question stringlengths 3 301 | answer stringlengths 9 26.1k | context list |
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For a typical box fan, does the air move because the blades "push" it or because of the Bernoulli Effect? | Fan blades work the same way screws work. As the blade turns about it's axis, the pitch of the blades forces air to move in the direction of the fan's axis (as well as spinning with the fan, but that's irrelevant here).
Bernoilli's principle is just a way of expressing conservation of energy in a flow of fluid, so it ... | [
"The air flows through the channel in the pedestal of the fan when the motor is turned on. After that, the air flows through the hollow tube. Then the air is shot out through 16-mm slits. This air flows smoothly, rather than turbulently as with a traditional fan (fan with blades). The curvature of the inner wall of... |
why does depression increase a lot when you happen to fall in love ? | From personal experience, depression seems to happen because the brain is focused on itself and it’s perception of itself from an outside perspective. Falling in love with someone is heavily emotional and depends largely on how the person you are in love with treats you. A depressed brain heavily relies on positive val... | [
"Depression can lead to a high increase of unemployment. It is more likely a balance sheet recession can cause depression. \"Due to falling asset prices and bank losses, this has a large impact on economic activity\".\n",
"In addition to the loss of a relationship with a loved one, conflict has also been suggeste... |
why is lemmy such a big deal? | First off, I hate Motorhead.
However, most metal fans and musicians loved the band. They had a unique sound forged in the early days of metal. Lemmy was the front man and only consistent member of the band. He was an icon.
Oh, and [Lemmy was God.](_URL_0_) | [
"Lemmy wanted the music to be \"fast and vicious, just like the MC5\". His stated aim was to \"concentrate on very basic music: loud, fast, city, raucous, arrogant, paranoid, speedfreak rock n roll ... it will be so loud that if we move in next door to you, your lawn will die\". He recruited guitarist Larry Wallis ... |
what effects do electronic devices, wi-fi, electromagnetic fields, etc. really have on human health? | To date, there is no proof that there is any effect whatsoever. Doesn't mean that it's impossible, though. | [
"Most studies have been unable to demonstrate any link to health effects, or have been inconclusive. Electromagnetic fields may have an effect on protein expression in laboratory settings but have not yet been demonstrated to have clinically significant effects in real-world settings. The World Health Organization ... |
the fda and its role in tobacco regulation | I'm not knowledgeable on this subject, but I think the ATF (Alcohol, Tobacco, Firearms) regulates tobacco, not the FDA. | [
"The FDA's authority to regulate came from the Food, Drug, and Cosmetic Act (FDCA). The FDA argued that nicotine was a \"drug\" and cigarettes and smokeless tobacco are \"devices\" that deliver nicotine to the body within the meaning of the FDCA. Congress had enacted a number of tobacco-specific laws after the FDCA... |
how can manure/hay self combust in hot temperatures even though they're nowhere near 200+ degrees celsius? | hay is more than just dried grass... it’s actually undergone a natural curing process which locks in nutrients and makes it keep better. This happens because grass doesn’t die the moment it’s been mowed...its cells (and certain microbes on it) continue to respire, and this creates some heat.
now imagine this grass is... | [
"Hay baled before it is fully dry can produce enough heat to start a fire. Haystacks produce internal heat due to bacterial fermentation. If hay is stacked with wet grass, the heat produced can be sufficient to ignite the hay causing a fire. Farmers have to be careful about moisture levels to avoid spontaneous comb... |
i have acid reflux. what is happening inside of my body that makes it feel like i am softly belching molten lava? | You are burping up a strong stomach acid and while your stomach has a protective lining, your throath has not.
The acid is corroding your throath and that feels like belching molten lava. | [
"During an episode of acid reflux, small amounts of stomach acid may manage to escape from the stomach and into the oesophagus. Typically, gravity minimises this upward leakage but combining an inversion table and acid reflux can be a painful, nauseating, and potentially dangerous combination.\n",
"This stage is ... |
Physiology Blood type question, how can universal recipient receive any type of blood and universal donor can donate to any blood type without the transfused blood cells being attacked and destroyed? | Blood type describes the type of antigens (structures used in immune system response) found on a person’s red blood cells. The letters (A, B, & O) refer to sugar-based antigens. There are A antigens and B antigens. We use type O to refer to blood cells with neither A or B antigens. The plus/minus (Rh D) refers to a p... | [
"The donor's blood type must be determined if the blood will be used for transfusions. The collecting agency usually identifies whether the blood is type A, B, AB, or O and the donor's Rh (D) type and will screen for antibodies to less common antigens. More testing, including a crossmatch, is usually done before a ... |
What would happen if a soldier in the U.S. military from the south, was stationed in the north during the start of the civil war, but he support the confederacy and wanted to go fight for them? Would he be arrested or allowed to leave? | Fun fact, only officers really defected to the Confederacy. I am aware of no rank and file soldier defecting after secession, and even if one or two did, there was no mass exodus out of the Regular Army.
Thats important, because Officers were held to a different standard. Firstly, many of the men who became prominent ... | [
"Hylan Benton Lyon (February 22, 1836 – April 25, 1907) was a career officer in the United States Army until the start of the American Civil War, when he resigned rather than fight against the South. As a Confederate brigadier general, he led a daring cavalry raid into Kentucky in December 1864, in which his troops... |
what is the difference between a president, a chancellor, and a prime minister? | It varies from nation to nation. In general, many nations have both a head of government and a head of state.
In the Westminster system (UK, Canada, Australia), the Prime Minister is the head of the government and is in charge of all executive policy. The prime minister and other government ministers are also often, b... | [
"The Chancellor is the head of government and the most influential figure in German day-to-day politics, as well as the head of the Federal Cabinet, consisting of ministers appointed by the Federal President on the Chancellor's suggestion. While every minister governs his or her department autonomously, the Chancel... |
why are there so many fake movie trailers trending on youtube? | Majority of them are getting tricked, it's like people watching those GTA 6 videos. The people posting them do it on purpose for views, this one guy had practically made a living by making videos like "Rockstar accidentally sent me GTA 6!" If you throw some ads on you can make some pretty easy money | [
"Over the years, there have been many instances where trailers give misleading representations of their films. They may give the impression that a celebrity who only has a minor part in the film is one of the main cast members, or advertising a film as being more action-packed than it is. These tricks are usually d... |
What was life like in Rome's provinces? How different would life be in a province compared to Rome itself? | This is a very, very vast and complicated question. Not only does the meaning of what a province actually *is* change considerably over the course of Roman history, but the provinces themselves have an internal history and considerable variation, from Britannia to Egypt or Baetica to Syria. There can be more variation ... | [
"Each Roman province comprised a number of communities of different status. Alongside Roman colonies or \"municipia\", whose residents held the Roman citizenship or Latin citizenship, a province was largely formed by self-governing communities of natives (\"peregrini\"), which were distinguished according to the le... |
why does gravity influence objects with larger mass, even though they're farther away, more than those with smaller mass | The thing with space station is not that they're so far away or anything. If you build a tower as high as to reach ISS, you would experience about 90% of normal surface gravity on top of that building. You would not float, things would fall down almost as fast as on Earth.
The difference is that on ISS, people are on ... | [
"The distinction between mass and weight is unimportant for many practical purposes because the strength of gravity does not vary too much on the surface of the Earth. In a uniform gravitational field, the gravitational force exerted on an object (its weight) is directly proportional to its mass. For example, objec... |
what are the differences between the electricity in the usa vs. europe. | Europe uses a 220 volt system, whereas the United States uses a 110 volt system. The 220 volt system is just more powerful, but can also be more dangerous if you are shocked by it. | [
"As a whole, the European Union currently generates 11% of its electricity using cogeneration, saving Europe an estimated 35 Mtoe per annum. However, there are large differences between the member states, with energy savings ranging from 2% to 60%. Europe has the three countries with the world's most intensive coge... |
how are new data points created in a video such that a video filmed in 30 fps can be viewed at 60 fps? | Interpolation is a process where a display unit (TV/Monitor) takes two frames and puts them together (similar to an "average") to generate an extra frame in the middle. By inserting an extra frame between each one that was recorded, you effectively double the frames per second and can bring 30 to 60. | [
"Some teams use digital video cameras to record the pass, and then review frame-by-frame to develop an estimate of distance, but the traditional frame rate of 30 frames per second (FPS) can present a problem in that it is unlikely to capture a frame of the exact moment the returning dog breaches the plane of the st... |
If a Tsunami is coming inland would it be better to attempt to go upward into skyscraper, or try to go inland? | That depends on your location on the beach, the structural integrity of the beach-side buildings and the size of the tsunami.
Most tsunami travel a fairly short distance once beached, think of how quickly a big wave stops when walking on sand. The flooding can reach 300 meters or more from the coastline, the average ... | [
"Tsunamis, potentially enormous waves often caused by earthquakes, have great erosional and sediment-reworking potential. They may strip beaches of sand that may have taken years to accumulate and may destroy trees and other coastal vegetation. Tsunamis are also capable of flooding hundreds of meters inland past th... |
richard the lionheart. how did brits know what lions were if at that point they had never been to africa? | > If Brits didn't go to Africa until like the 17/1800s, why did they call Richard the first Richard the lionheart?
Here's your problem - this is untrue. It's true that there was less travel back then... but there was travel. Don't forget the Crusades were on during this time... which I believe is where Richard ea... | [
"British Lions were a short-lived British rock band, together from 1977 to 1980, with former members of Mott and Medicine Head. They released just two studio albums with little commercial success in the UK.\n",
"The British Lions toured South Africa a number of times. Despite officially being South African tours,... |
Historic Document Translation? | You are correct, it means 'ditto'
It shows up very commonly in passenger and freight manifests for ships. Other things said would be 'same', 'above', 'SAA', a single or double quotation mark or a carrot.
Source: Pg 4, [Immigration Research Guide from _URL_0_](_URL_1_)
| [
"Translation history concerns the history of translators as a professional and social group, as well as the history of translations as indicators of the way cultures develop, interact, and may die. Some principles for translation history have been proposed by Lieven D'hulst and Pym. Major projects in translation hi... |
why do so many apps require sign-up these days? | They require this information so they or their partners can send you marketing information based on what you so on you phone, where you are, what time it is, etc. If you want to use these apps most of the time you don't have a choice. Some of the app owners may also sell on the information they gather from you. | [
"A new single sign-on implementation known as \"Sign in with Apple\" was implemented, allowing users to create accounts with third-party services with a minimal amount of information. Users have the option to generate a disposable email address for each site, improving privacy, anonymity, and further reduces the am... |
Why were there so many different names for the ancient greeks? Lacedemonians, hellenes, etc... | In the Classical period, there is only one name for the Greeks: *hoi Hellênes*, the people of Hellas.
There were, however, numerous ways to refer to the Greeks in earlier times. In the works of Homer, the most common name for the Greeks is *hoi Akhaioi*, the Achaeans; this may have been an archaising way to refer to t... | [
"In the classical period, the generic term for Greeks was \"Hellenes\", echoing the Hesiodic foundation story in which Hellen was the founder of the Greek race. However, in the \"Iliad\", \"Hellenes\" is restricted to those inhabitants of \"Hellas\", a region in Thessaly. There were therefore at least two different... |
Why don't Americans eat very much sheep? | Hi, not discouraging further contributions here, but you may be interested in some previous threads on sheep in the USA
* [If sheep were so numerous and popular in medieval times, why do we use so few sheep products now? What happened to the sheep?](_URL_0_), with a few follow-on comments here [Why do I not eat mutton... | [
"Since the 1960s, per capita consumption of lamb and mutton declined from nearly 5 pounds to just about 1 pound, due to competition from poultry, pork, beef, and other meats. Since the 1990s, U.S. sheep operations declined from around 105,000 to around 80,000 due to shrinking revenues and low rates of return. Accor... |
how was the chris hanson predator show not entrapment? | Entrapment involves inducing someone to commit a crime they otherwise would not be inclined to carry out. For example threatening someone to get them to buy drugs. However posing as a drug dealer and arresting those attempting to buy drugs is not entrapment, as people not inclined to illegally purchase drugs would not ... | [
"On 5 September 1997, the Court of Appeal gave Howard Hughes leave to appeal against his conviction for the abduction, rape and murder of Sophie Hook. Six months later he sparked further outrage by launching a £50,000 compensation claim against the Bryn Estyn children's home, where he claimed he was abused as a chi... |
why does reddit have such a bad reputation amongst non-redditors | a lot of the big things reddit gets known for (the events that blow up) paint reddit in a bad light. The most popular probably is the witch hunt on the wrong guy for the Boston bombings, which made reddit look extremely racist. The other is the nazi flag on the front page (which is still the 6th most upvoted thing of a... | [
"Reddit's users tend to be more privacy-conscious than on other websites, often using tools like AdBlock and proxies, and they dislike \"feeling manipulated by brands\" but respond well to \"content that begs for intelligent viewers and participants.\" Lauren Orsini writes in ReadWrite that \"Reddit's huge communit... |
what action could navient take if all borrowers stopped paying our student loans? | I am sure there would be instant penalties for late payment. The borrowers would eventually have to pay extra interest. The debts are legal. Their manner of operation was not fair. If all the borrowers stopped paying the worth of the company would increase due to expected increased future revenue.
The company is good ... | [
"Defaulting on student loans can also end in a lawsuit. The government and private lenders can sue in order to collect on loans. There is no time limit on suing to collect on federal student loans, and the borrower can be sued indefinitely. Private student loans, in most cases, are subject to statute of limitations... |
Hello. I would like to expand my knowledge about the general history of Europe | Hi! Glad you're taking an interest in history. SO, you like Europe but don't know where to start. I'll give you a good list to get started but we have to cover two things first: Historical Interpretation and Historiography.
History isn't an exact retelling of the past, instead, it is an argument about the past; this i... | [
"BULLET::::- The Reconstruction of Europe: A Sketch of the Diplomatic and Military History of Continental Europe, from the Rise to the Fall of the Second French Empire by Harold Murdock, John Fiske; Houghton, Mifflin and Company, 1889\n",
"BULLET::::- Robinson, James Harvey, and Charles Austin Beard. \"Readings i... |
how old is the notion of the political party? | Many of the answers that have been given focus on the machinery of the modern political party, but the question is about the *notion* of the political party, which is rather different. As with many of the central ideas of modern liberal-democratic politics, this concept can be traced, broadly speaking, to 17th and 18th... | [
"The First Party System is a model of American politics used in history and political science to periodize the political party system that existed in the United States between roughly 1792 and 1824. It featured two national parties competing for control of the presidency, Congress, and the states: the Federalist Pa... |
Why did the pikemen of the Hellenistic phalanxes carry shields, while the medieval European pikemen didn't? | I don't know a ton about ancient pikemen, but as for the Swiss:
The massive pikes they used required two hands to use effectively, but that still could have allowed the use of a small shield. The Swiss pike formation adopted very aggressive tactics - the goal was to use a combination of speed, surprise, and shock to o... | [
"Such deep pike columns could crush lesser infantry in close combat and were invulnerable to the effects of a cavalry charge, but they were vulnerable to firearms if they could be immobilized (as seen in the Battle of Marignano). The Swiss mercenaries did deploy bows, crossbows, handguns and artillery of their own,... |
Who is the current "Lineal Champion" of military history? | I don't think this is answerable (even if it didn't break the rules).
The greatest military minds in history are by definition generals who performed exceptionally well. They won wars after wars, beat all those around them, and by these feats are labelled as exceptional military leaders. In this sense they are conside... | [
"Among memorable field leaders of the army were Nathaniel Lyon (first Union general to be killed in battle during the war), William Rosecrans, George Henry Thomas and William Tecumseh Sherman. Others, of lesser competence, included Benjamin F. Butler.\n",
"By some historians he is considered the most effective ge... |
why does the federal reserve pay interest to banks? what is the impact of this? | It's the other way around: the banks pay interest to the Federal Reserve Bank on money they borrow from the FRB.
A higher rate on those loans makes it more expensive for banks to borrow money, which makes those banks charge more for loans (discouraging borrowers) or be more cautious about the loans they make. | [
"The United States Federal Reserve System lends money to eligible commercial institution called discount window, Purposely created in 1913 as a mean to operate the central bank in The United States. The interest on loans given out to commercial institutions are discount rate, which is a monetary policy tool used by... |
Why is Hitler's Muder of USSR Civilians never talked about? | [This thread](_URL_1_) from /u/commiespaceinvader discusses Generalplan Ost, which is the larger planned campaign of murder in the East, beyond simply the Holocaust. It doesn't specifically address "why is it never talked about" in the way you might be wondering, but I would caution you about *any* question which is pr... | [
"In the Soviet occupation zone, members of the SED reported to Stalin that looting and rape by Soviet soldiers could result in a negative reaction by the German population towards the Soviet Union and the future of socialism in East Germany. Stalin is said to have angrily reacted: \"I shall not tolerate anybody dra... |
Is the optic nerve stretchy or is there some slack to let your eye move? | The optic nerve in an adult has about 8mm of slack to allow the eye to move.
Nerves in general do not stretch very much, and the optic nerve in particular cannot stretch at all. That's because it is part of the central nervous system.
Because the nerve connects directly to the brain, it is covered in an extension o... | [
"The nerve enters the deep surface of the muscle and is not easily visualised and differentiated from other structures running with it, such as the blood vessels. Parting the muscle damages the nerve further by stretching or even rupturing its branches which run superiorly on its deep surface.\n",
"When a muscle ... |
Would inhabitants of the ISS be able to see with their bare eyes if a nuclear war started on earth? | oh yeah, no doubt they could see it and the fires burning after..
talking about things which explode brighter than the sun..
ISS is only 350 kilometers up or so.. not very far
| [
"Speaking at the plenary meeting of the Parliamentary Assembly of the Organization for Security and Co-operation in Europe on 8 July 2019, she stated that “On the board of the International Space Station, [she and other astronauts] had a chance to see with naked eyes how bombs and shells exploded in Donbass and Luh... |
How does your brain know how to assemble the signals from the individual cells in your retina into a spatial image? | It is both hard-wired and partly plastic.
The basic organization is hard-wired, particularly in the crossing of some neurons from the right eye to the left side of the brain and some neurons from the left eye to the right side of the brain (while some from the right eye stay on the same side of the brain, and the same... | [
"Eventually, the information these cells collect in the retina is sent to various parts of the visual cortex, including the posterior parietal cortex and area V5 through the dorsal stream, and the inferior temporal cortex and area V4 through the ventral stream.\n",
"When a visual stimulus is seen before a saccade... |
Did any countries in the Middle East play any roll in WWI or WWII? If so, what? | There were a number of allied invasions in the region during 1941, as Britain pre-emptively dealt with potential threats to their oil supplies and lines of communications. At the time, the British position in North Africa was looking somewhat dire, as German forces under Rommel started to advance into Egypt itself.
I... | [
"The premise of the game is a prophecy by Nostradamus that at the end of the 20th century there would be a major world war, beginning somewhere in the Middle East. The game was produced at a time of escalating violence in the Persian Gulf due to the Iran–Iraq War.\n",
"The Middle Eastern theatre of World War I sa... |
why is everyone blaming the current ad revenue problems on youtube on youtube itself? | It's a very complicated subject to be honest.
Youtube is responsible to where those ads will be put on. If an ad is put on a video promoting violence, then it's the responsibility of youtube. The advertisers had confidence in youtube that their ads won't be used on inappropriate video.
That said. There is a lot goin... | [
"Advertising is YouTube's central mechanism for gaining revenue. This issue has also been taken up in scientific analysis. Don Tapscott and Anthony D. Williams argue in their book \"Wikinomics\" that YouTube is an example for an economy that is based on mass collaboration and makes use of the Internet.\n",
"In Ma... |
how can a [computer] screen keep track of each and every pixel? how can it be this specific? | The idea, or perhaps model, is that every pixel on your screen can be identified with its own address. For pixels, addresses are usually in the form of coordinates. A bit (or a lot) as how points are identified in a mathematical graph.
It is customary to assign one of the four corners of your screen device the coordin... | [
"When a single column of 24 pixels is scanned across a line of text, all of the information is acquired. However, with the sense of touch, people are capable of perceiving two dimensional images. Bliss wondered if the reading rate would be higher if more than one column of 24 pixels were used, and if so, how many c... |
how do refrigerants like hfcs and hfos work? | The way they absorb heat to act as greenhouse gases (absorption of infrared radiation) and the way they absorb heat to act as refrigerants (phase change at convenient temperatures and pressures) are unrelated to each other. They don't correlate because there is no reason for them to correlate.
Many substances are goo... | [
"Vapor-compression refrigeration or vapor-compression refrigeration system (VCRS), in which the refrigerant undergoes phase changes, is one of the many refrigeration cycles and is the most widely used method for air-conditioning of buildings and automobiles. It is also used in domestic and commercial refrigerators,... |
what is the difference between weapons grade and non-weapons grade nuclear material? | Weapons grade fuels have high enrichment, power-grade fuels are low enrichment.
Enrichment is what % of the nuclear material is capable of a chain reaction on its own. Power reactor fuel is < 5% Uranium-235 or Plutonium-239. The other 95% is a filler material.
Weapons grade fuel is > 90% Uranium-235 or Plutonium-... | [
"Weapons-grade nuclear material is any fissionable nuclear material that is pure enough to make a nuclear weapon or has properties that make it particularly suitable for nuclear weapons use. Plutonium and uranium in grades normally used in nuclear weapons are the most common examples. (These nuclear materials have ... |
If all ship's radars operate on the same frequency (S & X band), why don't they interfere with one another? | They generally would. Though specific bands are rather large, antennas/radars can operate in narrow frequency ranges within a band, and the frequency space required to prevent interference between two bands can be, by design, very narrow (you could have a radar operating at 9.985 GHz and another at 9.920 GHz). The amou... | [
"Frequency agile radars can offer the same advantages. In the case of several aircraft operating in the same location, the radars can select frequencies that are not being used in order to avoid interference. This is not as simple as the case of a cell phone, however, because ideally the radars would change their o... |
how all the counting numbers can be interesting at once | Well, you've simply created a paradox for yourself. By defining 'the first boring' as 'interesting' you've created an unbreakable loop, where your two classifications refute one another.
If it's the first boring number, it's not interesting. But if that makes it interesting, it's not the first boring number. | [
"If the number of counts is not very large, it is more accurate to measure the time interval for a predetermined number of occurrences, rather than the number of occurrences within a specified time. The latter method introduces a random error into the count of between zero and one count, so on average half a count.... |
A couple of rudimentary physics questions my teachers never could really answer, for some reason or another, that I'd like to still know. [Big post warning] | 1) Light has no *rest* mass but has momentum based on it's frequency. Newton's laws don't describe it as it wasn't discovered yet. Newtonian laws only apply to Newtonian physics.
2) They would repel one another as a function of distance squared.
3) Falling into a black hole is not destruction but compaction. At hi... | [
"One of the most cited works in this area, Chi et al. (1981), examines how experts (PhD students in physics) and novices (undergraduate students that completed one semester of mechanics) categorize and represent physics problems. They found that novices sort problems into categories based upon surface features (e.g... |
the plot of atlas shrugged | Wow. I'm looking at thirteen complete non-answers right now. I'll try to add something constructive, but no promises.
The basic plot of the book is actually in the title. Atlas (yeah, like the book full of maps) is a figure from Greek mythology. He's what's called a Titan, a race of very old, very powerful god-like fi... | [
"Atlas Shrugged is a 1957 novel by Ayn Rand. Rand's fourth and final novel, it was also her longest, and the one she considered to be her \"magnum opus\" in the realm of fiction writing. \"Atlas Shrugged\" includes elements of science fiction, mystery, and romance, and it contains Rand's most extensive statement of... |
Is there really no way to know whether or not a shelter dog has rabies until/unless symptoms arise? | Yup. Only way to test for rabies is observation in quarantine or brain tissue. And the latter is the only real, definitive way.
> The shelter giving my dog the regular rabies vaccine for dogs wouldn't do anything if he was already infected with rabies, right?
Depends on progression of the disease.
Ideally, t... | [
"Local animal control agencies or police are sometimes able to capture the animal and determine whether or not it is infected with rabies. This is important if the dog appears sick or is acting strangely.\n",
"It can be prevented in dogs by vaccination, and cleaning and disinfecting bite wounds (post-exposure pro... |
Were there other attempts at peace during World War 1? | There were two notable attempts by the papacy to broker a peace deal. In January of 1915, Benedict XV sent a papal diplomat as an envoy to Austrian emperor Franz Joseph. That diplomat was Eugenio Pacelli (who in 1939 would be elected pope and would take the name Pius XII). The goal was to try to keep Italy out of th... | [
"The obligation to refrain from separate peace was also made during the Second World War in both camps. The Tripartite Pact between the German, Italian and Japanese governments committed the three to prosecute the war together. On the Allied camp, that obligation was contained in the United Nations Declaration of J... |
What causes the pale greenish tint we get when we are nauseous? | I googled that and got the answer pretty fast. it apparently has to do with the blood leaving your face leaving you with the yellow of your skin and the blue of your capillaries.
| [
"It may also result from inflammation or congestion of the vaginal mucosa. In cases where it is yellowish or gives off an odor, a doctor should be consulted since it could be a sign of several disease processes, including an organic bacterial infection (aerobic vaginitis) or STD.\n",
"It is caused by a defect in ... |
how did letters like g and j, or c and k, come about? why do they share a common sound? | I think it's best expressed by a quote from James Nicoll:
*The problem with defending the purity of the English language is that English is about as pure as a cribhouse whore. We don't just borrow words; on occasion, English has pursued other languages down alleyways to beat them unconscious and riffle their pockets f... | [
"For historical reasons, the consonant is written \"k\" in Czech words like \"kde\" ('where', Proto-Slavic *kъdě) or \"kdo\" ('who', Proto-Slavic *kъto). This is because the letter \"g\" was historically used for the consonant . The original Slavic phoneme changed into in the Old-Czech period. Thus, is not a sepa... |
how do sports commentators know all the players and their backgrounds so readily? i realize they are fed the info beforehand but they seem to spit out the info at appropriate times and so easily. | They typically have notes on hand during the broadcast, additionally they have a producer in the truck feeding them information. | [
"As a sports analyst you can go on different career paths within the field and even hold more than one position at once. First we have a sports journalist who reports to the public in the form of writing and includes information about sporting topics, events, and competitions. A sports commentator and sportscaster ... |
During the Cold War, why was it necessary for the USA and the USSR to build arsenals of literally thousands of nuclear weapons, enough to destroy all human life multiple times over? | This is more of a question about nuclear war strategy than history but here goes:
The buildup has to do with theories on nuclear war that require establishing enough of a strategic nuclear force to ensure a second strike capability. Theoretically, one side would attempt a counter-force first strike to nullify enemy st... | [
"At one time, the Soviet Union maintained the world's largest nuclear arsenal in history. According to estimates by the Natural Resources Defense Council, the peak of approximately 45,000 warheads was reached in 1986. Roughly 20,000 of these were believed to be tactical nuclear weapons, reflecting the Red Army doct... |
What is the "speed limit" beyond the event horizon of a black hole? | > if light crosses the event horizon of a black hole, does it speed up beyond the speed of light on its way to the center?
Not really. What happens is that past the event horizon, the escape velocity (think: how fast would something, say, a rocket, need to go to "lift off") becomes faster than the speed of light. Th... | [
"A black hole in general is surrounded by a surface, called the event horizon and situated at the Schwarzschild radius for a nonrotating black hole, where the escape velocity is equal to the velocity of light. Within this surface, no observer/particle can maintain itself at a constant radius. It is forced to fall i... |
What was the Value of a Knight and other warriors? | This is a very complicated question to answer, and there isn't really a definitive price-list for armor and weapons. I'm not sure that there is an answer at all for the Viking, as we don't really have financial records from Vikings.
For the knight, the availability of materials and quality of materials and craftsmans... | [
"Knight was described as \"a gentleman, whose eminent worth is still remembered by many now living; whose high character for upright conduct and integrity, rendered his life as honorable as it was good, and caused his death to be lamented by every one as a public loss\".\n",
"Knight has appeared or been featured ... |
why do even numbers feel safer and more pleasing than odd numbers? | Because it is more familiar to you. You have 10 fingers, 10 toes, two eyes, two ears, two arms, two legs, etc. Yes, you have one nose and one mouth but the number two satisfies your natural sense of symmetry more easily. The reason that five is comfortable is because of five fingers and five toes. | [
"For an example of odd numbers being friendly, consider 135 and 819 (\"abundancy\" 16/9). There are also cases of even being \"friendly\" to odd, such as 42 and 544635 (\"abundancy\" 16/7). The odd \"friend\" may be less than the even one, as in 84729645 and 155315394 (\"abundancy\" 896/351).\n",
"This strong dep... |
how do latrines flush away stool but get blocked because of tissie/toilet paper? | Toilets have pipes. A lot of paper will be difficult to compress and fit through those pipes. Turds, meanwhile, are relatively small and squishy. | [
"If clogging occurs, it is usually the result of an attempt to flush unsuitable items, or too much toilet paper. Clogging can occur spontaneously due to limescale fouling of the drain pipe, or by overloading the stool capacity of the toilet. Stool capacity varies among toilet designs and is based on the size of the... |
What did knights/lancers do with their lance after a successful charge? | Typically a lance is used once in a battle, you charge, the lance either becomes embedded in your target, breaks or misses, in either case you drop it and draw a sidearm for close quarters fighting. There have of course been cases where lancers or knights have wheeled around, gone back to their original starting point,... | [
"In Europe, a jousting lance was a variation of the knight's lance which was modified from its original war design. In jousting, the lance tips would usually be blunt, often spread out like a cup or furniture foot, to provide a wider impact surface designed to unseat the opposing rider without spearing him through.... |
how elevators know what floor to go to and how they stop perfectly *nearly* every single time | A certain number of rotations of the gears causes a specific change in height of the elevator. This isn't something that has any drift to it, it's pretty constant on the kind of scale we care about.
A little tuning and you have it set with all the heights. Not much to it. | [
"Elevators have a car top inspection station that allows the car to be operated by a mechanic in order to move it through the hoistway. Generally, there are three buttons: UP, RUN, and DOWN. Both the RUN and a direction button must be held to move the car in that direction, and the elevator will stop moving as soon... |
Upon launch, what kept the Space Shuttle from tilting backwards towards the orbiter? | If the rocket nozzles generate a thrust that points through the center of mass of the shuttle, then it won't rotate. | [
"The vehicle began re-entry by firing the Orbital maneuvering system engines, while flying upside down, backside first, in the opposite direction to orbital motion for approximately three minutes, which reduced the Shuttle's velocity by about . The resultant slowing of the Shuttle lowered its orbital perigee down i... |
special economic zones | It basically means the country or state has declared certain areas to have separate trade/regulation/economic policy than the rest of the country or state. It is typically done to encourage trade and boost their economy.
Here is an example. Two islandic countries fish for widgets. Country A has a socialist economy and... | [
"A special economic zone (SEZ) is an area in which the business and trade laws are different from the rest of the country. SEZs are located within a country's national borders, and their aims include increased trade balance, employment, increased investment, job creation and effective administration. To encourage b... |
After the Stanford Prison Experiment, what happened to all the ‘prisoners’ and ‘guards’ who were involved? Did any of them sue/have long term mental health issues from what went on in there? | I think it's well worth pointing out here that the Stanford experiment is highly controversial among psychologists, and the high reputation it has among the general public is by no means reflected in its reception by professionals.
There are numerous critiques of the experiment from the point of view of its design and... | [
"In the summer of 1971 a Stanford psychology professor, Philip Zimbardo, conducted a study of the psychological effects of becoming a prisoner or prison guard which is known as the Stanford prison experiment. The experiment, which was funded by the Office of Naval Research, surprised the professor by the authoritar... |
Were there "baby boomer" generations as a result of large armies returning from battle in ancient times? | Its important to remember that the Baby Boom in 1950s America was not simply caused by troops returning from WW2. Remember there was no real Baby Boom in Britain or France in response to WW2 and even within America after WW1 there was no real "boom" in population. David Faber in *The Age of Great Dreams* argues that th... | [
"BULLET::::- Baby boomers, also known as Generation W or the Me Generation, are the generation that were born mostly following World War II, typically born from 1946 to 1964. Increased birth rates were observed during the post–World War II baby boom making them a relatively large demographic cohort.\n",
"One prop... |
Were there black KKK members? | Maybe. Take a look at this 1920s [application](_URL_0_)(warning, PDF) to join the order. Note question 9: "are you of the white race or of a colored race?" Keep in mind that these forms are for vetting members. However, the question is tantalizing when we realize that the 1920s Klan, which has received the most scholar... | [
"The White Knights of the Ku Klux Klan (WKKKK) operated in the Southern District of Mississippi and elsewhere, and was a secret organization of adult white males who, among other things, targeted for violence African Americans they believed were involved in civil rights activity in order to intimidate and retaliate... |
how do sodas travel the country all carbonated but as soon as you get one alone and it shakes up, its flat?! | I would like to add that soda in its final form rarely if ever makes a cross-country trip. What happens with the big companies is they stir up the beverage base at their own place (this is JUST the flavorings and stuff), then ship *that* to the various regional bottling factories who then mix it with carbonated water, ... | [
"Home soda siphons can carbonate flat water through the use of a small disposable steel bulb containing carbon dioxide. The bulb is pressed into the valve assembly at the top of the siphon, the gas injected, then the bulb withdrawn. Soda water made in this way tends not to be as carbonated as commercial soda water ... |
How exactly is a photograph actually stored as 1's and 0's on a computer? | Let's talk about [bitmaps](_URL_0_).
The simplest case is a black and white bitmap (which will literally be a bit-map... the 0s will be black and the 1s will be white. And it will be 32 by 16 pixels.)
You have to tell the computer at least one thing about the bitmap:
1. How many pixels wide is it
So you need to pu... | [
"2. Assume the photo we take is made of 4 blocks that are adjacent to each other and we set the luminance scale for each of the 4 blocks of original photo to be 10, 100, 205, 245. Thus, the image looks like the first figure on the right. \n",
"The camera phone records pictures in JPEG format, but the Krave can al... |
irc | My favorite description of IRC has always been "Multiplayer Notepad" | [
"IRC was created by Jarkko Oikarinen in August 1988 to replace a program called MUT (MultiUser Talk) on a BBS called OuluBox at the University of Oulu in Finland, where he was working at the Department of Information Processing Science. Jarkko intended to extend the BBS software he administered, to allow news in th... |
AMA: Vikings | How far east did the Vikings go? I'm aware of the Volga Vikings and their visits to Baghdad but did they go further east? How accurate is Ibn Fadlan's description of the Ship Burial he described?
| [
"\"The Vikings\" is a British-based society of re-enactors, dedicated to the study and re-enactment of the culture of the Viking Age (790–1066) and the display of authentic Dark Ages living history and combat.\n",
"The Vikings - Vinland is an organization of Viking reenactors, consisting of 12 local member-groups... |
'weight cutting' in combat sports | Many combat sports are divided into weight classes. Being at the top of your weight class can give a slight advantage, so if you can lose a few pounds and drop into the next lower class you'll be at the top of that rather than the bottom of your original one. | [
"Fighters can cut weight for a \"day before\" fight weigh-in with modern conditioning and training methods and regain the same weight on \"day of\" the fight. The purpose of a catchweight is to compensate for the ability of bigger boxers to cut weight before a \"day before\" fight weigh-in and regain the weight to ... |
what is the point of the catcher in the rye? | There really isn't a point, if you want to know the truth. It's just this old crumby book that a whole bunch of phonies _say_ they like even though they don't really understand it for one second. You can always tell when someone's that kind of phoney 'cause they try to impress you with big talk about themes and points ... | [
"The name of Rye is believed to come from \"rie\", meaning a bank. Medieval maps show that Rye was originally located on a huge embayment of the English Channel called the Rye Camber, which provided a safe anchorage and harbour. Probably as early as Roman times, Rye was important as a place of shipment and storage ... |
how it is that we exert the same gravity on earth as earth exerts on us? | Your phrasing is a bit off. To be a bit precise, gravity attracts us and the Earth *to each other*.
The force of gravity between two objects is measured by three things: the mass (weight, for ease of reference) of the first object, the mass (weight) of the second, and the distance between their centres. That force **... | [
"The gravity of Earth, denoted by , is the net acceleration that is imparted to objects due to the combined effect of gravitation (from distribution of mass within Earth) and the centrifugal force (from the Earth's rotation).\n",
"The gravity of Earth is the acceleration that is imparted to objects due to the dis... |
Were people in Victorian times actually as weak health-wise as they are portrayed in novels from the time period? | I cannot speak to the actual, physical health of Victorians, but I did once write an answer on the related subject of why one shouldn't take representations of fainting in period fiction as just a reflection of what people were actually doing:
[How did fainting in the Victorian era become so gendered? What social conv... | [
"The status of the poor is one area in which huge changes occurred. A good illustration of the differences between life in the Georgian and Victorian eras are the writings of two of England's greatest authors, Jane Austen and Charles Dickens. Both writers held a fascination for people, society and the details of ev... |
Before Einstein, did nobody else consider there was a deep relationship between gravity and space time? | Depending on how you see it, there is also no deep relationship between gravity and spacetime in General Relativity. GR is originally just a generalization of Special Relativity, such that two reference frames relate to one another by Lorentz transformation when acceleration (which means force) is involved. This means,... | [
"In 1905, Einstein introduced special relativity (even though without using the techniques of the spacetime formalism) in its modern understanding as a theory of space and time. While his results are mathematically equivalent to those of Lorentz and Poincaré, it was Einstein who showed that the Lorentz transformati... |
What causes the scars on the ocean floor? | The long linear irregularities in your image look image look like what we call "artifacts", a direct result of the mapping techniques. Most of what we have for the vast ocean floor bathymetry is fairly low resolution, thus there is a lot of smoothing. When a ship makes a single pass through a poorly mapped area and g... | [
"A large number of injuries, up to 66%, are caused by collision with a surfboard (nose or fins). Fins can cause deep lacerations and cuts, as well as bruising. While these injuries can be minor, they can open the skin to infection from the sea; groups like Surfers Against Sewage campaign for cleaner waters to reduc... |
what is the difference between baking powder and baking soda? | The top comment is correct, but in case it's too technical:
Both baking powder and baking soda are used to create a rise in baked goods. The chemical reaction they cause makes bubbles that puff up the dough. Baking soda needs an acid added to the dough to make that reaction happen (like your grade school volcano). Bak... | [
"Many forms of baking powder contain sodium bicarbonate combined with calcium acid phosphate, sodium aluminium phosphate, or cream of tartar. Baking soda is alkaline; the acid used in baking powder avoids a metallic taste when the chemical change during baking creates sodium carbonate.\n",
"In cooking, baking sod... |
How do polarizing filters “know” the orientation of incoming photons? | It's hard to do better than this 60 Symbols video:
_URL_0_
It's not about "knowing" it's that if the incoming light is not perfectly polarized already then no matter what angle you choose it will have SOME component along that axis and that is the component that survives the filter, which is made of long conductive m... | [
"As shown in the figure, the analyzing filters are constructed of a quarter-wave plate (QWP) and a linearly polarized filter (LPF). The QWP always transforms circularly polarized light into linearly polarized light. However, the angle of polarization of the linearly polarized light produced by a QWP depends on the ... |
why are the refugees blocking the eurotunnel in callais not arrested/kicked out/processed/in france? surely they are illegally staying there too? is the french govn't just lazy or is there some technical reason? | They aren't exactly tolerated - the local police break up the camps and arrest people whenever the numbers start to rise significantly, as over this last summer. The current Mayor of Calais seems determined to see something done now that numbers are rising again, and has threatened to blockade the port if the UK doesn'... | [
"The Calais migrant crisis led to escalating tension between the UK and France in the summer of 2015. The UK blamed France for not doing enough to stop migrants from entering the tunnel or making attempts to scale fences built along the border. The British Prime Minister David Cameron released a statement saying th... |
Is there a reason that baldness in babies follows the same general pattern as Male Pattern Baldness? | I think you may have a flawed premise here. Babies generally don't follow male pattern baldness. If they have very thin hair, it is generally very uniform.
Maybe someone else can give you a better answer, but I haven't been able to find a single example of a male pattern baldness newborn for about an hour now. | [
"Although men grow hair faster than women, baldness is much more common in males than in females. The main cause for this is \"male pattern baldness\" or androgenic alopecia. Male pattern baldness is a condition where hair starts to get lost in a typical pattern of receding hairline and hair thinning on the crown, ... |
I read about children working underground in coal mines during the Industrial Revolution. Is that accurate? | Until 1842, children did work underground in substantial numbers.
[An accident at Huskar Colliery in Silkstone](_URL_1_), near Barnsley in 1838 clearly shows this. A stream overflowed into the ventilation drift after violent thunderstorms causing the death of 26 children; 11 girls aged from 8 to 16 and 15 boys betwee... | [
"Boys in the Pits: Child Labour in Coal Mines is a 2000 book by Robert McIntosh, published by McGill-Queen's University Press. The book is about child labour in Canada in the 19th and early 20th centuries, with special reference to the history of boys, aged 8 to 15, who worked in coal mines. These boys worked under... |
A question on Cosmic Radiation and Electromagnetic Shielding | While the earth's magnetic field does help with cosmic rays, you are forgetting the massive attenuation that occurs due to our atmosphere. | [
"This radiation originates from outside the solar system and consists of ionized charged atomic nuclei from hydrogen, helium and uranium. Due to its energy the galactic cosmic radiation is very penetrating. Thin to moderate shielding is effective in reducing the projected equivalent dose but as shield thickness inc... |
why can a light tap or flick or what have you on my testicles hurt pretty bad, but ball-slapping sex doesn't hurt at all? | Well, during ball slapping sex, things hurt less. Hormones, adrenaline, etc. For me at least, it's common for them to be a bit sore after. | [
"Loss of blood flow is one of the biggest risks in cock and ball torture (CBT), which can be seen with loss of color and edemas. Bondage in which the testicles are tied to something else is especially dangerous, increasing the risk of the testicles getting damaged through excessive tension or pulling.\n",
"Blue b... |
why we can't see a full circle rainbow? | Because of the physical properties of rain droplet, the light entering and leaving forms an angle of about 42^(o). That means a rainbow is going to be a ring "around" the sun at 180^o - 42^o = 138^(o), or 42^o from the point exactly opposite the sun. Since that point is below the horizon, the earth itself blocks the ... | [
"From above the earth such as in an aeroplane, it is sometimes possible to see a rainbow as a full circle. This phenomenon can be confused with the glory phenomenon, but a glory is usually much smaller, covering only 5–20°.\n",
"A rainbow is not located at a specific distance from the observer, but comes from an ... |
why do sites sometimes give an error, but if you refresh it a second after it works? | Here's an example.
Let's assume the Google server that I access is in California. I type something into a Google search bar, hit search, and it goes from here in New York State to the Google California Office in 13 milliseconds (0.013 seconds).
The server in California then has to look for what I put in, which takes ... | [
"Once an accessibility audit has been conducted, and accessibility errors have been identified, the errors will need to be remediated in order to ensure the site is compliant with accessibility errors. The traditional way of correcting an inaccessible site is to go back into the source code, reprogram the error, an... |
Reading about the WWII pacific theather. Why the huge difference in losses? | A fast deteriorating supply situation for the Japanese and the industrial might and adaptibility of the US happend. What followed was what always follows when ideology, honor culture and courage clashes with superior firepower.
Quite simply, the IJN didn't surrender when almost any other force would have. They fought... | [
"The Battle of Midway, in June 1942, brought Nagumo's near-perfect record to an end. The First Air Fleet lost four carriers during the turning point of the Pacific War, and the massive losses of carrier aircraft maintenance personnel would prove detrimental to the performance of the IJN in later engagements. The lo... |
why is it called the "secret service" when it isn't secret at all? how did they get that name officially? | In 1865, the "Secret Service Division" of the US Treasury Department was formed as a federal police agency devoted to investigating and preventing money counterfeiting, which was a huge problem at the time. In it's early years it ended up doing all kinds of law-enforcement and intelligence/counter-intelligence duties. ... | [
"The U.S. Secret Service is charged with protecting the president and the first family. As part of their protection, presidents, first ladies, their children and other immediate family members, and other prominent persons and locations are assigned Secret Service codenames. The use of such names was originally for ... |
if horse racing tips had any merits, why wouldn't the bookies adjust their odds to match? | Betting on horse races is fairly straight forward. If more people bet on a particular horse because they think it has a good chance to win, odds will adjust. The horses with low odds stay that way because few people will bet on them. The bookies do adjust the odds, in horse racing and pretty much any sporting event. | [
"Betting exchanges compete with the traditional bookmaker. They are generally able to offer punters better odds because of their much lower overheads but also give opportunities for arbitrage, the practice of taking advantage of a price differential between two or more markets. However, traditionally, arbitrage has... |
what is that carbon fiber pattern? why is it so appealing? | Carbon fibers have extreme tensile strength to weight ratio. This is good in that a light weight component can support a larger load. However, its strength is highly directional i.e. it is strong only in one direction. So the fibers are woven into a matrix like the pattern you see commonly. The pattern also varies by t... | [
"Carbon fiber is of interest due to its widespread use in composite materials. Provided there are closed loops of carbon within the composite structure, eddy currents can be induced in the material. Unidirectional carbon fiber composites can have poor susceptibility when fiber to fiber contact is limited.\n",
"Th... |
- water towers | Water towers make it so that, instead of pumping water *all* the time, you just have to pump water to the top of the tower. This means you can still get water when the power goes out, and that's very important in areas where the power is likely to go out. | [
"A water tower is an elevated structure supporting a water tank constructed at a height sufficient to pressurize a water supply system for the distribution of potable water, and to provide emergency storage for fire protection. In some places, the term standpipe is used interchangeably to refer to a water tower. Wa... |
why do some foods taste just as good (or better) as leftovers the next day, when others are horrible? | It's hard to generalize it because it's different for each food. A lot of chemical processes happen constantly even after food is cooked, and it depends on it's chemical makeup, how it was cooked, how it was stored, and how it was reheated.
Firstly, reheating anything often ends up cooking it as well. Some foods care... | [
"Conditioned taste aversion is the only type of conditioning that only needs one exposure. It does not need to be the specific food or drinks that cause the taste. Conditioned taste aversion can also be attributed to extenuating circumstances. An example of this can be eating a rotten apple. Eating the apple then i... |
"Blacks" or "African-Americans"? | You might split the difference and go with Black Americans. No one is likely to get mad about that sort of thing in an undergrad paper so long as you're making a good faith effort. Also the general trend is to [capitalize the B in Black Americans](_URL_0_) these days, though that is a hot topic. | [
"African Americans (also referred to as Black Americans or Afro-Americans) are an ethnic group of Americans with total or partial ancestry from any of the black racial groups of Africa. The term typically refers to descendants of enslaved black people who are from the United States.\n",
"Black and African America... |
does massage really work to get rid of the 'knots'? what are the knots and why do you sometimes feel worse after a deep tissue massage? | Actual scientific explanations of knots:
_URL_0_
_URL_1_
_URL_3_
and massage:
_URL_2_
**ELIF version-** "Knots" are caused by a damaging muscle/connective tissue combined with swelling/sensitivity from the following immune response. From the papers above, massage often doesn't work in controlled trials, massage ... | [
"BULLET::::- Friction massage is said to increase mobilization of adhesions between fascial layers, muscles, compartments and other soft tissues. They are thought to create an inflammatory response and instigate focus to injured areas. A 2012 systematic review found that no additional benefit was incurred from the ... |
why is the australian dollar so weak against the british pound? | No, the Aussie dollar is pretty strong against the pound, currently sitting at 55 pence.
It is always a mistake to compare currencies absolute values, as these are a result of history. The difference in this case is because Australia switched to decimal currency back in 1966, and with currency being more valuable back... | [
"The value of the Australian pound remained tied to the pound sterling. Inflation in Australia thus increased, less than in Britain, but more than in the United States. The case for a central bank was increased by the need for the government to cut spending after the war to reduce its debt. Commonwealth Bank Govern... |
Why does water that you carry feel heavier than water that you consumed? | When you drink it, the water is at the near center of your body, in your backpack it's not. There i more support at the center of your body so it feels lighter. Carrying it on your back also requires a posture that is harder to maintain and thus requires more energy and may exhaust your muscles more. | [
"The buoyancy force is equal to the weight of the body, in other words, the mass of the body is equal to the mass of the water displaced by the body. This adds an upward force to the body by the amount of surface area times the area displaced in order to create an equilibrium between the surface of the body and the... |
How certain are we of what year it is? Were there every any disagreements, like during the Dark Ages or afterwards, of the exact year? | Well, it's one thing to be off by a day or so, but by a year? That's a massive mistake for an entire population to make. But it wasn't until 525 AD that the AD numbering system began. And there are a couple discrepancies in figuring out when Jesus was born, to start counting. The gospels (for those who take them lit... | [
"Year 229 (CCXXIX) was a common year starting on Thursday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Severus and Cassius (or, less frequently, year 982 \"Ab urbe condita\"). The denomination 229 for this year has been used since the early... |
meta plea to eli5 about the upcoming elections. | Also, can we have active moderation? ELI5 will have more and more questions of the "push-poll" variety as the election nears. It will become unusable if half of the posts are "ELI5 why Mitt Romney hates gay babies" and "ELI5 how President Obama can hold office if he's a secret Kenyan Nazi?" | [
"In 2003, the IOP launched the National Campaign for Political and Civic Engagement, working collaboratively with other schools and organizations across the country to engage young people. The IOP also conducts research and surveys into the political views of America's young voters. In addition, the Institute offer... |
why does it take minutes to take money from my bank account but days to put it back? | What takes minutes is the authorization for somebody to take money from your account, not the time for the money to actually be removed from yours and into theirs. However, once a transaction has been authorized, your bank will show your account as having that much less money, so it can seem like it is final to you (an... | [
"Once a current account has been opened with a new bank or building society, the Current Account Switch Service will transfer all the activity relating to the old account to the new one. That includes moving incoming and outgoing payments, and transferring the account balance, as well as closing the old account. An... |
what is "doping" in cycling and why is it illegal? | Doping in cycling typically refers to the use of any kind of performance enhancing drug. The actual term doping, I believe, comes from the term "blood doping" which means to artificially increase your red blood cell count. A lot of cyclists that have been caught cheating recently have been using something called EPO wh... | [
"\"The sport of road-race cycling (and it may not be the only one) is like an alcoholic, refusing to accept that it has a problem, as long as it drinks in secrecy. That fact was shamefully proved once again this week when the sport's governing body — the International Cycling Union (UCI) - forced the 1999 Tour to a... |
why have desktop app stores not gotten similar development as mobile app stores? | Developers don't like app stores. They take a 30% cut, restrict what your app can do, make you wait to get your app released, don't allow upgrade versions, etc. You don't get direct access to your customer, you can't get their email to try and sell them more crap.
On most mobile devices developers don't have any choi... | [
"Most companies have acknowledged the potential of Mobile Apps to increase the interaction between a company and its target customers. With the fast progress and growth of the smartphone market, high-quality Mobile app development is essential to obtain a strong position in a mobile app store.\n",
"The launch of ... |
How does a single membrane in an earphone generate multiple frequency sounds at the same time instant? (For example, high hats with vocals) | When a complex sound or mixture of sounds is heard, there is really only one wave that hits your ear. The waves of sound in the air are able to interfere both destructively and constructively, and the function of the final wave is the sum of those of all the individual waves. The result is not a series of waves traveli... | [
"If two sounds of two different frequencies are played at the same time, two separate sounds can often be heard rather than a combination tone. The ability to hear frequencies separately is known as \"frequency resolution\" or \"frequency selectivity\". When signals are perceived as a combination tone, they are sai... |
nowadays we are starting to use more paper products than plastic (straws , bags etc) will this his not create a problem in the future because paper is made out of trees ? | I think the idea is that we can farm trees, wood is a renewable resource. Also so long as this wood isn’t burnt and instead is turned into paper, it should in theory soak up CO2 from the atmosphere and leave us better off. | [
"A 2007 report into shopping bag alternatives noted that paper bags were less environmentally friendly than plastic bags due to a higher carbon footprint. Similarly, cotton bags were unsuitable due to the pesticides used and high volume of water needed to create them. The \"greenest\" option was using recycled plas... |
how can only one jet engine fly a twin engine airplane for hours after the other has shut down? | For large passenger jets, the aircraft is designed to be able to fly with one engine shut down (an “in-flight shutdown, or IFSD). That’s why they’re designed with at least two engines.
There’s a concept called ETOPS (Extended Twin Engine Operations, or, more humorously, “Engines Turn Or People Swim”) which means tha... | [
"Early American twinjet designs were limited by the FAA's 60-minute rule, whereby the flight path of twin-engine jetliners was restricted to within 60 minutes' flying time from a suitable airport, in case of engine failure. In 1964, this rule was lifted for trijet designs, as they had a greater safety margin.\n",
... |
It's generally understood that a good deal of dangerous animals have bright colors to act as a "warning" (poison dart frogs, coral snakes, etc.), but aren't most of their natural predators colorblind? Wouldn't this diminish the effectiveness of this defense mechanism? | Birds (which are common predators of insects and frogs) have some of the best vision and color detection of any animal. If they were colorblind we wouldn't have colorful birds (color helps them mate and show dominance), because the duller colored ones would be less likely to be eaten by predators, and thus color would... | [
"Poisonous species often use bright colouring to warn potential predators of their toxicity. These warning colours tend to be red or yellow combined with black, with the fire salamander (\"Salamandra salamandra\") being an example. Once a predator has sampled one of these, it is likely to remember the colouration n... |
the whole controversy around goldman sachs. | Read Griftopia. Sorry, it's not that simple. That's why it went on for so long. | [
"Goldman has been criticized in the aftermath of the financial crisis of 2007–2008, where some alleged that it misled its investors and profited from the collapse of the mortgage market. That time in Goldman's history brought investigations from the United States Congress, the United States Department of Justice, a... |
What causes a gun barrel to rise when I shoot? If I hang upside-down and shoot, will the barrel "rise" away from the anchor point (i.e. my feet) or away from the source of gravity (i.e. the Earth)? What would happen if both are absent (i.e. in space)? Or is something else going on? | The bullet doesn't leave along the line that passes the center of the gravity for the gun. Because of this, the device will experience a torque from the gas that pushes back in the firing chamber, and it will attempt to begin rotating, which is what you should see in space. | [
"The pivoting part that supports the cylinder is called the crane; it is the weak point of swing-out cylinder designs. Using the method often portrayed in movies and television of flipping the cylinder open and closed with a flick of the wrist can in fact cause the crane to bend over time, throwing the cylinder out... |
what makes an expensive product so expensive? is it more related to the brand, or the materials? | It's really depends on the product. Some are expensive because of the brand, some are expensive because of msterials. But both and neither can apply.
The better question is what product are you refering to? | [
"Some luxury products have been claimed to be examples of Veblen goods, with a positive price elasticity of demand: for example, making a perfume more expensive can increase its perceived value as a luxury good to such an extent that sales can go up, rather than down.\n",
"This situation is derived by the desire ... |
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