rotate anything at a nonzero constant angular speed a finite torque is required. This is fancy physics mumbo jumbo that translates to, \"you need energy to keep something spinning when there is friction.\" For a given load on the...	[ "Because it is not 100% passive. In order to detect the radar, the signal being received by the antenna is mixed with a signal from inside the radar detector called a \"local oscillator\". The signal from the LO can be received for a short distance outside the car. & #x200B; For a bit more information, google \"Su...
When I'm several stories up and I look at the ground why do I feel like is want to jump knowing it would kill me?	[ "There is a theory that L’appel du vide (call of the void) is a result of our base brain still recalling a time when we lived in trees and, like monkeys, would jump out into open space without hesitation to get to another tree or escape an obnoxious proto-human who was hassling us. That may actually be partially th...	[ "The chemical imbalance theory of depresssion is questionable. For example, most antidepressants on the market are a serotonin reuptake inhibitor. However, there is also an antidepressant that is a serotonin reuptake enhancer. And the fastest acting antidepressant in the world, ketamine, doesn't act on serotonin a...
Does the president's foreign policy affect the price of gas?	[ "Yes it will. Depending on how the President feels towards OPEC and other countries that have oil will affect how they feel about us. If the President goes pissing off all of these countries they could easily raise prices or stop giving us oil entirely such as in 1973 when we supported the Yom Kippur War and they e...	[ "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!" ]
What is actually happening when I have an itch?	[ "We aren't totally sure. There are a few different types of itches that are created by different nerve bundles for different reasons. An itch has many similarities to pain sensations and is somewhat overwritten by pain sensations. The two messages both use the same pathways and tracts to your brain, but are distinc...	[ "You are currently processing crystal clear images of your surroundings, focusing on this post, reading squiggles and translating them into sounds, connecting those sounds into words forming sentences with meaning while simultaneously feeling your hand on your mouse, smelling the air, hearing and interpreting sound...
Nabokov's quote "Solitude is the playfield of Satan"	[ "People are less afraid to be evil when they're alone. There's no judgements or voices to stop them. A murderers job is easier when there's only one victim. You can't stop what you don't see." ]	[ "Google's _AlphaZero_, trained solely by reinforcement learning from games of self-play, took 4 hours to beat the previous world champion chess program, Stockfish 8. [Paper](_URL_0_). (PDF)" ]
Why is Polaris visible all the year?	[ "Stand up and look straight up at the ceiling. Now rotate 180 degrees. You'll notice that a portion of the ceiling stays in your vision while you're turning. You can think of Polaris as being located near the straight up for Earth. The sky does change throughout the year. Sagittarius is a summer constellation in th...	[ "> I see pictures like this: _URL_0_ and long to see this sight for myself. I think those types of pictures are taken using decent cameras with high ISO settings and a long exposure time (maybe 25 seconds or more). They don't reflect what you'd see with the naked eye, unfortunately. Here's one photographer's rendit...
Why do we think more "deeply" at night?	[ "It's most likely because you're on your own without any loud distractions. Same thing happens to me when I'm in the shower. I'm a genius inventor and philanthropist in the shower." ]	[ "i read a similar question not long ago and somone else said basically its that most of our primitive predators wouldnt hunt during rain. so its kinda like you can kick back and relax that you wont get eaten. made sense to me." ]
What’s the difference between stock and broth?	[ "Stock is made from the bone, and broth is made from the meat. Stock also tends to be thicker." ]	[ "Ask Reddit is for personal opinions, stories, and the like. Essentially subjective answers to questions without hard answers. Something like \"whats your favorite food\" is a good post there ELI5 is for getting a simplified answer or explanation to a question that you don't understand. A good thread here would som...
How does a woman's immune system not attack their fetus when pregnant?	[ "The placenta functions as an immunological barrier between the mother and the fetus, creating an immunologically privileged site. _URL_0_" ]	[ "You said it... instinctively. As to how that came to be? Evolution. Animals which attacked weak points on their prey or predators were more successful, bred more, and they're the ancestors of the animals we know today. Evolution is an arms race, and having an advantage means your genes get to keep going." ]
How do YouTube mix music channels make money?	[ "Label force YouTube to add ads on videos with copyrighted content. Then, the user have the choice to keep the ads (all revenue go for the copyright, so you don't get any money) or to remove the video." ]	[ "You have automatic copyright on anything you create (text, image, audio, video...). Writing \"copyright 2013\" doesn't matter, it's just common practice and a bit of a way of saying \"I don't want you to copy this\"." ]
Why is the discredited Laffer curve still so prevalent in conservative economics?	[ "The premise of your question is wrong. The Laffer curve hasn't been discredited. You could argue that the maximum revenue point is higher than what the US and most European countries tax now or that there is a more nuanced approach to the concept, but the underlying idea is both simple and sound. The idea of the L...	[ "I don’t think there’s anything to explain. Sometimes we as humans are just hypocrites. Why is Bill Clinton given a pass on all the allegations against him? Why do people follow some bits of the bible and reject the bits they don’t like? Humans are strange." ]
Why sea waves can never be from land to sea?	[ "The wind has to rub against the water for some distance to make waves. So when the wind is heading from land to sea, it might create waves heading that way, but they won't appear until far offshore, where the wind has had some room to do its work. Meanwhile, waves created far away and headed toward you (on shore...	[ "Waving your arm is too slow to produce directly sounds of audible frequency. However when moving your arm fast enough you produce turbulence that then results in higher-frequency sound. This, on a theoretical standpoint, lies in the highly-nonlinear character of fluid mechanics. In a linear theory, like electromag...
Why do the pixels get distorted when you take a picture of a computer screen?	[ "the pixels in the screen are part of a grid. so are the pixels in the camera's sensor. it's very hard to get the two grids to align perfectly while taking a picure" ]	[ "A lot is also due to comparison. When one watches the news, they see footage from 10,000$ + studio cameras. These shoot full HD and are tripod mounted, so a shaky camera phone, which isn't the same quality as the studio will be noticed more." ]
what happens to posts that make the front page? Do they slowly drop down or just dissappear after a certain amount of time?	[ "When sorting posts by 'hot' time is taken into account when ranking them. To see the posts with the most upvotes independent of time sort by 'top'. To more directly answer your question they slowly drop down as the time factor in the equation of their rankings increases." ]	[ "This illustrates the difference between this subreddit and r/answers. This kind of requests doesn't belong here. r/explainlikeimfive serves the purpose of explaining hard things in easier ways. r/answers works for trivial and curious questions like this one." ]
Those beautiful nocturnal sky with millions of stars visible you can see in some amazing pic shot in some lonely place of the earth, is it an effect or is it the location?	[ "Yes, but not to the degree you see in pictures. In a very dark place, with no moon, you can faintly see the Milky Way. Thousands of stars are visible and it's still pretty spectacular. The pictures you see on the internet of vibrant night skies are made by taking many long exposures and combining them with softw...	[ "Various reasons, but generally it's atmospheric distortion due to temperature gradients. Think about opening your door in the winter and watching the air shimmer as the heat goes out, or looking over a hot car in the summer. Same effect, larger distances.:)" ]
Cupping - What is up with this weird sports therapy that is giving the Olympians hickies?	[ "It's basically pseudoscience. I used to be a national level competitive swimmer (competed against/swam in the same meets as most of the current Olympic swimmers) and have tried cupping. It's an old chinese medicine technique that has no concrete backing in actual science. It didn't \"work\" for me, mentally, but m...	[ "NIH provides good objective information about the current status of these topics and _URL_5_ has good information about their history. Here are those pages for the topics you asked about: Homeopathy: _URL_4_ _URL_0_ Acupuncture: _URL_1_ _URL_2_ Chiropractic: _URL_3_ http://www._URL_5_/medicine/divisio...
How is Canada able to have free healthcare, and countries like the US is not?	[ "Its actually pretty simple - Canadian's voted for universal health care and pay more in taxes to the government to support the universal health care program. In the US, health care was deemed the responsibility of the individual (prior to the ACA) so there wasn't a universal government program and taxes were lower...	[ "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." ]
When the Federal Reserve increases or decreases interest rates, what does that mean?	[ "they change the lending rate, the rate that the banks pay to borrow money overnight. this raises the cost of capital for companies, makes them less likely to borrow to fund their operations, they slow their roll a bit. Sounds bad, but it causes civilians to save their money and it reloads the govts \"gun\" for spu...	[ "You have a lemonade stand. You sell it for 50 cents a cup. One day you find out it's going to be very hot outside and people are going to want more lemonade. You figure you can get away with selling it for a little more since the demand is there. So you start charging 80 cents. You notice that the number of people...
How did Australians (semi) keep their british accents while the Americans didn't?	[ "It's the other way around. The most noticeable difference between (most) English/Australian and (most) American accents is that most American accents (Boston being the noticeable exception) pronounce all of their \"r\"s while most English accents drop the \"r\" if it's not at the start of a syllable, so \"car\" so...	[ "That characteristic voice comes from a unique organ called the [syrinx](_URL_1_. Instead of having vocal cords and a larynx like mammals, their voice comes from the place where their trachea bifurcates (diverges) into two primary bronchi. It's actually pretty cool. By vibrating membranes found in the syrinx they c...
Were there any "radical" solutions to the Great Depression proposed?	[ "It depends on whose perspective you're looking at a particular proposal from. Most people are pretty comfortable with the idea of, say, Social Security today, but there were plenty of people who thought that it was downright un-American then. The New Deal was bitterly opposed for different reasons by different peo...	[ "A woman named Frances Wright did something like what you are asking in 1824. In Memphis, TN she bought two thousand acres of land from Andrew Jackson and would buy slaves. On this land she set up a co-operative labor system where they could basically work off their price of purchase and then they would be set free...
Is it possible to turn orange from eating too many carrots?	[ "I'd argue it's more of a yellow than orange, but yes. _URL_0_" ]	[ "I think we develop a \"been there, done that\" mentality in ways. I can not watch cartoons now. No matter what the topic. The irony is I just can't pay attention to cartoons." ]
Why do cells have receptors for toxic chemicals like snake venom or other different types of poisonous substances?	[ "The answer is kind of circular. We don't have special receptors just for toxins and venoms; that's why they're toxic/venomous in the first place! Those receptors have a legitimate function for the cell under normal conditions, and by attaching to or acting enzymatically on them, toxins just stop them from workin...	[ "It is called co-evolution: The plant changes (evolves) a certain trait (like having sweet juice next to its pollen) by random chance, some insect loves sweet juice and transmits the pollen while collecting it. That triggers the plants that produce juice to have an advantage as well as the insects that show a tende...
Are light-bulb companies screwing us over?	[ "Keep in mind that the bulb in question is only drawing 4 watts and isn't being turned on and off constantly so there isn't the thermal expansion/contraction cycles that a typical light bulb goes through. _URL_0_" ]	[ "Because is costs them money to bring that signal to you. Why does a gas station charge you 99 cents for a bottle of water when it falls out of the sky for free?" ]
Can a computer virus/trojan/whatever destroy a computer beyond repair?	[ "yes. It is very possible, but a lot harder than the ones that just corrupt the software. Computers work by moving electrons around. The software controls that. You can corrupt the software to the point that it shuffles electrons wrong and destroys a computer. Many computer components are monitored by a software, l...	[ "The way I understand it, it gets \"marked\" to be overwritten. Meaning when new data is put onto your hard drive, it goes into space on the drive waiting to be written to. This space could be empty or have data on it that is \"marked\". There are programs that will overwrite this free space numerous times to ensur...
When astronauts are in space and they use trusters what are they trusting against to move forward?	[ "Thrusters don't work by thrusting \"against\" anything. They work based on the conservation of momentum. When you throw something in one direction, what remains has to move in the opposite direction for the momentum of the entire system to remain the same. Imagine standing on a skating rink wearing ice skates and ...	[ "A few different ways; - [Lasers](_URL_0_) for really close things like the moon. - [Parallax](_URL_2_) used for nearby planets and stars. - [Standard candles](_URL_1_), the brightness of a specific type of supernova which gives a good range. - [Red Shift](_URL_3_) for things very far away. For more detail on how a...
If rods are most sensitive to wavelengths of light around ~500 nm (green-blue), why do they give rise to a colour sensation that is on the greyscale?	[ "You need at least two kinds of photoreceptors and compare their relative activations in order to get color vision (this is the color-opponency part of the cone system). Here's the problem: a single photoreceptor has a range of sensitivity across the electromagnetic spectrum. It also responds / fires more as a func...	[ "Right now a polarizing system is used where each lens on the glasses is polarized in a way that corresponds with 1 of the two pictures being projected, causing it to be black in that eye, which leads to two different pictures in each eye. So, someone who is color blind would have no issues with the current system ...
If all historical and religious text from Wicca religion were destroyed how can people practice today?	[ "Wicca did not exist during the crusades. It was invented during the 20th century and is an amalgamation of (supposedly) pre-Christian pagan beliefs. One of Wicca's core beliefs is that witches were not satanic: they were practitioners of pre-Christian religions, so traditions were carried through time and persecut...	[ "Honest question asking for clarification and not just me being snarky: Do things like [Cahokia](_URL_1_) or the various mounds built by the [Hopewell](_URL_2_) not count? There are also many remaining structures in the [Southwestern United States](_URL_0_). If none of these count, could you please rephrase your qu...
The effects of time dilation on me vs. Earth if I am floating stationary in space	[ "> So, we are all on this rock going fast around the Sun -- does that mean that time is somewhat slowing down for us when compared to someone who is just floating in space? That depends what you mean by \"floating in space.\" There is no absolute reference frame that we can call the \"reference frame of empty space...	[ "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...
What happens to someone's body when they exercise regularly but also eat high amounts of junk food?	[ "You've got to be careful. Being overweight is correlated with a lot of negative health outcomes (Type 2 diabetes, high blood pressure, inflammation of the joints, inflammation of the arteries, the list goes on and on). But being overweight is not the cause of these problems. They are correlated because they have a...	[ "I'm sorry that I'm no expert, but I remember reading about this the last time a similar question was asked: _URL_0_ Basically, you percieve time faster after your run because of endorphines released during the work out, which means that the music seems slower. This is apparently also why a lot of rock musicians pl...
why do most cold liquids taste better than warm liquids?	[ "They don't. The temperature of food or drink affects how volatile certain chemicals in it are, and thus the relative intensity of the flavor of them. When something's cold, it takes a lot stronger of a flavor to be able to be tasted. If you're drinking beer that must be cold to taste okay, then it's bad tasting be...	[ "This doesn't change between babies and adults. It's actually the exact same. What changes is they way we take our drinks as we get older. As babies we are drinking from a nipple (either an actual nipple of a simulated one on baby bottles). A baby has to suck to get liquid out of it. If you tilt a baby bottle, ver...
How do mountain climbers keep themselves clean on large expeditions (ie: Mount Everest)	[ "They don't really. Some bring baby wipes or something" ]	[ "not discouraging any further contributions on this topic, but FYI, similar questions have been asked, so you 'll find some of the previous responses here: [Did everybody \"smell bad\" in the in the medieval period?](_URL_6_) [Is it safe to say that every single great person in history prior to, say, 1930, would, t...
How is art value decided.	[ "Supply and demand. The more people want a piece of art, the more expensive it will be. The less pieces of art like this there are, the more expensive it will be. Demand will vary along the factors DrRockter explained." ]	[ "I heard it had a lot to do with the invention / discovery of the camera obscura. This helped people understand perspective / proportions / etc better. Here's a quick article I found about it - but there are a ton of others, videos, books, etc that talk about it in more depth. _URL_0_" ]
How are you able to run an illegal business (I.E: a moonshine business) on reality TV and not get in trouble?	[ "There are a few reasons: A) It could be fake, as ET_phone_1900FatGirl pointed out. B) It is difficult to prove that the people in the show are performing an illegal activity. How can law enforcement know it's not fake? Could it be water, not moonshine, in the bottles? While the show could theoretically be used a...	[ "Discovery Channel, TLC, The History Channel, they started out as niche channels...inexpensive programming aimed at a specific audience it was easier to target ads for. Then came Mythbusters, a big hit that appealed to a broader audience. Soon all the networks wanted to try to reach a wider range of viewers, and ...
Why is it good to eat "bland" food when we're sick?	[ "Because often when you're sick your stomach is already inflamed or irritated or you may have nausea. So it's recommended to eat lighter food so that it's easier on your digestive system and you don't vomit." ]	[ "The point of camo, in general, is to break up the form of whatever is covered in camo. It's easy to spot a tank, artillery, or a soldier by their outline alone. Camo, by using strange shapes, and various shades of color, makes it hard to find the form underneath. \"Blending in\" is secondary to breaking up the for...
Apples iTunes user agreement.	[ "You can't use it in the production of nuclear or chemical weapons." ]	[ "Pepsi offered their product at a better price so they signed a contract. And if somebody asks for coke, they'll just say: oh we don't have, what about Pepsi? and nobody says NOOOOOOOOOOOO THERE'S SUCH A BIG DIFFERENCE AAAAAAAAAAAAAAAAAA THIS IS UNACCEPTABLE!" ]
Why is the "Croatoan" mystery so heavily talked about?	[ "It's a good ghost story, in the typical version - \"Settlement vanishes, the only clue is the mysterious word CROATOAN carved into a fencepost\". It's not much of a mystery to people who have done research on the area, though. The Roanoke colony was friendly with the local Indians, who had a settlement on the nea...	[ "Some of my uni professors in the dendrochronology lab (tree rings) at the U of Arkansas did research on this by studying the climate of the area all the way back to about 1100. The research revealed that the 3 year period surrounding the colony was the driest, most extreme period of drought in the 800 years studie...
Why doesn't the prices of items here in America not include taxes? Why isn't the initial lottery amount the amount after taxes have been taken out?	[ "It has to do with the specific tax policy desired. If the intention of the tax is not to decrease consumption of the good, then the tax is added at the register so it does not affect the perceived price of the good. (Think clothing, prepared food, etc). If the intention of the tax is to reduce consumption (think c...	[ "Online, pictures of cars are often pointing out what an awful job they did parking or driving or whatever. Also, reddit specifically asks that we don't post personal information. If we could see the plate for the guy that parked like a jack-ass at the local Goodwill, some other jack-ass might look up their informa...
Why do we become motivated at night but can't follow through with our decisions come morning?	[ "\"All men dream, but not equally. Those who dream by night in the dusty recesses of their minds, wake in the day to find that it was vanity: but the dreamers of the day are dangerous men, for they may act on their dreams with open eyes, to make them possible.\"" ]	[ "Has to do with your circadian rhythm: _URL_0_ Basically in a 24 hour period there are 2 times when your body is telling you to go to sleep and 2 times when it is telling you to be most awake. If you sleep late, when you wake up you might be closer to the time at which your body is telling you to sleep. _URL_1_dr-...
If all of Earth's water was delivered by a single comet, how big would it have been?	[ "[In graphical form](_URL_0_) [In good old wolfram alpha](_URL_1_) Long story short, about 1350km across." ]	[ "Such hypothetical / speculative / open-ended questions are better suited for our new-ish sister sub /r/asksciencediscussion. Please consider reposting there instead." ]
What’s the Best Design for a Flying Mars Robot: Why not send a (semi) autonomous zeppelin?	[ "The mean surface pressure is only 0.6% of that of Earth, so you'd need a very large balloon. VERY large. Then, you'd need to overcome any winds, which would require plenty of power, which means large power systems, and an even bigger balloon. Plus you'd need to fill it, meaning you'd have to deliver hydrogen or he...	[ "Cost, safety which is a component of cost, and the reception of the consumer to having to order and pay in some kind of interface when a large group of people can't even figure out credit card terminals at the grocery store. Additionally, wherever the food comes out you'd have to make sure it got I the right perso...
Are the biblical references to "the land of milk and honey" just a literary flourish or was milk and honey an actual luxury food item?	[ "Not discouraging other contributions, but fyi there was an interesting thread on this a while ago * [Why is the Promised Land of Judaism referred to as the land of milk and honey?](_URL_0_)" ]	[ "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...
Why can you see clouds from far away but not up close ?	[ "In what way? I was on a plane last week and saw a cloud right outside the window." ]	[ "Your eyes are constantly making adjustments for your movement, and your brain corrects for motion blur. A camera has to take a snapshot during a moment in time. If you move the camera during that moment, then the image is blurred. However, if your camera has a very fast shutter speed then the image will not be blu...
How can uranium be used for "peaceful" purposes (as Iran wants to do)?	[ "Uranium can be used to generate nuclear energy, which can be used as an alternative for fossil fuels to provide buildings with electricity." ]	[ "> I've seen in textbooks that the nucleus of an atom looks like several sphere compacted into a bigger sphere, or whatever. That's not really a rigorous depiction, but yes, we understand a lot about the structure of nuclei. > My thoughts are that this would have minute effects on how the nucleus affects the atom ...
Why is it so difficult to breathe with your head out the window of a moving car?	[ "You breathe by having your Diaphragm expand your lungs, which creates an area of low pressure, causing the air to enter. You exhale in reverse. When sticking your head out the window, the air rushing by your mouth/nose is already at a lower pressure since it's moving. This means the pressure differential between t...	[ "Our eyes are for the most part made of water. Specific heat, which is a measure of how much energy it takes to warm a substance up, is really really high for water compared to a lot of other substances including air. *That means a lot of energy needs to be transferred from our eyes to the surrounding air to make o...
How does a nose produce a seemingly infinite amount or snot?	[ "The same way they produce a seemingly infinite amount of red blood cells, or skin cells, or hairs. You eat and drink. Your body processes this material to replenish itself. This replenishment includes making snot, skin, blood cells, and so on. You can blow the snot out of your nose, but your nose is making more as...	[ "You [naturally use only one nostril at a time](_URL_0_), so that's where congestion builds up and where you notice it." ]
When you're flying in an airplane, why does it look like the cars or waves are staying still and not moving?	[ "they are moving very slow compared to you. And you are seeing a very large image. You might be seeing an area 50 miles long. Its takes a car a very long time to travel 50 miles. If you fly at night you can easily see headlights from very high altitudes. If you look close enough you will be able to distinguish betw...	[ "From a distance you're only viewing the largest features of the smoke cloud. Up close, you're viewing much smaller, faster moving features of that cloud. Due to the fractal nature of such an object these features are different sized but similar looking. Next time approach the cloud but be mindful to focus only on ...
What was the history of Western Europe before the invasion of the Rome Empire.	[ "With the exception of the Etruscans, none of the pre-Roman cultures in western Europe left written records. There might be limited inscriptions from the Greek colony of Massala (modern day Marselles) or the Carthaginian colonies on the east coast of Spain. Archaeological evidence indicates there were hundreds of f...	[ "depends on your measuring stick. people did what was best for them given the amount of natural resources, environment, etc around them. for example, maybe europeans had guns, but tomatoes originated in central america. where would you be without tomatoes? guns have little to no effect on your life, but i bet youv...
How do we get vitamin(s) from the Sun?	[ "The energy from the sun is used as part of the process that your body uses to create vitamin D2 and D3 precursors. The sunlight itself is not converted into matter, it's used an an energy source for the reaction." ]	[ "It's already done. The first ones were built decades ago. They actually focus the light onto a tower that has a molten salt running through it, which carries and stores heat more effectively than water. It's then used to heat water, to make steam, to run a turbine. Because the salt stores heat so well, electricity...
Why isn't water constantly forming?	[ "Back when I was at MIT (in nineteen mumble mumble), we made something we called a Hydrogen Bomb. It was actually a balloon with two parts hydrogen and one part oxygen (made in a chem lab). In the evening they were suspended from an outside balcony so they almost reached the level of the roof, but suspended from th...	[ "Scientists are looking for the holy grail of cold fusion. That is fusion that is accomplished without putting in the vast amounts of energy you refer to with multiple laser beams. Even without finding 'cold' fusion, we may be able to start a fusion process going with many laser beams, and then use part of the ener...
Why do organizations like One Million Moms still exist even though what they're protesting is almost always a joke for everyone else?	[ "AFA has 180K members and pull in about $20M/yr. You might not agree with them, but that doesn't mean they don't have a right to do their thing." ]	[ "Imagine a flamethrower and a crowd of X-Men kids. there's a range of powers. Burn the crowd for 20 seconds and they all die. Burn them for 10 seconds, and maybe that thick skinned or overly hydrated kid survives. He wouldn't have survived the assault for 20 seconds, they would all have died. But now he survived. X...
What happens to the speed of photons emitted by a moving light source? Do they travel faster than the speed of light, c?	[ "No, they still travel at c, but the [frequency](_URL_1_) and [direction](_URL_0_) of the light waves will in general be different than if the source was stationary." ]	[ "They use extremely fast camera shutters to capture a very short moment so you can see the light beam. However they can not reset the camera in time for the next frame so they cheat a bit by sending a new beam of light for the next frame. They make sure to synchronize the short beams of light with the camera shutte...
why and when did we start calling policemen cops?	[ "There are a few theories I have heard. 1. In the 1840's police officers wore copper buttons on their jackets - and they were originally referred to as \"Coppers\". 2. The term cop, as a noun, is derived from the verb, to cop, which means to take or seize. The story of cop being an acronym for \"Constable On Patrol...	[ "hi everyone! just a reminder to respondents to be mindful of this sub's [\"20-year rule\": no discussion of events/conditions post-1994 please](_URL_0_)! thanks! OP, if you'd like to carry on this discussion for more recent years, consider x-posting this question to /r/AskSocialScience." ]
At which period in time did leaders stop leading their armies into battle?	[ "This is actually in the [Popular Questions](_URL_0_) section of the wiki. I hope you find what you're looking for." ]	[ "Sorry, we don't allow [\"trivia seeking\" questions](_URL_0_). These tend to produce threads which are collections of disjointed, partial responses, and not the in-depth discussions about a particular topic we're looking for. If you have a specific question about an historical event, period, or person, please feel...
How does the whole bail bond system work in the courts over in America?	[ "You are arrested for a crime, and either your bail is set by statute (common for minor crimes) or you wait for your arraignment where the court sets your bail. Once you know your bail amount you have two choices: 1. Pay your bail. You give them the money, and you get it back when you show up for court. 2. Pay a ba...	[ "Because there are no laws that govern the entirety of the internet. There are laws in countries that limit what the people living inside of its borders can do with the internet, but those laws dont apply if you arent in that country. All pirate bay has to do to stay operational is to find a country that doesn't ca...
Why do I hear a short crackle noise every so often when I have my headphones plugged into my laptop?	[ "This always happens when you move the contacts in audio plugs. Your headphones take electric signals from your laptop (and other electronic devices) and turn them into sound. When plugging them in, or moving the plug, you're interrupting said signals, resulting in irregular crackling noises." ]	[ "You could have [tinnitus](_URL_0_). You should see a doctor if you want any further information, since asking for medical advice is not allowed in this forum." ]
I had always heard that Ronald Reagan backed Osama Bin Laden when he was rising up in the Middle East by providing him arms to fight the Russians. Is this remotely true and if so what is whole story of our involvement in the Middle East during this time?	[ "You might want to check out the answers to these two questions: [I've heard many times that during the 1979 Soviet invasion of Afghanistan, the US armed, trained, and funded a new rebel group called Al Queada, recently founded by Osama bin Laden to help fight against the Soviets. What parts, if any, of this claim ...	[ "Karachi (largest city in Pakistan) is currently experiencing some large problems; both in crime, and politically. This is in part due to [Altaf Hussain](_URL_0_) who is the founder and leader of the [Muttahida Quami Movement](_URL_1_) - a political party in pakistan based in the city of Karachi. The problems surro...
Off the grid illegal	[ "There is nothing illegal about living \"off the grid\" and no one can be evicted from their home because of it. People can be evicted for not paying their rent or taking proper care of the house/apartment they are renting. People can be evicted for not paying property tax on the house they own. People cannot be ki...	[ "Write all plans, print it out and mail it to yourself, never opening it. It's a poor man's copyright. Other than that, I don't know. Hopefully someone else has more in-depth knowledge." ]
Why do cockroaches always seem to be dead on their back?	[ "With its legs folded like that (which happens naturally upon death), the insect is less stable and more likely to be rolled over. At that point, it is more stable, and it will stay that way." ]	[ "They only go home. They're one-way message carriers. You take one from where it's living and bring it elsewhere, then tie a message to it and free it, and it'll go back home. They can't be used to send a message to some arbitrary location." ]
If cell towers need lots of power to send data, how does my phone have enough power to send back?	[ "A few things here. First, the \"signal strength\" bar on your phone is entirely the receiving signal from the tower to your phone. Second, sending data from your phone to the cell tower is one of the most power intensive things that your phone does. Simply being closer to the tower and being able to use a lower tr...	[ "> I think it's just a delay in the OS's process to update the display And you are almost correct. It's not the display (which can be updated immediately), it's the OS that takes a little time trying to reconnect to the network before deciding it is really down. Your roommate doesn't know what he/she is talking abo...
Why, unlike other nineteenth century accessories like stocks and monocles, are neckties not yet obsolete when they have no particular purpose?	[ "They have always been decoration / fashion items not functional items. Monocles are replaced by glasses, contacts and laser eye correction as vision aides. You don't need to keep your pants up with suspenders any more since elastic waistbands and belts generally replace them. you don't need to keep your socks up w...	[ "Ease of use. Becoming proficient with a bow could take years and requires a certain amount of strength. You could teach someone to use a musket in a fraction of the time." ]
What really happened at Mt. Sinai?	[ "The Exodus story is mythical. The central debates concerning the historicity of the Old Testament centre around the united monarchy with David and Solomon. Everything prior is widely acknowledged to be mythical in nature. I personally think that the Exodus story is a product of atonement mythology and functioned i...	[ "> how it really amounts to a bunch of bologna I don't have an answer, but I do need to point out that bologna = lunch meat. Baloney = nonsense." ]
Can blind people wearing headphones experience a virtual reality effect in the same way that a seeing person wearing an Oculus Rift would? Is virtual reality possible for the blind at all?	[ "I would suspect something like binaural recording would come into play. You can listen to the results here: _URL_0_" ]	[ "If she can lip read, she will be conceptually familiar with spoken English because certain sounds correspond to certain lip movements. I've never received any instruction in Latin, but I can read a good deal of it from my knowledge of English and French, which derive from it. It's comparatively much easier to map ...
What exactly is going on when a limb falls asleep?	[ "If you put enough pressure on the nerves that tells your brain what they're doing or what they should do they stop working. It's sometimes called a \"pinched nerve\" which isn't a real medical term but still describes what is happening. From [National Institute of Neurological Disorders and Stroke](_URL_0_) > The...	[ "They mapped her brain activity and used the information writing the program that controlled the arm. The Doctors told her to think about moving her arm at the shoulder in all different directions, this caused brain activity in certain, specific areas; the Docs record this information and applied it to the program....
How do hotel door knobs synchronize with the hotel reception's PC?	[ "For the ones I'm familiar with, the door locks don't have any external communication with anything. Instead, the algorithm that generates the codes programmed into the key cards is predictable. So as long as the lock knows the \"current\" code assigned to it, it can predict the \"next\" code that will be assigned ...	[ "Hi there, while I don't claim to be an expert, I have studied the GDR extensively and I have not come across this anecdote before. It seems unlikely to me, for the following reasons: * Any goods imported into the GDR would have most likely been manufactured within the Communist Bloc, and therefore of questionable...
How was India perceived by ancient Romans? Is there any evidence of trade?	[ "What's the name of the town on the coast of India where St. Thomas supposedly landed? It was a Roman trade center for a number of centuries -- by way of Syria and the Arabian Sea, I think." ]	[ "The US at the start of WW2 was the largest oil producers at 1940. In this graph [here](_URL_0_) the US produces 182 million of metric tons of oil each year. It was out producing almost every other top oil producing countries on the list combined. The US didn’t really rely on Dutch East Indies too much aside from ...
why snow builds up on grass before hard surfaces like concrete?	[ "SInce grass has air flow between the blades is cools down faster than a flat ground surface like concrete so its actualy colder than the concrete by a few degrees allowing the snow to not melt as fast. After a time the concrete will cool down from the snow and eventualy either create a layer of ice or, if its a la...	[ "_URL_0_ Reportedly cows tend to feed more around sundown when the nutritional content of plants is higher. > “A series of USDA studies looked at animals’ ability to choose different forages. The researchers cut hay in the morning and in the evening and used this in the choice tests. They’ve done it with cattle, g...
Why we need both a Senate and a House of Representatives?	[ "The House is elected every 2 years. So, they are closest to the people and will be most reactive to changing opinions. But, Senators are only elected every 6 years. So, they have the luxury of being able to make unpopular decisions that might still be the best thing for the country. They temper the raw populism of...	[ "This CGP Grey video does a really good job of explaining it all. _URL_3_" ]
How does fast reading work and is it really efficient enough as that of an average person?	[ "I've heard people say that you should skip sentences or only read the top and bottoms of paragraphs and shit, which is really stupid. Reading quickly shouldn't be a substitute for understanding what you read. If you read a lot you'll get faster at it obviously, but if you're not reading half of the text then you'l...	[ "Think of it as evolutionary to survival. If you aren't doing anything, those are the things you should catch up on so if you do have to fight for your life, your ready to go." ]
I once heard that a normal laser pointer can pop black balloons?	[ "You need a more powerful laser than a standard laser pointer provides. Most laser pointers are class ii devices (which means that they use under 1 milliwatt of power). Class iii-b devices are between 5mW and 500mW (half a watt) of power. On the higher end of that range, the beam can lightly burn skin, and comprise...	[ "Because the secondary charge is packed in the shape of a star or a smiley and a small charge ignites and inflates the shape before the secondary charge blows up. _URL_0_" ]
What happened to the Imperial Cities following the disbandment of the Holy Roman Empire?	[ "By the time of the disbandment, there were only six Free Imperial Cities left: Augsburg, Bremen, Frankfurt, Hamburg, Lubeck, Nuremberg. The rest were \"Mediated\", meaning absorbed into the surrounding respective territories, in the Mediation of 1806. This had to be done in response to Napoleon I's re-ordering of...	[ "A) Endeavor is being moved to Los Angeles to be put on display in a museum. B) The space shuttles are pretty much flying bricks. They're meant to fall out of the sky allowing some degree of control. Their wings cannot provide the needed lift, and the engines aren't designed for forward movement through the atmosph...
how is a serving size determined?	[ "It's all made up. At least in the US, there's no standard. All they're required to do is show the amount of servings in the product and what each serving represents. i.e. the company arbitrarily decides how many grams/ounces/any random measurement equals 1 serving." ]	[ "Pretty sure its regulated by the ATF. The FDA does not regulate it. The FDA has nutritional info as a requirement, the ATF doesn't." ]
How would you power a single light bulb with a bicycle?	[ "with dynamo. I remember back when I was a child, my uncle had a bicycle which have dynamo cylinder near rear wheel, it has extended neck which has roller, which is slightly connected to roll to bikes wheel, so whenever he flicksa switch and pedals the bicycle the bulb will light. as for the construction of dynamo ...	[ "Technically speaking this wouldn't be too difficult, we have the technology to do it today. The problem is that despite looking awesome, there isn't that much energy in lightning. You can see the calculations [here](_URL_0_). For comparison, that's the equivalent of about 1 gallon of fuel." ]
Why, in popular media, are black holes depicted as flat? Wouldn't they be spherical like a planet?	[ "They are spherical, and they are generally depicted as such. It's just that when you portray a spherical object in a 2D image, it looks like a circle. What can be flat is the accretion disk, the gas and plasma that's orbiting and falling into the black hole. It forms a disk because any gas not orbiting in the disk...	[ "Every object's gravity is stronger the closer you are to it. Until you get close to its event horizon, a BH's gravity is almost the same as that of ay other object with the same mass." ]
Why did europe seem to industrialize earlier than other parts of the world that had previously been more dominant in the fields of science and inventing?	[ "There is a school of thought that argues that industrialization was really just a manifestation of capitalism. Adam Smith wrote the Wealth of Nations in 1776 in England. So, it's not necessarily that Europeans were more crafty or better at technological innovation, rather they were just best at mass producing thos...	[ "It's all about absorbing sunlight. Skin color is due to the amount of [melanin](_URL_1_) in the skin. You can see [in this map](_URL_2_) that darker skin colors are found nearest to the equator. As our ancestors moved in to areas ~~with more cloud cover (rainy England, for example)~~ where sunlight is less concent...
What's happening in Libya? How has the US responded?	[ "Riot in Benghazi, Libya at the US embassy over a shitty anti-Islam movie that insults Muhammad. During riot, RPG strikes embassy, killing four. Ten Libyans also die, possibly while defending the embassy. May have been an organized attack by a group similar to al-Qaeda. US responds with harsh words and deploys a Ma...	[ "[Search before submitting, especially when asking about current events. The search box is in the upper righthand corner of the page.](_URL_0_)" ]
Mathematicians and physicists, how do you understand complex equations?	[ "Units are your friend, at least in physics. In the equation you gave, KE=1/2mv2, KE has units of joules. You should have also learned that a J is equal to kg*m2. And that is how you know the m is squared. When I was taking physics, I only memorized units and the basic parts of equations, then just filled in the re...	[ "You can learn it quite easily by following some of the tutorials on YouTube - I learned to do it without references in a couple of hours. It takes NO skill to just solve it - doing it really fast though, is something else." ]
When you accidentally spit small droplets on your monitor, why are they rainbow colored?	[ "They act as small lenses [magnifying](_URL_1_) the part of the LCD panel immediately below it. And LCDs panels are built up of [tiny red, green, and blue elements](_URL_0_) so you get to see an enlarged view of these pixels through the droplet." ]	[ "As you add neutrons the nucleus becomes less and less stable. At some point it will go from simply being unstable to not being a bound state at all, and any further neutrons added to the system will simply 'drip out'. This point is known as the 'neutron drip line'. The proton drip line is the same thing, but for v...
Do droughts have a specific cause that prevents rainfall for an extended period of time or are they a statistical anomaly of rainfall not occurring for an extended period of time?	[ "A little bit of both, but most of it probably has to do with the geography of the area. Places far from bodies of water or behind mountains are less likely to get rain in the first place, and the randomness of cloud movement and wind patterns can sometimes prolong the periods between rains. Put those two together ...	[ "In the case with only one person sucking, they will still receive water, but only if they suck hard enough. The airflow across the T connection will generate vacuum pressure, sucking the water up the straw and, if there is sufficient vacuum pressure, into the T, aerosolizing the water. This is how many commercial ...
Are there any celestial bodies that are not satellites?	[ "The moon doesn't really orbit the earth. Both the earth and the moon both orbit a point between the two, called the barycenter. Same with the sun and the earth. This is the case with all objects that interact via gravity, every object in the system is going to be influenced by the gravity of every other object in ...	[ "Since the question has already been answered, I'm just going to throw in a plug for my favourite app for answering these kinds of questions, [Google Sky Map](_URL_0_). Just point it at whatever is confusing you, and it tells you what and where everything is." ]
How close can matter and antimatter get before they annihilate each other?	[ "Very similar question from two weeks ago: _URL_2_" ]	[ "Generally speaking we can't talk definitively about what we can't yet observe so people usually mean when _we see it_. For example [eta carinae\|_URL_0_] is expected to go nova in a relatively short time, anywhere between today and the next million years or so. However since it is 7500-8000 light years away it coul...
Were there famous gunslingers/cowboy equivalents in Russian history/folklore?	[ "/u/poob1x compares [the Russian Far East to the American West](_URL_0_)." ]	[ "Sorry, we don't allow [\"trivia seeking\" questions](_URL_0_). These tend to produce threads which are collections of disjointed, partial responses, and not the in-depth discussions about a particular topic we're looking for. If you have a specific question about an historical event, period, or person, please feel...

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