question stringlengths 3 301 | answer stringlengths 9 26.1k | context list |
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Is there enough food for everyone in the world? | There's more to this complex topic than politics. There's also transportation issues, more people in the world having access to meat which is less efficient for feeding people, people honestly not caring and the like. Hunger does kill roughly [17,000 children](_URL_2_) around the world per day.
Here's a [good paper](_... | [
"At the 1996 World Food Summit, governments reaffirmed the right to food and committed themselves to half the number of hungry and malnourished from 840 to 420 million by 2015. However, the number has increased over the past years, reaching an infamous record in 2009 of more than 1 billion undernourished people wor... |
What is the maximum frame rate and resolution on a computer monitor or TV before it makes no difference to the human eye? | > Does it even make sense for an 8k camera to exist?
Even if the resolution of an image is indiscernable at lifesize, that doesn't mean higher resolutions are useless. To take a simple example, imagine you make a very large print of a picture you have taken. Then fine details that would be blurry at low resolution w... | [
"Computer displays with aspect ratios wider than 4:3 are also called widescreen. Widescreen computer displays are typically of the or aspect ratio. Widescreen (16:9) monitors can be found in resolutions of 1024×576, 1152×648, 1280×720, 1366×768, 1600×900, 1920×1080, 2560×1440 and 3840×2160. Apple's 27\" iMac introd... |
What are some good resources for translating Mesopotamian cuneiform into English? (xpost r/cuneiform) | I am not sure what you mean by "employ an ancient symbol(s)", but assyriologists use a couple of different standard sign lists for getting from cuneiform signs to a Latin alphabet equivalent. Keep in mind, however, that this is only one step; an additional step is necessary in order to translate the transliterated sign... | [
"The Journal of Cuneiform Studies was founded in 1947 by the Baghdad School of the American Schools of Oriental Research. The journal presents articles about ancient Mesopotamian language and history in English, French and German.\n",
"Muss-Arnolt's \"Concise Dictionary of the Assyrian Language\" was completed in... |
if i play sports that are challenging for my joints, will they get stronger from the work out, or will they get bad (especially if pain shows up when i get older)? | Muscles (including the ones that support ligaments, and therefore our joints) can get stronger. Joints and the soft tissue that surround them cannot. If you play a sport, or engage in an activity that puts consistent loads or includes twisting and turning on your joints, you run the risk of injury. You can mitigate tha... | [
"In general, studies have shown that physical exercise of the affected joint can noticeably improve long-term pain relief. Furthermore, exercise of the arthritic joint is encouraged to maintain the health of the particular joint and the overall body of the person.\n",
"Loose or lax ligaments in turn are not capab... |
how do the autonomous regions of spain work in relation to the national government? | It is similar to states, in that autonomous regions can enact their own laws if those laws mesh with national laws.
Spain's monarchy doesnt matter much, as it is primarily lead by a Prime Minister (not the King).
All autonomous communities have a parliament (Legislative Assembly, Council of Gov't and High Court of Ju... | [
"Since the creation of autonomous communities, the Government of Spain appoints a special representative to the region, the Government Delegate, part of the Peripheral State Administration. Unlike other single-province autonomous communities, the Government also appoints the Government Sub-delegate, the successor o... |
"eli5" how is the flame shaped behind a rocket. | These cones are commonly called shock diamonds and is present in all jet engines not only rocket engines. A jet engines nozzle is designed to output an exhaust at a specific velocity and pressure. Ideally the pressure would be the same as ambient pressure. However, especially for rocket engines that is designed to oper... | [
"In the original version of the facility, flames were directed in a trench beneath the rocket in two opposite directions. In December 1955, workers installed a new more durable elbow-shaped flame deflector designed by Rocketdyne engineer Carl Kassner. Water injected through small holes in the elbow quickly turned t... |
why would a beverage have both sucrose and sucralose in it? | It's likely related to the well-known "sugar tax" being levied by various governments, US included. Drinks with sugar levels above a certain limit are subject to additional taxation.
Removal of X% sugar, and replacement with sucralose, will take it below that level. | [
"A variety of beverages call for sweetening to offset the tartness of some juices used in the drink recipes. Granulated sugar does not dissolve easily in cold drinks or ethyl alcohol. Since the following syrups are liquids, they are easily mixed with other liquids in mixed drinks, making them superior alternatives ... |
Did the Vikings really perform the "Blood Eagle" on christians, or is it just a myth? | [Here is a previous thread](_URL_0_) that answers this question. The answer is probably not. | [
"Roberta Frank reviewed the historical evidence for the ritual in her \"Viking Atrocity and Skaldic Verse: The Rite of the Blood-Eagle\", where she writes: \"By the beginning of the nineteenth century, the various saga motifs—eagle sketch, rib division, lung surgery, and 'saline stimulant'—were combined in inventiv... |
does marijuana have side-effects/withdrawal symptoms like controlled-substance medications such as xanax? if not, why is the latter available legally in every state (with prescription)? | Wow, some really awful replies in this thread, I'll try to get a clearer picture.
It's very important to recognize that cannabis is not a single chemical like Xanax. The plant can include any of some 60 psychoactive chemicals, all with their own effects. In addition, the exact percentage of those chemicals which are b... | [
"There have also been reports of a strong compulsion to re-dose, withdrawal symptoms, and persistent cravings lasting up to a week after taking synthetic cannabinoids, indicating that synthetic cannabinoids may be significantly more addictive than marijuana. The greater addictiveness and more severe adverse effects... |
A question or two on Jellyfish | Hmmm I wish someone answered these questions. They seem quite interesting! | [
"Given that jellyfish is a common name, its mapping to biological groups is inexact. Some authorities have called the comb jellies and certain salps jellyfish, though other authorities state that neither of these are jellyfish, which they consider should be limited to certain groups within the medusozoa.\n",
"The... |
In High School I was taught WW2 began because of the Treaty of Versailles. However on /r/warcollege and /r/shitwehraboossay the users often point out the Germans not only came out of WW1 economicly strong but that the Germans sabatoged their economy. Can someone expand? | There are two things to disentangle here.
Firstly, much of what the two subreddits mentioned are doing is tackling popular misconceptions about the Versailles Treaty and the impact of reparations upon the German economy. In short, the popular view is that it was a Carthaginian peace in which the Versailles Treaty imp... | [
"British economist John Maynard Keynes denounced the 1919 Treaty of Versailles as ruinous to German and global prosperity. In his book \"The Economic Consequences of the Peace\". Keynes said the Treaty was a \"Carthaginian peace\", a misguided attempt to destroy Germany on behalf of French revanchism, rather than t... |
why are pesticides meant to kill insects and rodents also poisonous to humans? | Because we are very close relatively speaking in terms of evolution. We are, in a broad sense, not "very" different to each other. That's why it's hard. For example, Nicotine (and caffeine) were created by plants to attack insect "brains" and those molecules also bind to humans brains. But it can be done!, one example ... | [
"Many pesticides achieve their intended use of killing pests by disrupting the nervous system. Due to similarities in brain biochemistry among many different organisms, there is much speculation that these chemicals can have a negative impact on humans as well. \n",
"Pesticide use is also a major threat to arthro... |
suppose you live in Italy in 90 BCE. would you (likely) think of yourself as entirely Roman, or would you still identify as whatever culture (etruscan, latin, ect) your ancestors had belonged to before the romans conquered them? | In 90 BCE most likely (it is a current debate among historians what actually was going on, and when I finish my dissertation I'll tell you what actually was going on) didn't consider themselves Roman citizens - certainly not in a legal sense, and possibly not in an ethnic sense. The coins of the rebel confederation in... | [
"The Ancient peoples of pre-Roman Italy – such as the Umbrians, the Latins (from which the Romans emerged), Volsci, Oscans, Samnites, Sabines, the Celts, the Ligures, the Veneti and many others – were Indo-European peoples, most of them specifically of the Italic group. The main historic peoples of possible non-Ind... |
Post Roman Britain ruins | Hi there. /u/itsallfolklore and I discussed what is essentially your question [here](_URL_0_).
The TL/DR of that is that the Anglo-Saxons were extremely aware of *who* built the Roman sites around England, and often *how*, and lamented the fact that they were often unable to replicate them. The use of Roman sites was... | [
"After the Roman withdrawal from Britain around 410, the area of Mamucium was used for agricultural purposes. It has sometimes been identified with the listed among the 28 cities of Britain by the \"History of the Britons\" traditionally attributed to Nennius. After lying derelict for centuries, the ruins were comm... |
why is the 5-pointed star so prevalant on flags & in militaries | The pentagram has been a popular symbol since ancient times. There are a few theories about why this might have happened:
* It is possible to draw a pentagram in one go. It might have been a symbol of continuity or endlessness, much like a circle, just more fancy looking. This might also explain while the pentagram ha... | [
"Other symbolic interpretations have been offered based on the account of its design by Paul M. Levy. The five-pointed star is used on many national flags and represents aspiration and education. Their golden color is that of the sun, which is said to symbolize glory and enlightenment.\n",
"There are four red six... |
Why did the Germanic word France replace the Latin name Gaul, but the Latin name Germany survive against the German name Deutschland? | The Latin name Gaul originally referred to the people of modern northern Italy and southeastern France, and gradually came to apply to a much larger area as the Romans expanded their control.
The Latin name Germania was how Caesar referred to the tribes that attacked across the Rhine.
The French say "Allemagne", whic... | [
"The name \"Germany\" and the other similar-sounding names above are all derived from the Latin \"Germania\", of the 3rd century BC, a word simply describing \"fertile land\" behind the limes. It was likely the Gauls who first called the people who crossed east of the Rhine \"Germani\" (which the Romans adopted) as... |
Why has the Colombian armed conflict lasted so long? | Because is has ceased to be a political conflict and is about power and destabilization to protect drug interests. [This article](_URL_0_) discusses the FARC involvement in the trade from 13 years ago. It is now a financial life line for FARC. Most of their charismatic leaders are dead. Their power base ends outsid... | [
"The Colombian conflict started in 1964, although systematic violence in the country can be dated since the end of the 19th century (Thousand Days' War). The National Liberation Army (ELN) is one of the most prominent participants of the ongoing conflict. For decades, residents of Bogotá lived in fear of being a vi... |
Eli5 has asked where the term "Russian Roulette" comes from, but the answers are a mess. Historians, is there any historical explanation for the term? | Sources conflict:
- *[Brewer's Dictionary of Phrase and Fable](_URL_0_)* says that *"the practice was popularized by Russian officers at the Tsar's court in the months before and during the 1917 Revolution, when the term is first recorded."* But they don't give a source, and don't say *where* it was first recorded.
... | [
"The original Russian-language full title was Сказка про шута, семерых шутов перешутившего (\"Skazka pro shuta, semerykh shutov pereshutivshevo\"), meaning \"The Tale of the Buffoon who Outwits Seven Other Buffoons\". The spelling \"Chout\" is a French romanization of the Russian word шут meaning \"buffoon\".\n",
... |
If I had an electric chain saw, and then accidentally sawed the electric cord, would I get shocked? | The short answer is yes, it is possible. In order to disable the chainsaw, you have to cut through either the live or neutral line. So there may be a brief or sustained period where the chainsaw housing becomes live.
However, there are simply too many variables to be able to say whether you would receive an electric s... | [
"The overhead electric wires were brought down by gunshots. A policeman was seen throwing a tear-gas bomb which did not explode, and then firing at the electric wire, resulting in a burning coil falling on him. The foreign delegates who attended the conference had also confirmed that the police had fired into the a... |
How did Scandinavians shift from being plundering Vikings to the seemingly sensible folk they are perceived as today? | First, it is important to note that all Scandinavians was not plundering Vikings, most of them was in fact farmers, fishers and hunters. Furthermore, those that actually travelled was not only raiders, they were traders, explorers, colonizers and even mercenaries too. It is also important to know that it had not always... | [
"At that point, the Scandinavians had entered their medieval period and consolidated their kingdoms of Denmark, Norway, and Sweden. This period marks the end of significant raider activity both for plunder or conquest. The resurgence of centralized authority throughout Europe limited opportunities for traditional r... |
Is there any cost increase for ISP's in increasing download speeds ? | That's entirely based on whether they have to invest in infrastructure ( routers, switches, cabling, etc ) or if the structure is already there.
Example. I worked for Comcast in 2007. Their entire network up until the last mile before your home is fiber optic. They could quite literally flip a switch and boost speed... | [
"With increased consumer demand for streaming content such as video on demand and peer-to-peer file sharing, demand for bandwidth has increased rapidly and for some ISPs the flat rate pricing model may become unsustainable. However, with fixed costs estimated to represent 80–90% of the cost of providing broadband s... |
trading 'futures' in the stock market | "Futures" are contracts for the future delivery of an item. Instead of buying a farmer's onions that he just harvested, I invest in the onions that he has yet to grow. The farmer can use the investment on his farm right away, which might help the harvest, and it tends to stabilize the price. | [
"A futures exchange or futures market is a central financial exchange where people can trade standardized futures contracts; that is, a contract to buy specific quantities of a commodity or financial instrument at a specified price with delivery set at a specified time in the future. These types of contracts fall i... |
If I have two insulated bottles one contains water that is 10 degrees c lower than room temp. The other 10 degrees warmer. Which will become room temp faster / slower. | Practically, both will reach room temperature at the same time.
Theoretically, the warmer one might reach it slightly faster because it starts out less dense, and therefore starts with less mass, but the difference is likely negligible. | [
"When a stratified hot water storage tank has closed water circuits, the water temperatures can be up to 90 to 95 °C at the top and 20 to 40 °C at the bottom. Calm, undisturbed water is a relatively poor heat conductor when compared to glass, bricks and soil.\n",
"In tropical countries, like Singapore and India, ... |
Historians, how do you deal with sad moments of History? (written records, images, films, etc) | I often end up crying during my research. Due to the area I study I focus specifically on the 'lighter' topics within it, and even those can be very distressing. However, I think I'd be extremely worried if it didn't phase me. When you're seeing the personal experience of someone who you have a 'connection' with throug... | [
"A novelist such as Sir Walter Scott or Leo Tolstoy (\"War and Peace\") would describe historical events accurately. They would give rein to their imagination only in scenes that were not significant historically, when interactions with fictional characters could safely be introduced.\n",
"The scene is set in 197... |
will my teeth move after braces are removed? | Nah, at least not significantly in 10 days. Putting the retainer on the first time might be uncomfortable because of the minute movement, but if you wear it properly afterwards it will keep it in place.
It is important you're not lazy with your retainer though. Many people have to get braces for a second time because ... | [
"Braces have constant pressure which, over time, move teeth into the desired positions. The process loosens the tooth after which new bone grows in to support the tooth in its new position. This is called bone remodeling. Bone remodeling is a biomechanical process responsible for making bones stronger in response t... |
Is the production of bio-fuels viable? | Some biofuels use [waste vegetable oil](_URL_1_) from restaurants although this is a smaller niche market.
I've seen [these people](_URL_0_) at fast food restaurants. | [
"The depletion of petroleum sources and increase in greenhouse gas emissions in the twenty and twenty-first centuries has been the driving factor behind the development of biofuels from microorganisms. \"E. coli\" is currently regarded as the best option for biofuel production because of the amount of knowledge ava... |
how do they determine what age group of kids is safe for a specific toy? does the administration just say what they think is right or is there actually a scientific way to determine this? | In the United States there are regulations that spell out how toys for children need to be tested and how the safe age range should be determined. Most toy manufacturers have to submit toys for third party testing and then certify the results in a Children's Product Certificate. The United States Consumer Product Safet... | [
"Manufacturers often display information about the intended age of the children who will play with the toy. In the U.S. this label is sometimes mandated by the CPSC, especially for toys which may present a choking hazard for children under three years of age. In most countries the intended age is either shown as a ... |
How much ammo did the typical Napoleonic era musket man have? | Amendment: My original calculations on rate of fire were based on a company and then incorrectly widened to a battalion. A company fires 108 shots a minute on average, with a battalion firing 648.
Hello There,
I am going to use my knowledge of the Habsburg military during the war of 1809 as an example. I hope othe... | [
"For example, the Brown Bess musket, in service with the British army from 1722 to 1838, had a 19 mm (.75 inch) smoothbore barrel, roughly the same as a 10 gauge shotgun, and was long, just short of the above recommended 168 cm (5 feet). On the other hand, records from the Plymouth colony show a maximum length of 1... |
Can DNA be made using L-sugars? | Yes you can! It is called L-DNA, as opposed to naturally occurring D-DNA. You can even [buy it](_URL_1_). It retains all of the base pairing rules, but the helix chirality is reversed. As a result, L-DNA will not hybridize with a complementary strand of D-DNA.
It has potential uses in biological systems because it is... | [
"While DNA, RNA and proteins are all encoded at the genetic level, there exists a separate system of trafficked molecules in the cell that are not encoded directly at any direct level: sugars. Thus, glycobiology is an area of dense research for chemical biologists. For instance, live cells can be supplied with synt... |
How did medieval Islamic historians write about/conceptualise the history of their religion? Please also tell me about who wrote history in the medieval Islamic world, why, and what written history was used for in medieval Islamic society. | Islamic history was, like Jewish and Christian history, originally preserved orally. As these oral histories were passed on, early Muslims attached special importance to whom they heard these stories from. As such, each of these early religious traditions, known technically as [*hadith*](_URL_2_) consists of both a tex... | [
"In the medieval Islamic world (13th century), universal history in this vein was taken up by Muslim historians such as Tarikh-i Jahangushay-i Juvaini (\"The History of The World Conqueror\") by Ala'iddin Ata-Malik Juvayni, Jami al-Tawarikh (\"Compendium of Chronicles\") by Rashid-al-Din Hamadani (now held at the U... |
What is the white thread-like substance found under a scab? | [Fibrin](_URL_0_).
It's a fibrous matrix protein that polymerizes to cover open wounds as part of the clotting response. | [
"The formation of this stain is the subject of ongoing research. It was originally speculated that it represented body contents forced out by the pressure of overlying rocks, although decay contents would form more quickly and thus be a more likely interpretation. This is supported by their presence around organism... |
why do humans find it necessary to try and control how others live their lives even when it doesn't affect them personally? | We are a social species that evolved to live in villages of under 300 people. So we have evolved instincts designed to ensure our place in the hierarchy, and to regulate and stabilize the group. When you live in a small village, *everyone's* behavior affects you personally.
| [
"Speaking of personal control, in many circumstances, people usually cannot directly control social conditions or institutional practices that effect their daily lives. People would then try by one means or another to get those experts who are resourceful or who can produce influence and power to act at their behes... |
why when you look sideways at a moniter it looks like a picture negative? | Nope, it's just LCD monitors. LCD stands for "liquid crystal display", because there is a layer of an electrically reactive liquid, enclosed in tiny little cells, over the top of the screen. When the liquid is activated, it turns dark, blocking out a pixel of color. As you move to the side, instead of looking straig... | [
"Because camera lenses invert the image and flip it left to right, orienting the film strip so that the image's \"up\" is up, and its \"left\" is to the left, the left-eye image of the stereo pair is to the viewer's \"right\" (see the included photograph). Note that in the Realist 45 the film cartridge is loaded on... |
why won't companies like valve make games such as half life 3 which would pretty much guarantee them unimaginable profits? is there another reason for not doing it apart from the risk of it not being that good? | Valve is making money hand over fist with Steam. Half Life 3 has impossible expectations to live up to so I'm sure they'll wait until the risk doesn't outweigh the reward. Why risk messing things up right now when they're doing really well?
Square long ago said they would never remake FF7. They're now remaking FF7 ... | [
"Several of Valve's series feature only two primary games, such as \"Half-Life\" and \"Half-Life 2\". With no apparent announcements of a third title in these series, Valve has acquired a joking reputation for being unable to count to 3. In the absence of an official announcement of a \"Half-Life 3\", players and j... |
Why is the American West of the 1800s portrayed as a desert? | The vast majority of the American West cannot support agriculture without irrigation - often involving water from wells. It is a dry place, and this reality sets it apart from the other North American regions. It is depicted as a dry place because that is what it is. There are obvious exceptions to this, notably the Pa... | [
"Settlers in the regions east of the Missouri River had found ample trees with which to build log houses. The eastern quarter of Nebraska was also well supplied with timber. However, as settlers moved further west, they encountered the treelessness that had led Major Stephen H. Long, exploring the region in 1820, t... |
why do you always need a resistance in front of a led even if the voltage is lower than the max the led can handle? | The issue is that for an LED a small change in voltage can mean a very large change in current. For the resistor a change in voltage produces an equivalent change in current, different from an LED. You can't really know how much current is going through an LED at a given voltage except by testing, so you really need to... | [
"This is also a problem where the LEDs are using individual resistors instead of shared resistors, if there is a path through two LEDs that has less LED drop than the supply voltage these LEDs may also illuminate at unintended times.\n",
"Resistors of extremely high precision are manufactured for calibration and ... |
What is the particle physics behind the triple point of a substance? | From the point of view of thermodynamics (basically, looking at the system as a whole) the triple point is the point at which 3 phases of matter all have the same energy so matter can freely change between the 3 states.
On the scale of a single molecule, thermodynamic properties (such as the phase of matter) are not r... | [
"In thermodynamics, the triple point of a substance is the temperature and pressure at which the three phases and solid of that substance coexist in thermodynamic equilibrium. It is that temperature and pressure at which the sublimation curve, fusion curve and the vaporisation curve meet. For example, the triple po... |
Is heterochromia the result of transposoable elements? | I wouldn't apply that concept to humans right away. We are much more complex than corn and have mechanisms in place in our DNA to combat things like this since this could be death to us if we had random genes jumping around willy nilly in us. Heterochromia can be the result of many causations like genetic mutation (mos... | [
"Heterochromatin mainly consists of genetically inactive satellite sequences, and many genes are repressed to various extents, although some cannot be expressed in euchromatin at all. Both centromeres and telomeres are heterochromatic, as is the Barr body of the second, inactivated X-chromosome in a female.\n",
"... |
Is there any scientific basis for the claims of "r/nofap" on their FAQ page? | There is such thing as numbed pleasure response, it occurs when dopamine releasing behaviour happens, it usually only occurs after an excess. | [
"Several journalists have criticized NoFap after having participated in its programs. According to Elizabeth Brown, neuroscientists have questioned some of the claims made by people on NoFap. One psychologist, David J. Ley, wrote: \"I'm not in opposition to them, but I do think their ideas are simplistic, naive and... |
why doesn't gravity have an opposite, like the other fundamental forces? | Gravity is just the manifestation of the curvature of space. Gravitons (particles that convey gravity) might exist, but we haven't found them yet, and assuming they do doesn't help this explanation.
It's not possible for a human only exposed to a 3D universe to fully grasp higher dimensional curving of space (we can c... | [
"Gravity is the weakest of the four fundamental interactions of physics, approximately 10 times weaker than the strong interaction, 10 times weaker than the electromagnetic force and 10 times weaker than the weak interaction. As a consequence, it has no significant influence at the level of subatomic particles. In ... |
Can animals become friends? | This story could be true. Our cat had four kittens, one of which started sleeping beside our dog at a very young age. They were completely inseparable and the kitten (who was very healthy and in no way a runt) had very little to do with its siblings, preferring to spend all its time with the dog.
As it grew older the ... | [
"Mutualism can contribute to the formation of interspecies friendships because it involves a pair of organisms experiencing mutually beneficial exchanges with each other which may lead to a long-lasting bond. The mutualistic relationship observed between coyotes and badgers after hunting ground squirrels together i... |
why do videos playback/appear smoother on my phone when the brightness is all the way down and the lights are off? | It has more to do with how your brain interprets visual data. The low brightness makes it harder to notice small little hiccups in playback, so you have an easier time perceiving it as smooth motion. | [
"Higher refresh rates, while they reduce flicker, may cause other problems. Simply redisplaying the fields may cause judder, particularly on fast moving images, as the image is displayed repeatedly in the same location, rather than moving smoothly. Conversely, interpolation (which avoids judder and may create more ... |
what's wrong with developing downtowns? | You'll have to give more details.
Who is saying there is a problem developing downtowns? What are their arguments?
Most people involved in urban design and development would argue that developing downtowns is the best thing that a city or region can do to improve its finances, reduce car congestion, and increase q... | [
"The city's economic growth can be witnessed in the extensive vertical growth experienced across many of its neighborhoods. The construction boom is reflected in the many high density residential towers, shopping malls, elevated highways, the metro expansion and overall increase in commercial activity.\n",
"Numer... |
why military forces use standard-capacity magazines for their rifles if there are magazines with much higher capacity? | Simplicity, low cost and, often overlooked, the means to carry, exchange and manage magazines in the heat of battle would be my guesses.
Very large capacity mags tend to be bulky and heavy. | [
"Magazines come in many shapes and sizes, from tubular magazines on lever-action rifles that may hold several rounds, to detachable box and drum magazines for automatic rifles and machine guns that may hold more than one hundred rounds. Various jurisdictions ban what they define as \"high-capacity magazines\".\n",
... |
Are sociopaths born that way, or "formed" through dramatic childhoods/experiences? | Both. There is a genetic predilection towards whether someone is a sociopath but the genes responsible (those we suspect based on genome wide association studies) are neither perfectly predictive nor required. That unpredictability implies conditioning is also important in the development of sociopathy. I should als... | [
"Personality also affects the development (or lack of development) of adult psychopathology as a result of childhood abuse. Individuals who scored low in neuroticism exhibit fewer negative outcomes, such as psychopathology, criminal activity, and poor physical health, after exposure to a potentially traumatic event... |
[Math][Physics]How can the Many-World Interpretation make meaningful statements about probability when infinity is involved? | Your main question is really a math one: if we have an uncountably infinite number of possible outcomes x, how do we define probabilities? This is done using a [probability density function](_URL_0_) p(x). Then the probability that x will be between the values a and b will be given by
P(a < x < b) = ∫*_a_*^(b) p(x) dx... | [
"Modern mathematics generally incorporates infinity. For most purposes it is simply used as convenient; when considered more carefully it is incorporated, or not, according to whether the axiom of infinity is included. This is the mathematical concept of infinity; while this may provide useful analogies or ways of ... |
why is artificial light used to grow plants on iss instead of the sun? | If you leave the window shades up all the time, you will heat the inside of the ship up a lot. Additionally, you'd only get light on the plants half the time since you're going around the earth every 90 minutes. Finally, with LEDs you can control the wavelength and intensity of light to optimize growth conditions. | [
"In recent years LED technology has been introduced into the grow light market. By designing an indoor grow light using diodes, specific wavelengths of light can be produced. NASA has tested LED grow lights for their high efficiency in growing food in space for extraterrestrial colonization. Findings showed that pl... |
how do movies go from the raw footage (film or digital) to 4k? | With digital recordings, the raw footage is usually higher quality than 4K (IIRC, 8K is fairly common). For final release, you just render the video in the release quality and write it to the DVD or blu-ray (or digital download/streaming service).
With film, we're lucky because film is actually very high quality. Peop... | [
"Digital movies made in 4K may be produced, scanned, or stored in a number of other resolutions depending on what storage aspect ratio is used. In the digital cinema production chain, a resolution of 4096 × 3112 is often used for acquiring \"open gate\" or anamorphic input material, a resolution based on the histor... |
if fish are cold blooded, how do some species function at depths of over 900 meters where the temperatures are 0-3 degrees celsius? | Fish have a unique chemistry. It has been determined that often their blood is similar to antifreeze. This makes them able to function at colder temperatures than a lake trout or some similar surface water species. | [
"Most fish are ectothermic (\"cold-blooded\"), allowing their body temperatures to vary as ambient temperatures change, though some of the large active swimmers like white shark and tuna can hold a higher core temperature.\n",
"Coldwater fish species survive in the coldest temperatures, preferring a water tempera... |
how did the pdf format become so popular? | First, there was a need for a way to represent paper online. A PDF is a decent approximation of a paper document as it will print to actual paper without any issues. The PDF is an early example of "What You See Is What You Get", or WYSIWYG. This became handy when people would need to send print documents over electroni... | [
"Adobe Systems made the PDF specification available free of charge in 1993. In the early years PDF was popular mainly in desktop publishing workflows, and competed with a variety of formats such as DjVu, Envoy, Common Ground Digital Paper, Farallon Replica and even Adobe's own PostScript format.\n",
"PDF's adopti... |
What was the Russian reaction to the finding of gold in Alaska? | Hey there, /u/usaf2222. There wasn't any "oh, damn" moment, if that's what you're asking. From the perspective of the Russian-American Company, gold was actually a headache.
Russian officials were aware of traces of gold on the Kenai Peninsula as early as the 1840s, when engineer and [geologist Peter Petrovich Doroshi... | [
"It was believed by 20th century prospectors that the early Russian traders discovered gold in a tributary to the Kuskokwim called \"Yellow River\" in 1832. Many think that the Yellow River these traders referred to is the Aniak River. A mercury deposit was discovered by Russian traders near the trading post called... |
explain to me how stocks work, what makes the price go up/down? | Also, you can think about companies like cows, and buying stock like buying part of a cow (and buying part not in the sense of the tail of the hooves, but owning a certain portion of the money the cow generates). The cow can make you money in two ways:
1) Whenever the cow is milked the owners of the cow can give you s... | [
"The price of assets such as stocks is set by supply and demand. By definition, the market balances buyers and sellers, so it is impossible to have \"more buyers than sellers\" or vice versa, although that is a common expression. In a surge in demand, the buyers will increase the price they are willing to pay, whil... |
Were there any signs of the native American tribes moving towards unification before the arrival of Europeans? | Well, first you'll want to consider that the indigenous people of the Americas are nowhere near a homogenous unit. The differences in culture, language and societal structure between a Pequot village in Connecticut and a Blackfoot band in Montana are (speaking unscientifically) as great as any between Eurasian peoples.... | [
"The Cuu-ma-as, Klehkoot and Muhuulaht people decided to amalgamate prior to the European’s (or any other groups) arrival to the territory. This decision was made because each of the tribes were at war with the Coast Salish people and they thought that joining the three tribes would make them stronger in their war ... |
Will a mixture of two different liquids, distributed into two beakers in a closed system, eventually separate into pure liquids in each beaker via vapour? | A fully separated mixture is a very low entropy state. If the system is being driven by thermal fluctuations, it is very unlikely that it will evolve to such a state. For that to occur, there has to be an internal energy benefit to separation (such as buoyancy in a centrifuge). | [
"Equal mixtures of liquid and below will separate into two immiscible phases due to their dissimilarity (they follow different quantum statistics: atoms are bosons while atoms are fermions). Dilution refrigerators take advantage of the immiscibility of these two isotopes to achieve temperatures of a few millikelvin... |
Ok so this might be a dumb question but in WW1 why didnt the americans use Winchester lever actions instead of the bolt actions they used? | The lack of lever actions in frontline service prior to WW1 by most Great Powers is due to a variety of factors largely relating to doctrine. The US in particular had a lot of driving reasons that paralleled concerns of most other powers, but exacerbated by the country's unique circumstances between the Civil War and W... | [
"Due to the higher rate of fire and shorter overall length than most bolt-action rifles, lever-actions have remained popular to this day for sporting use, especially short- and medium-range hunting in forests, scrub, or bushland. Lever-action firearms have also been used in some quantity by prison guards in the Uni... |
why do all big music artist's youtube channel's names end with vevo? | "Youtube/Google was in danger of being sued by Sony Music/UMG music. To prevent a potentially devastating lawsuit, Google's CEO (at the time) Eric Schmidt made a deal with Doug Morris, CEO of Sony Music, to build a parallel video platform based on YouTube tech where Sony could control the monetization settings and sell... | [
"Unlike AKB48 and HKT48 (which release full versions of previous single, whenever a new one is released), SKE48 does not release full versions of their music videos on YouTube as of 2011, due to restrictions imposed by Avex Trax, which currently belongs. A short version of music video was published on March 7. The ... |
] what is the volcker rule, and how does it operate? | So, it's actually really simple but the formal legislation is so complicated because of politicians.
It means that banks that take deposits (Like JPMorganChase) cant participate in proprietary trading. What is prop trading? It's basically trades that are purely for JPMorgans books/profits (basically, what a hedge fund... | [
"The Volcker Rule refers to § 619 of the Dodd–Frank Wall Street Reform and Consumer Protection Act (). The rule was originally proposed by American economist and former United States Federal Reserve Chairman Paul Volcker to restrict United States banks from making certain kinds of speculative investments that do no... |
Does There Exist A Series Smaller than the Harmonic Series that STILL Diverges? | Relative growth rate of series
---
Yes, there is a way to talk about how fast a series converges or how slowly a series diverges. Let's consider only series with positive terms. So a*_1_*, a*_2_*, ..., a*_n_*, ... is a positive sequence and the partial sums
> s*_n_* = a*_1_* + ... + a*_n_*
are positive and increas... | [
"The harmonic series can be counterintuitive to students first encountering it, because it is a divergent series even though the limit of the th term as goes to infinity is zero. The divergence of the harmonic series is also the source of some apparent paradoxes. One example of these is the \"worm on the rubber ban... |
How were Roman provincial governments setup? | I'm a little confused by what you mean here. What are military provinces exactly? There's no such class of provinces in Roman law. Do you mean the Imperial Provinces of the Principate, which housed legions and whose administrators were directly appointed by the emperors, as opposed to the Senatorial Provinces whose adm... | [
"As part of the Constitutional Reforms of Augustus which transformed the Roman Republic into the Roman Empire all Roman provinces where divided into imperial provinces and senatorial provinces. Imperial provinces were those border provinces which required a permanent military presence to protect the Empire from inv... |
do planets get smaller with time? | Just the opposite, actually. Continuous meteor impacts make planets gain mass over time. Eventually though all suns explode, and the planets around them scatter to dust. | [
"The great orbits of the planets take longer than the shorter: Saturn and Jupiter take many years, Mars two, whereas the Moon takes only a month. Jupiter's moons take even less. This is not changed if the Earth rotates every day, but if the Earth is stationary then we suddenly find that the sphere of the fixed star... |
why are spell checkers still not aware of grammatical issues? | Complexity.
Here's a computer's spell checking algorithm.
For each word in document
If word does not appear in dictionary
highlight it
compare closest word matches based on percentage and position of letters
include mouseover window or other view to show and allow selec... | [
"Grammar checkers are considered as a type of foreign language writing aid which non-native speakers can use to proofread their writings as such programs endeavor to identify syntactical errors. However, as with other computerized writing aids such as spell checkers, popular grammar checkers are often criticized wh... |
why is addition so much easier to do than subtraction in your head? | Practice. I noticed this when I was a kid, too. And noticed teachers always gave more add/multiply homework than subtract/divide, which seemed (still does) backwards to me. | [
"Addition or subtraction is performed in a single step, with a turn of the crank. Multiplication and division are performed digit by digit on the multiplier or divisor digits, in a procedure equivalent to the familiar long multiplication and long division procedures taught in school. Sequences of these operations c... |
as a british person who has never used or had dealings with comcast, what is so bad about them? | [This minute and a half long silly YouTube video is actually a really great explanation of the Cable Industry here in the US](_URL_0_) | [
"Comcast is frequently the subject of criticism. Customers of the telecommunications company report low levels of customer satisfaction on both service and cost. Comcast has also had several customer service scandals, the most notorious of which featured a representative not allowing a customer to cancel his servic... |
what is the purpose of the turnable dial around the face of a watch? | The ring as we know it today on some watches, also called rotating bezel, actually dates to the first diving watches of the 1950's. At the time, using a stopwatch was impossible, because every additional pusher could further compromise water-resistance, so instead they relied upon the bezel as a basic timing apparatus.... | [
"BULLET::::- The button on the top right is the \"Light\" button which is used to illuminate the display in the dark. It is also used it set the figures backwards when the watch is in time adjusting mode.\n",
"The face of the watch reads \"World Time\" and the top and \"Illuminator\" on the bottom of the outer ca... |
why can't software companies make an update/download/install status bar that moves evenly and accurately reflects the percentage of the task that is actually complete? | As a programmer, it's difficult to know how long each process may take in a multi-step process. And processes may take different amounts of time on different machines. So generally, the idea is to just keep the bar moving to let the user know stuff is still happening. Perhaps if there is time and funding, the developer... | [
"A more detailed listing of software enhancements is below, grouped by their value to Analytics or OLTP workloads, or their impact on Availability. Similar enhancements cannot be duplicated on other platforms because they require software and API modifications and integration across database software, operating sys... |
why is a photocopying machine so huge compared to a normal colour printer? | There are very small photocopiers too.
On the large ones, most of the extra size is for complex paper handling: several large supplies of different sizes of paper; a collator that can make 10-20 separate copies of a whole document; sometimes an auto-stapler; a high-speed jam-resistant paper feeding and duplexing mecha... | [
"The DPI measurement of a printer often needs to be considerably higher than the pixels per inch (PPI) measurement of a video display in order to produce similar-quality output. This is due to the limited range of colors for each dot typically available on a printer. At each dot position, the simplest type of color... |
What evolutionary advantage do bacteria gain by producing highly lethal toxins? | In some cases, poisons cause the host to excrete bacteria everywhere, getting it in the water supply and infecting others. Lots of diaharreal diseases work this way. Sure, the host may be killed but many more may be infected. On the other hand, many non-parasitic bacteria produce toxins. These may be to keep away c... | [
"Bacteriophages are very specific, targeting only one or a few strains of bacteria. Traditional antibiotics have more wide-ranging effect, killing both harmful bacteria and useful bacteria such as those facilitating food digestion. The species and strain specificity of bacteriophages makes it unlikely that harmless... |
where do our sweat glands pull water from when we sweat? | Yes, it mostly comes from blood (and tissue fluid, which is blood without the cells that takes nutrients all the way to your cells). The sweat glands actively pump out salts into your pore and water follows by osmosis. | [
"Myoepithelial cells form a smooth muscle lining around the secretory cells; when the muscles contract, they squeeze the secretory ducts and push out the accumulated fluid into the hair follicle. Sweat and sebum are mixed in the hair follicle and arrive mixed at the epidermal surface. The apocrine sweat is cloudy, ... |
does frequency of life change during refraction? | > So how can the frequency of the light beam change to different frequencies?
It doesn't. The "white" light beam was actually made up of many different frequencies all going along together. A prism is dividing up already separate things like you would sort a bag of M & Ms, not splitting something which was a cohesiv... | [
"There is a cut-off frequency above which the equation formula_23 can no longer be satisfied. The refractive index formula_4 varies with frequency (and hence with wavelength) in such a way that the intensity cannot continue to increase at ever shorter wavelengths, even for very relativistic particles (where v/c is ... |
Is it true that all elements/chemicals/things metallize at high pressures? | I believe so. Things become metals because the valence band of electrons overlaps the conduction band. This happens when you squeeze things.
Here are a few examples
[Water](_URL_0_)
[Nitrogen](_URL_1_)
[Oxygen](_URL_3_)
[Helium](_URL_2_)
[Hydrogen](_URL_4_)
[Sulfur](_URL_5_) | [
"In physics, a metal is generally regarded as any substance capable of conducting electricity at a temperature of absolute zero. Many elements and compounds that are not normally classified as metals become metallic under high pressures. For example, the nonmetal iodine gradually becomes a metal at a pressure of be... |
When a man urinates from a standing position into a toilet, will less splash back be generated if he aims for the water or the dry porcelain? | If you kind of hit the side of the bowl at an angle there is little splash. | [
"Toilets without cisterns are often flushed through a simple flush valve or \"Flushometer\" connected directly to the water supply. These are designed to rapidly discharge a limited volume of water when the lever or button is pressed then released.\n",
"Washout, or \"Flachspüler\" (\"shallow flush\"), toilets hav... |
why is it when you’re sick and can’t keep water down that something like sprite or ginger ale will stay down? | Answer: ginger has some medicinal properties that help deal with nausea or indigestion. Pop drinks also have a lot of sugar in them, which is a quick source of energy when you're sick and unable to keep food down. So a flat ginger ale gives you the benefit of soothing your stomach a bit and giving you some energy to ke... | [
"2. Laugh, Basil, Laugh - When Basil comes down with a cold, Johnny and Ginger discover that the best way to make a sick Sprite feel better is to make them laugh. Johnny sings a song about all the things to make someone laugh, but it doesn't work, but Basil laughs when Johnny does silly yoga poses. \"Make Someone L... |
why do military ship names begin with uss, hms, etc.? | They signify what country's military they represent.
USS = United States Ship
HMS = Her/His Magesty's Ship, meaning UK.
HMCS = Her Majesty's Canadian Ship
| [
"The names of commissioned ships of the United States Navy all start with USS, for \"United States Ship\". Non-commissioned, primarily civilian-manned vessels of the U.S. Navy under the Military Sealift Command have names that begin with USNS, standing for \"United States Naval Ship\". A letter-based hull classific... |
why do networks like abc,nbc,etc "partner" with comcast or other providers to view shows online. | Broadcast networks make lots of money selling carriage licenses to cable companies which allow those companies to include the channels in their lineups.
By limiting the audience of free in-season streaming video, broadcast networks are keeping their partners happy. When video is completely freely available, there's l... | [
"Comcast delivers third-party television programming content to its own customers, and also produces its own first-party content both for subscribers and customers of other competing television services. Fully or partially owned Comcast programming includes Comcast Newsmakers, Comcast Network, Comcast SportsNet, Sp... |
How can non-locality avoid violating causality? | The trick is information is never actually transmitted via entanglement. Thus, causality is never broken since you can't actually influence anyone outside your lightcone. In other words, entanglement can only ever produce correlated results, but each result is truly independent and random and you'd never know something... | [
"Some philosophers believe that causality may not exist if determinism is true, as causality is merely the observation that one event precedes another, or that there is a pattern throughout spacetime in which events of one similar type tend to correlate with events of another similar type (that is, the mass-energy ... |
How do we know that entangled particles don't have predetermined spins from the very start? | This is known as the "hidden variable" hypothesis. In fact, there's ways to test this, designed by John Bell in the 20th century. If your suggestion is true, then if we run a very carefully designed kind of spin-measuring experiment many times, we would find a different proportion of outcomes than if the spins are only... | [
"The paradox is that a measurement made on either of the particles apparently collapses the state of the entire entangled system—and does so instantaneously, before any information about the measurement result could have been communicated to the other particle (assuming that information cannot travel faster than li... |
When you look up at the night sky at you see a single star, how many photons are entering your eye so that you can see that one star? | The Sun has [apparent magnitude](_URL_2_) -26.74, and the dimmest star we can see with the naked eye is magnitude +6. That's a magnitude difference of 32.74, meaning the Sun is about 12 trillion times brighter (as viewed from Earth). Since the Sun is radiating [1361 Watts per square meter](_URL_0_) on Earth, that dimme... | [
"If we assume a 10 m diameter ideal ground-based telescope and an unresolved star: every second, over a patch the size of the seeing-enlarged image of the star, 35 photons arrive from the star and 3500 from air-glow. So, over an hour, roughly arrive from the air-glow, and approximately arrive from the source; so th... |
why do high scoring posts (top all time) get archived so you can't vote on them? | all reddit posts are archived after 6 months
theres not difference between a high scoring post and a low scoring one | [
"BULLET::::- Upvote/Downvote: Up and down votes were essentially user ratings on a given yak. For a post to become popular it had to receive more upvotes than downvotes, at which time it displayed a positive number next to it. If votes on a post reached a value of -5, it was permanently deleted.\n",
"Once the tim... |
is there a specific reason clocks go clockwise? | Probably because they were modeled after sundials. | [
"Clocks traditionally follow this sense of rotation because of the clock's predecessor: the sundial. Clocks with hands were first built in the Northern Hemisphere (see \"Clock\"), and they were made to work like horizontal sundials. In order for such a sundial to work north of the equator during spring and summer, ... |
saturn's 'storm' | > Monster storms rip across the northern hemisphere of Saturn once every 30 years or so, or roughly once per Saturn year.
> "We think this huge thunderstorm is driving these cloud particles upward, sort of like a volcano bringing up material from the depths and making it visible from outside the atmosphere,"
_URL_0... | [
"Dragon Storm is located in Saturn's Southern hemisphere, which is labeled as the \"Storm Alley\" region. The storm can have a range of and more. The Dragon Storm is a dramatic giant thunderstorm that can be compared to the electric thunderstorms on Earth. It acquires its energy in the deep layers of Saturn's atmos... |
why don't musicians and performers yawn or hiccup on stage ever? | Classical music performer for 8 years here:
It happens more than you think. I've seen people take small naps on stage, vomit, pass out, etc. The reason it doesn't happen more though is probably because when performers are on stage, their brain focuses on the performance itself and anything else gets put aside. | [
"Clive Barnes of the \"New York Times\" observed, \"The people involved are talented enough...So what went wrong? How did \"Enter Laughing\" end up leaving us yawning?\" He noted composer/lyricist Stan Daniels was a producer of \"The Mary Tyler Moore Show\" and suggested \"he should stay where he is well off...when... |
Where did the KKK get its bizarre titles for its hierarchy, such as "Imperial Wizard," "Grand Goblin," "King Kleagle," and "Cyclops"? | According to a history I read about them, the Klan started out as kind of a lark. The idea was to be mysterious and scare people with the idea that they were the ghosts of dead Confederate soldiers, which turned into intimidating "free" black people really quickly. But the idea was more to be a secret society and gentl... | [
"The principle villain, the Wizard Wutz, is another unusual character for Oz: a handsome, smooth, graceful but pure-evil villain who commands a hierarchical organization of subversives, with planted spies in positions of power all over the land of Oz, and a systematic collective strategy for overthrowing the govern... |
With all of the testing done on mice, roughly how long do you think we could keep one alive in captivity? Assume cost is no issue. | _URL_0_
This is a challenge to figure out exactly that. | [
"The life span of nude mice is normally 6 months to a year. In controlled, germ free environments and with antibiotic treatments found in many laboratories that routinely use nude mice, they can live almost as long as normal mice (18 months to two years).\n",
"House mice usually live less than one year in the wil... |
what function do insects like ticks serve in nature? | Evolution does not require a "function" in order to justify an animal existing in a niche, it's not all part of some unseen designer's "plan".
Ticks have a niche because there are things for them to eat. Perhaps one could argue that this keeps "something worse" from filling the niche, but that's just humans seeking a... | [
"Ticks are invertebrate animals in the phylum Arthropoda, and are related to spiders. Ticks are in the subclass Acari, which consists of many orders of mites and one tick order, the Ixodida. Some mites are parasitic, but all ticks are parasitic feeders. Ticks pierce the skin of their hosts with specialized mouthpar... |
Are there more protons, neutrons, or electrons in the universe? How do the three rank by abundance? | I think [this thread](_URL_0_) may be of interest to you! u/fishify says that there are about 7 times as many protons as neutrons in the universe. If we assume that most protons are in atoms and not ions, then it would make sense that there is about one electron for every proton.
This agrees with what u/nivlark said. | [
"According to the current models of big bang nucleosynthesis, the primordial composition of visible matter of the universe should be about 75% hydrogen and 25% helium-4 (in mass). Neutrons are made up of one up and two down quarks, while protons are made of two up and one down quark. Since the other common elementa... |
why do you have to refrigerate eggs from the grocery store but you don't have to if you get them fresh from a farm? | There is a membrane that comes out of the chickens that cover the egg. In the US, its standard to have the manufacture plant wash and sanitize them, but in places like the UK, they don’t so they can leave their eggs on the counter or shelf for a while. | [
"All egg products sold in the U.S that are pasteurized due to the risk of food-borne illnesses are done per U.S. Department of Agriculture rules. They also do not allow any egg products to be sold without going through the process of pasteurization. They also do not recommend eating shell eggs that are raw or under... |
Why did human life originate in Africa instead of elsewhere? | You may consider posting this question in r/askscience instead, as historians (mostly) work with written evidence. | [
"This suggests that, rather than modern humans arising in East Africa around 200,000 years ago, it appears that humans may already have been present across the length of Africa 100,000 years earlier. According to Jean-Jacques Hublin, \"The idea is that early \"Homo sapiens\" dispersed around the continent and eleme... |
Why was Octavian chosen as Caesar's heir? Why wasn't his son chosen? Of course, Agustus had him killed later on, so I'm curious as to why a protector ship wasn't set up instead. | It has to do with the fact that Octavian was purely roman noble blood and ceasarean was half Egyptian. There was also the fear that Caesarian wasn't actually ceaser's son. | [
"Antony sent an announcement of the donations to Rome, hoping that the Senate would confirm them, which it refused to do. Octavian's political position was threatened by the acknowledgement of Caesarion as legitimate and heir to Caesar's name. Octavian's base of power was his link with Caesar through adoption, whic... |
why coffee is not considered as a drug even though it's one of the ten most addictive substances in the world? | Caffeine is a drug.
These are the first lines of its wikipedia page:
> Caffeine is a central nervous system (CNS) stimulant of the methylxanthine class. It is the world's most widely consumed psychoactive drug. Unlike many other psychoactive substances, it is legal and unregulated in nearly all parts of the world. | [
"Dating to the 1970s, coffee has been incorrectly described by many, including historian Mark Pendergrast, as the world's \"second most legally traded commodity\". Instead, \"coffee was the second most valuable commodity exported by developing countries,\" from 1970 to circa 2000. This fact was derived from the Uni... |
Were any people of colour present during the evacuation of Dunkirk? If so, how many? | This question has been asked a lot recently. I discussed it [here](_URL_0_), but there's always more to be said. | [
"In the Second World War, ten of the fleet of sixteen ships were commandeered for active duty, four of which were lost. The Dunkirk evacuation was perhaps the company's finest hour, with \"Mona's Isle (IV)\" being the first to leave Dover and the first to complete the round trip during the evacuation. Eight company... |
why should we care about the depreciation of a new car? | A car is not an investment. You are always going to lose money on it. But you may chose to lose more or less money. | [
"The yearly depreciation of a car is the amount its value decreases every year. Normally a car's value is correlated with the price it has on the market, but on average a car has a depreciation around 15% to 20% per year. Depending on market conditions, cars may depreciate between 10-30% the first year.\n",
"Unli... |
why is apple flavoured candy always green when red apples are far more prevalent? | Firstly, depends on where you live, red maybe more prevalent to you. Red is used for strawberry and cherry as they don't have alternates, leaving green as a good option for apples.
| [
"Candy apples, also known as toffee apples outside of North America, are whole apples covered in a hard sugar candy coating. While the topping varies from place to place, they are almost always served with a wooden stick of sorts in the middle making them easier to eat. Toffee apples are a common treat at autumn fe... |
Do paper airplanes "fly" using the same principles as actual airplanes? | Pretty much anything can produce lift depending on its angle of attack, the profile mainly affects how efficiently it will produce that lift.
A sheet of plywood for example can produce a decent amount of lift depending on the angle, its just that its going to produce a lot of drag at the same time. | [
"A paper plane, paper aeroplane (UK), paper airplane (US), paper glider, paper dart or dart is a toy aircraft (usually a glider) made out of paper or paperboard; the practice of constructing paper planes is sometimes referred to as aerogami (Japanese: kamihikōki), after origami, the Japanese art of paper folding.\n... |
why do some online stores have different regions? | It's due to copyright related issues, one different companies can hold the rights to the same book in different regions, for example that upcoming Star Trek series was licensed to Netflix in every other country than the United States.
Sometimes it is also due to legal issues, e.g. games with Nazi symbols may not be so... | [
"Shopping hubs, or shopping centers, are collections of stores; that is a grouping of several businesses in a compact geographic area. It consists of a collection of retail, entertainment and service stores designed to serve products and services to the surrounding region.\n",
"Products may be out stock in relati... |
why does it take amazon several days to "prepare" items for shipment? | Okay, you know how a mailman comes to your house every day, it's kinda like that for amazon, except instead of your house, it is a warehouse with thousands and thousands of items shipped every day.
If you order it later in the day, you've likely missed the delivery company's pickup, so you have to wait till the next ... | [
"In April 2014, Amazon began a service for shipping non-perishable grocery store items into a single box for delivery for a flat fee. The service is available in the United States, the United Kingdom, Germany, Austria, India, Japan, Italy, Spain, and France.\n",
"A customer orders a parcel from Amazon and has it ... |
why do i hear no music when i push an earbud deeper into my ear? | Earbuds make sound by making waves in the air between the speaker and your eardrum.
If you seal the ear canal tight and compress the air even tighter, the speaker needs to work harder to make waves. Cheap earbuds under low voltage can't move the air. | [
"In an interview with Los Angeles magazine, he revealed, \"I’m 80 percent deaf in my left ear. People trip out on that. I was born that way, so I just roll with it. But if you listen to the records in your headphones or your car stereo, I tend to pan my favorite instruments to the right because that’s what I can he... |
why do you have to dunk what you're frying first in flour then egg then bread crumbs and sometimes back to egg and a second round of bread crumbs? | “Dry sticks to wet” is as simple as I can explain it.
Flour sticks to wet surface of, say, chicken
Egg is used to make the surface wet again and also helps to adhere the bread crumbs. It’s like a glue. If you just dunked the chicken directly in the bread crumbs alone, they wouldn’t stick.
Second round is for extra c... | [
"Once the flour was done, it was mixed with water to make dough. The dough was widened to round, flat sheets and placed on hot rocks over a fire. When done baking, a tortilla was produced; it was the most important staple available to them.\n",
"When there are problems with the breading separating from the meat w... |
What role do harmonics hold in Acoustic Levitation? | Depending on what you mean by harmonics the answer could either be "none" or "location."
The acoustic levitation I'm most familiar with uses a standing wave to levitate an object at the pressure nodes. If your question is how multiples of the input frequency make a difference for acoustic levitation, then the answer s... | [
"The practice of acoustic levitation would not be possible without understanding nonlinear acoustic phenomena. The nonlinear effects are particularly evident due to the high-powered acoustic waves involved.\n",
"In an electric power system, a harmonic is a voltage or current at a multiple of the fundamental frequ... |
why are there so many immigrants coming across the mediterranean sea? | Because their cost/benefit calculation (likely based on incomplete information) tells them it's a good option. Lots of parts of the middle east are very unstable, and offer poor economies and life chances. Lots of parts of Africa have few jobs, and lots of young people. They know that if they stay put, their likely lot... | [
"Ascertaining motivation is complex, but, according to the United Nations High Commissioner for Refugees, most of the people arriving in Europe in 2015 were refugees, fleeing war and persecution in countries such as Syria, Afghanistan, Iraq and Eritrea: according to UNHCR data, 84 percent of Mediterranean Sea arriv... |
Possible to change the temp of a liquid by stirring? | Absolutely. One of Joules experiments was using a [weight powered whisk to heat water](_URL_0_). He was extremely careful in his work, including things like losses in the string, to arrive at what was for the time incredibly precise results.
However the temperature change was subtle because water takes a lot of energy... | [
"The liquid is then heated to about 85° C. Upon reaching this temperature, a total of 200 grams of potassium peroxydisulfate (KSO) in portions of about 40 grams each is added at intervals of, for example, 1 hour. After addition of the final portion of oxidant, stirring is continued for 3 hours. The product is then ... |
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