question stringlengths 3 301 | answer stringlengths 9 26.1k | context list |
|---|---|---|
is inflation necessary? could we have a functional economy without it? | A small amount of inflation is necessary for a healthy economy because it incentivizes people to invest their money now because to not do so would devalue their money in the future.
Example if inflation is at 1% per year, then if you have $100 at the start of the year it will be worth less than $100 at the end of the ... | [
"Inflation affects economies in various positive and negative ways. The negative effects of inflation include an increase in the opportunity cost of holding money, uncertainty over future inflation which may discourage investment and savings, and if inflation were rapid enough, shortages of goods as consumers begin... |
Is a magnetic field just an electric field from a different frame? | Permanent magnets consist of a bunch of atoms (or molecules) of some material, and the [magnetic dipole moments](_URL_1_) of these atoms (or molecules) are aligned in such a way to give a net magnetic field. These dipole moments are due to the [quantum mechanical spin](_URL_0_) (and orbital angular momentum) of particl... | [
"The above transformation rules show that the electric field in one frame contributes to the magnetic field in another frame, and vice versa. This is often described by saying that the electric field and magnetic field are two interrelated aspects of a single object, called the electromagnetic field. Indeed, the en... |
Why are there not more instances of primitive 'tanks' prior to WW1? | There were a variety of so-called 'proto-tanks' in the years leading up to WWI, notably in France and Britain. The one which comes to mind is the Burstyn 'Tank', an armoured vehicle designed by an officer in the Austro-Hungarian Army.
The problem that these designs posed were the same as those of the actual first Bri... | [
"Tank armour has progressed from the Second World War armour forms, now incorporating not only harder composites, but also reactive armour designed to defeat shaped charges. As a result of this, the main battle tank (MBT) conceived in the Cold War era can survive multiple RPG strikes with minimal effect on the crew... |
why do people drown? | If you don't know proper swimming technique, it is actually very difficult to keep yourself afloat. Once your head starts dipping into the water, your reflexes do the wrong things for what you actually need to do. Eventually you exhaust yourself to the point you cannot keep yourself afloat. | [
"Active drowning: People, such as non-swimmers and the exhausted or hypothermic at the surface, who are unable to hold their mouth above water and are suffocating due to lack of air. Instinctively, people in such cases perform well-known behaviors in the last 20–60 seconds before being submerged, representing the b... |
Did a soldiers swordsmanship/skill really matter in large medieval battles? | More can always be added to a topic and I really hope more will be. It's a great question but it also reminded me of a somewhat similar question that had been asked here before. As I tried to find it I stumbled upon a couple of others:
**1.** [*Did medieval sword fights really look as 'expert' and 'choreographed' as w... | [
"It is a vexed issue as to what extent specialized arms and armour were used in mêlée tournaments. A further question that might be raised is to what extent the military equipment of knights and their horses in the 12th and 13th centuries was devised to meet the perils and demands of tournaments, rather than warfar... |
Did the Confederacy weaken themselves by setting their capital in Richmond, so close to the enemy? | I think it's much ado about nothing, basically. Richmond, as the south's second city (behind New Orleans) and center of industry, would have been a vital target for the Union and a locus of Confederate defense in any case. The Confederacy would quite literally have been incapable of maintaining their armies without the... | [
"Because of its strategic significance, the Confederacy relocated its capital to Richmond. Richmond was at the end of a long supply line and as the highly symbolic capital of the Confederacy became the main target of round after round of invasion attempts. A major center of iron production during the civil war was ... |
why dont limbs grow back? | Think of repairing a cut as a result of a function, rather than the body consciously knowing it needs to repair it. When you break the skin barrier and hit blood, the blood is being pumped by the heart and bleeds out of the cut, where it clots and hardens when it is exposed to the air. Then over time your body regenera... | [
"If the processes involved in forming new tissue can be reverse-engineered into humans, it may be possible to heal injuries of the spinal cord or brain, repair damaged organs and reduce scarring and fibrosis after surgery. Despite the large conservation of the Hox genes through evolution, mammals and humans specifi... |
Why do motorcyclist lean at an angle while cornering? | Essentially it's because of the centrifugal force. Now, to be sure, this force is not "real" in an inertial frame but is fine to talk about it as if it was real if we consider the rest frame of the motorcyclist. If you're in a car in a turn you feel as though you're thrown into the side of the car due to this "force". ... | [
"Much of the art of motorcycle cornering is learning how to effectively push the grips into corners and how to maintain proper lean angles through the turn. When the need for a quick swerve to one side suddenly arises in an emergency, it is essential to know, through prior practice, that countersteering is the most... |
why exactly movies are released on br/dvd waaay after the release? | It is an agreement so that the movie studios can make more money. By having a tiered release it allows the studios (and industries) to make more money off the release of a movie.
If a movie was released in theaters, on BR/DVD, on HBO/Showtime, and on Netflix all at once, most everyone would just watch it on the easies... | [
"Because the film is in the public domain, DVD releases of it are available from a number of companies, including Alpha Video, CATCOM Home Video, Critic's Choice, Dollar Entertainment, Image Entertainment, Ovation Home Video, Reel Enterprises, ROAN, Syngery Enterprises, Unforgettable and Vina Distributors. It is al... |
how do facial oil absorbing sheets work? | Not sure but - I believe it’s made out of a natural fibre that absorbs oil - much like sponges and water.
I think this because it’s the same reason hair becomes greasy - it’s great at absorbing oils. In fact there was a campaign to donate hair to some charity or something to help mass oil spills in the ocean. It’s pr... | [
"BULLET::::- Oil Print Process: Made by applying greasy inks to paper coated with a solution of gum bichromate and gelatin. When exposed through a negative, the gum-gelatin hardens where light strikes it while unexposed areas remain soft. Artist's inks are then applied by brush, and the inks adhere only to the hard... |
Can you willingly hold your breath till you die? | No, unconsciousness would set in, and it is a bit hard to hold one's breath while unconscious
. | [
"It is impossible for someone to commit suicide by simply holding their breath, as the level of oxygen in the blood becomes too low, the brain sends an involuntary reflex, and the person breathes in as the respiratory muscles contract. Even if one is able to overcome this response to the point of becoming unconscio... |
what's the difference between using o negative blood and type-specific blood in emergency medicine? | On the positive: any O- blood, with a few less common exceptions, can be transfused into any patient without issue. In an emergency situation where an immediate transfusion is critical, waiting a few minutes to test a patient's blood may do harm to the patient.
On the negative: O- blood is rare, as donors of that ty... | [
"Because blood type O negative is compatible with anyone, it is often overused and in short supply. According to the American Association of Blood Banks, the use of this blood should be restricted to persons with O negative blood, as nothing else is compatible with them, and women who might be pregnant and for whom... |
why do people’s voices change when they are advertising a product? | You're being paid to present specific information as clearly as possible.
So, you tend to go out of your way to enunciate everything clearly, and cover up your accent or regional dialect.
You can get a similar effect yourself. Try reading a news article to a group of people, it's the same thing. You'll find yoursel... | [
"One of the most common uses for voice acting is within commercial advertising. The voice actor is hired to voice a message associated with the advertisement. This has different subgenres; television, radio, cinema, and web-advertising. The subgenres are all different styles in their own right. For example, televis... |
why do so many teachers demonize wikipedia? | It's not that they dislike wikipedia, it's that Wikipedia (and all encyclopedias) are frequently used improperly by lazy students. Encyclopedias are not primary sources and as such should not be used as references on papers.
A lazy student trick I developed was to cite the encyclopedia's sources rather than the enc... | [
"Critics have stated that Wikipedia exhibits systemic bias. In 2010, columnist and journalist Edwin Black criticized Wikipedia for being a mixture of \"truth, half truth, and some falsehoods\". Articles in \"The Chronicle of Higher Education\" and \"The Journal of Academic Librarianship\" have criticized Wikipedia'... |
how are calories burned while walking? | Calories are burnt to fuel muscle cells to contract in order to move the limbs. The heart is not burning many of the calories itself, but the beat rate is indicative of the amount of energy being expended. The blood carries the oxygen necessary to liberate the energy. More energy requires more oxygen so the heart rate ... | [
"Diet itself helps to increase calorie burning by boosting metabolism, a process further enhanced while gaining more lean muscle. An aerobic exercise program can burn fat and increase the metabolic rate.\n",
"Although a 15-minute walk after dinner is a must to lead a healthy life, it plays a key role in weight lo... |
what factors are involved that decide *when* the penis ejaculates | I think there's a "trigger" when you reach a certain level of penile stimulation. This "trigger" helps establish a physical difference between "I'm having sex and trying to orgasm" and "someone accidentally brushed against me on the train". Life would be a little more difficult if the latter made you orgasm frequently.... | [
"The number of sperm in any given ejaculate varies from one ejaculate to another. This variation is hypothesised to be a male's attempt to eliminate, if not reduce, his sperm competition. A male will alter the number of sperm he inseminates into a female according to his perceived level of sperm competition, insemi... |
Do scientists testing medicine on animals have to give the animals the disease first? | This really depends on the study. Many studies just test the effects of the drug on healthy animals. Often the disease cannot be vectored in the animal, as it the case with some viruses, so you cannot give it to the animal. However, most of the time you are able to introduce or induce the exact or similar human disease... | [
"Animal testing for veterinary studies accounts for around five percent of research using animals. Treatments to each of the following animal diseases have been derived from animal studies: rabies, anthrax, glanders, Feline immunodeficiency virus (FIV), tuberculosis, Texas cattle fever, Classical swine fever (hog c... |
Was there a star in the Suns place before the Sun actually formed? | Nope. Stars are not like sequoia trees. When the main tree dies, new ones grow up from the roots. It's not the same thing. Star creation comes from gaseous clouds like in Orion nebulae, in most cases where matter is compressed enough by surrounding shock waves to begin to condense, and get and more and more mass with l... | [
"The Sun formed about 4.6 billion years ago from the collapse of part of a giant molecular cloud that consisted mostly of hydrogen and helium and that probably gave birth to many other stars. This age is estimated using computer models of stellar evolution and through nucleocosmochronology. The result is consistent... |
why do birds who are fully capable of flight choose to cross the street on foot? assuming they aren't with their babies. | No expert here, but flying costs infinitely more energy than walking. What I'm wondering is why when I'm on the bike and a pidgeon is on my left hand side it choses to run from my threat not by walking to the left, but to pass in front of me and go to the right.. | [
"Additionally, it has been noted that during migration the birds may fly closer to the ground than normal; possibly foraging for insects. There is speculation that feeding also occurs at higher altitudes.\n",
"Keeping birds who through natural adaptation or selective breeding have lost the ability to fly removes ... |
How do wings on commercial airliners not break from stress due to weight and thrust? | Plane wings aren't designed to be rigid, and that's not a requirement for reliability. There are plenty of materials which can flex to a certain degree infinitely, or if not, to a predictable load-cycle lifetime.
Why do all of these things work and not break? Aircraft engineers know really well how the materials they... | [
"The lift from wings is proportional to their area, so the heavier the animal or aircraft the bigger that area must be. The area is the product of the span times the width (mean chord) of the wing, so either a long, narrow wing or a shorter, broader wing will support the same mass. For efficient steady flight, the ... |
why can people walk up stairs without looking at their feet once, but then become alarmed going up stairs with their eyes closed? | Walk up the stairs right now and tell me again that you don't see your feet while looking up the stairs, your peripherals keep you feeling safe, you close your eyes and lose all sense of awareness | [
"It is estimated that a noticeable mis-step occurs once in 7,398 uses and a minor accident on a flight of stairs occurs once in 63,000 uses. Stairs can be a hazardous obstacle for some, so some people choose to live in residences without stairs so that they are protected from injury.\n",
"The broken escalator phe... |
how do lint filters work/trap lint? | You don't need holes that are the same size as the particles you're collecting, in order to collect those particles (in this case, lint fibers). Look at any dusty oscillating fan.
Hot air and plastic create static electricity. Those fibers, floating around on hot wind, get attracted to the plastic of the filter and ha... | [
"Over time, a thin layer of filter cake (called \"muck\") accumulates on the lint filter. The muck is removed regularly (commonly once per day) and then processed to recover solvent trapped in the muck. Many machines use \"spin disk filters\", which remove the muck from the filter by centrifugal force while it is b... |
what would happen if a person tried to live in pripyat or any irradiated area ? | Radiation causes DNA to mutate. If DNA mutates in certain ways, this can develop into cancers. Living in these areas increases likelihood of developing cancer.
EDIT: this is assuming there's only minor radiation in the area. With high levels of radiation, cells begin to die, leading to organ failure. | [
"There were 270,000 inhabitants of the area. Mass evacuation was carried out as the critical contamination resulted from Sr-90 with a half-life of 28.8 years. About 800 km² of land were taken out of use, and 82% of this area has now been taken into use again for forestry and farming. However, evacuation was limited... |
Were pre-Enlightenment European monarchs really that pious or did they use religion primarily as a means of control? | Annales historian Lucien Febvre showed in his work *The Problem of Unbelief in the Sixteenth Century: The Religion of Rabelais* that atheïsm was basically unthinkable before the enlightenment. This meant that even for critical thinkers like Rabelais is wasn't possible to be an atheïst, the notion simply didn't exist in... | [
"A prominent example of a monarch who took the Enlightenment project seriously was Joseph II of Austria, who ruled from 1780 to 1790 and implemented a wide array of radical reforms, such as the complete abolition of serfdom, the imposition of equal taxation policies between the aristocracy and the peasantry, the in... |
what is happening inside our body when we feel different emotions? | A lot of chemicals. Your brain makes certain chemicals depending on how you feel. How you feel is depending on what's going on in your brain. So sad memories or seeing someone you love causes the brain to make sad or happy chemicals. These change how other parts of your brain will react. They affect the connections bet... | [
"Emotions, as defined by Damasio, are changes in both body and brain states in response to different stimuli. Physiological changes (e.g., muscle tone, heart rate, endocrine release, posture, facial expression, etc.) occur in the body and are relayed to the brain where they are transformed into an emotion that tell... |
do the different types of shampoos actually have any difference? i see 'anti-hairfall', 'strengthening' and a whole other bunch of flavours. | They do in many cases. But the effect that you get out of those shampoos can vary quite a bit from what you see on the advertisements with the gorgeous models flipping their massive long hair all over the place and blinding the cameramen and stuff.
Some are legitimate. Anti-dandruff shampoos usually contain chemicals ... | [
"One reason is concern about the effect of ingredients typically found in commercial hair care products. Shampoo typically contains chemical additives such as sodium lauryl sulfate and sodium laureth sulfate, which can irritate sensitive skin or if not thoroughly rinsed. Such chemical additives are also believed by... |
how can rockstars like keith richards and ozzy osbourne do so many hard drugs and consume so much alcohol over their lifetimes, yet still live into old age? | You have picked two people who are MASSIVE statistical outliers. Even science is fairly confused by their survival. I believe they were studying Mr. Richards to understand how he's still breathing. | [
"The average age of onset of alcohol abuse was 29 years for the Core City men and 41 years for the College men. Full blown alcoholism, where it appeared, usually lasted a decade or two before sobriety was attained. The number of alcoholics increased steadily until age 40 and then began to decline at a rate of stabl... |
all the stages of starvation up to death. | The first stage would be the conversion of any stored glycogen (form of stored excess glucose) into glucose. The second stage would be the breaking down of any stored fats in your body to provide for energy. The third and final stage would be the rapid muscle wasting once you do not have any fats left for breaking down... | [
"Starvation is a severe deficiency in caloric energy intake, below the level needed to maintain an organism's life. It is the most extreme form of malnutrition. In humans, prolonged starvation can cause permanent organ damage and eventually, death. The term inanition refers to the symptoms and effects of starvation... |
when rubbing alcohol or hydrogen peroxide are applied to an open wound; what is it in the liquids that makes/creates a burning sensation? | The alcohol and hydrogen peroxide, that's what burns, the only other thing in those solutions is water. They burn because they cause cells to die and trigger your nerves. | [
"Once in contact with an exuding wound, an ion-exchange reaction takes place between the calcium ions in the dressing and sodium ions in serum or wound fluid. When a significant proportion of the calcium ions on the fibre have been replaced by sodium, the fibre swells and partially dissolves forming a gel-like mass... |
why babies don't even have a bad breath even not using a mouthwash or something? | _URL_0_
I guess most people have completely normal breath.
Edit: There are studies who say up to 60% of the population has bad breath. Mostly (90%) because of bad teeth - babies don't have teeth.
_URL_1_ | [
"Shampoo for infants and young children is formulated so that it is less irritating and usually less prone to produce a stinging or burning sensation if it were to get into the eyes. For example, Johnson & Johnson advertises Johnson's baby Shampoo under the premise of \"No More Tears\". This is accomplished by one ... |
Lou Gehrig's Disease (A.L.S.)? | Since "working" usually just means "results in better outcomes than the next best treatment often enough that it's hopefully not just luck", it's not an easy thing to settle. Clinical trials need to be replicated, especially as different hospitals/countries use different "next best" treatments. Sometimes the trials are... | [
"Daniel Jeffrey Wallace (born October 27, 1949) is an American rheumatologist, clinical professor, author, and fellow. Wallace has published 400 peer reviewed publications, 8 textbooks, and 25 book chapters on topics such as Lupus, Sjogren syndrome, osteoarthritis, and fibromyalgia. He has the largest cohort of lup... |
what do cooking show hosts do with the food they prepare once the recording is finished, if they're not cooking for a live audience (giada at home, for example)? | it usually goes to the crew for lunch | [
"Hosted by Greg Komorowski, each episode of the series features a competition between two professional chefs who must \"compete without cooking\", by providing remote direction to an absolutely clueless cook. Using only a video monitor to watch the amateur's actions and a microphone to communicate direction into an... |
what is a high deductible health insurance plan, and is it good or bad to have one? | Basically the deductible is the amount for healthcare expenses you are expected to pay out of pocket in any given year before insurance will pay anything..
(Of course, insurance negotiated rates will still be provided and some services may be covered regardless of the deductible status ).
A high deductible plan is o... | [
"The premium for a high-deductible health plan is generally less than the premium for traditional health insurance. A higher deductible lowers the premium because the insurance company no longer pays for routine healthcare, and insurance underwriters believe that Americans who see a relationship between medical cos... |
Why would they make the Statue of Liberty out of copper if they knew it would turn green? | there is few reasons.
1. copper was much cheaper than precious metals (like gold or silver) and cheaper than stainless steel.
2. after copper turns green (creating of copper oxide) it's resistant to oxidation - it can last for centuries without much maintenance. steel must bo painted fairly often (like eiffle tower -... | [
"According to some sources, the copper for the skin of the Statue of Liberty was mined and refined in Nizhny Tagil. However, research by Bell Laboratories in New Jersey, USA, suggests that the Visnes mine in Norway is the most likely source.\n",
"There have been questions raised about how the statue would hold up... |
How were the crusades organised on a practical level? | This isn't exactly a question that can be answered in the way I think you're hoping, but I hope I can provide some insight.
Messages were sent just as you would think - via letter or a messenger himself - so they did indeed take a while to organize. From the time of the proclamation of the crusade, participants had ... | [
"The Crusades were a series of religious wars sanctioned by the Latin Church in the medieval period, especially the campaigns in the Eastern Mediterranean aimed at recovering the Holy Land from Islamic rule.\n",
"The 14th century saw some other crusades organized, but these enterprises differed in many ways from ... |
why do musicians/djs wear headphones on one ear? does it actually do anything to help them? | The headphone is going to be playing them an immediate feed of what they're doing with their equipment, and the free ear so that they can compare that to what the audience is hearing as it's coming out of the speakers. It lets them adjust anything they need to as they play so that the audience can get the best sound an... | [
"DJs generally use higher quality headphones than those designed for music consumers. DJ headphones have other properties useful for DJs, such as designs that acoustically isolate the sounds of the headphones from the outside environment (hard shell headphones), flexible headbands and pivot joints to allow DJs to l... |
How did Elvis Presley come to be associated with tacky/trashy culture? | Firstly, I should point out that in the world of rock'n'roll criticism, etc, Elvis isn't necessarily always seen as tacky/trashy: there are 11 Elvis songs in Rolling Stone's list of the 500 Greatest Songs (including 'Hound Dog' at #19, 'Heartbreak Hotel' at #45, 'Jailhouse Rock' at #67, 'Mystery Train' at #77, and 'Sus... | [
"In his scholarly work \"Race, Rock, and Elvis\", Tennessee State University professor Michael T. Bertrand examined the relationship between popular culture and social change in America and these allegations against Presley. Professor Bertrand postulated that Presley's rock and roll music brought an unprecedented a... |
the tiger woods thing that happened today? | Tiger hit his ball into a water hazard. When this happens you take a one stroke penalty and you can either drop a ball where you originally played the shot or any distance behind the point where the ball entered the hazard (in line with the angle it entered). In some cases there may also be a designated 'drop zone' w... | [
"Woods retired from his second career in 1988. He traveled to Tiger's events as often as possible for the rest of his life. Woods hired Connecticut attorney John Merchant in 1996 to help facilitate the path for Tiger to turn professional, and to secure lucrative sponsorship agreements when he did so. Merchant had b... |
why are green grapes and apples more tart than their red counterparts? | As certain fruits get ripe, the malic acid in them decreases, causing unripe (green) fruits such as apples and grapes to be high on malic acid, making them more sour. | [
"Based on that research, bicolored apples proved to be more popular than monocolored ones. However, there was shown to be no difference in preference between apples that are red and green or red and yellow. For example, a combination of red and yellow was associated with such terms as sweetness, freshness, juicines... |
American History - Where to start? | I'd recommend looking at the books that are part of the [Oxford History of the United States](_URL_0_). The authors are some of the leaders in the fields they are writing on and the books are engaging, accessible, but also academically rigorous. | [
"The history of the United States from 1865 until 1918 covers the Reconstruction Era, the Gilded Age, and the Progressive Era, and includes the rise of industrialization and the resulting surge of immigration in the United States. This article focuses on political, economic, and diplomatic history.\n",
"In 1865 s... |
Askscience, I have a weird question. What is the nutritional value of an average human male? | Asked before, believe it or not!
_URL_0_ | [
"A human male weighing 68 kg (150 lb) normally synthesizes about 1 gram (1,000 mg) of cholesterol per day, and his body contains about 35 g, mostly contained within the cell membranes. Typical daily cholesterol dietary intake for a man in the United States is 307 mg.\n",
"Regarding metabolism (MR) in the formula;... |
What makes cold food bad for you? | As long as the food was cooked properly to a sufficient internal temperature (depends on the food) for a sufficient time, and chilled promptly rather than laying around on the counter all night, there's nothing wrong with eating cold food except personal preference. Personally, I quite like cold fried chicken. Reheat... | [
"Some Turks believe that cold foods, such as ice cream, will cause illnesses – such as sore throats and the common cold; it is held that consumption of warm liquid while consuming ice cream will counteract these effects.\n",
"Foods that spoil easily, such as meats, dairy, and seafood, must be prepared a certain w... |
Do Brita (or similar) water filters eliminate or minimize electrolytes? | Be wise to claims that electrolytes "help your body hydrate better". Especially when printed on bottles that contain ... electrolytes! Because if *you* wanted to make money selling *water*, wouldn't you tell people something at least not-legally-false to get them to buy your water?
Anyhow, the types of water filters y... | [
"New water-based electrolytes were developed in Japan from the mid-1980s with the goal of reducing ESR for inexpensive non-solid electrolytic capacitors. Water is inexpensive, an effective solvent for electrolytes, and significantly improves the conductivity of the electrolyte.\n",
"Because of its high relative d... |
What causes a specific area of land to become a desert? | Deserts are usually formed by the rain shadow effect or the Coriolis effect. Rain shadows occur when clouds rich in water approach mountain ranges, where the clouds are forced upwards, allowing the water to cool. Cool water has more of a tendancy to be expelled from clouds, so it releases all the vapor in the form of r... | [
"Desertification is a type of land degradation in which a relatively dry area of land becomes a desert, typically losing its bodies of water as well as vegetation and wildlife. It is caused by a variety of factors, such as through climate change (particularly the current global warming) and through the overexploita... |
why don't people punch with both hands at once? | A lot of the power of a properly thrown punch comes from the hips and legs as you turn your body into the punch. By throwing both fists at once you only get the power of the arms in the punch. | [
"BULLET::::- People of opposite sex do not usually shake hands when they greet each other but a change in this rule is being seen everywhere and friends of the opposite gender may shake hands on seeing each other. It is frequent among men to put their right hand on their chest (heart) after shaking hands but friend... |
What is the earliest datable event? | For clarification, what evidence would be needed to suppport the claimed date? I can only think of astronomy-related events for a pin-point date like Mursili's Eclipse (24 June 1312 BC)
Edit: Plugging in an earlier AskHistorian's thread similar to this question but with year.
_URL_0_ | [
"The last events in Chronicles take place in the reign of Cyrus the Great, the Persian king who conquered Babylon in 539 BC; this sets an earliest possible date for the book. It was probably composed between 400–250 BC, with the period 350–300 BC the most likely. The latest person mentioned in Chronicles is Anani, ... |
how can pulling the plug on a computer potentially corrupt software/files in the computer? | It's not pulling the plug that corrupts a computer, it's the fact the computer might be in the middle of reading a file then writing over it.
If a power source is removed whilst the writing is going ahead, the sudden stop would cause the writing to be incomplete and the computer wouldn't know where to begin once powe... | [
"On the opposite case, a software cracker may hard-code a valid serial number to the program or even prevent the executable from asking the user for it, allowing unauthorized copies to be redistributed without the need of entering a valid number, thus sharing the same key for every copy, if one has been hard-coded.... |
The fastest car in 1938 had a land speed record of 432km/h. How did they record its speed? | FYI that's a Mercedes Benz W125 Rekordwagen. It held the record until this very year, 2017, when Koenigsegg's Agera RS broke it. | [
"He is known for setting the first recognised automobile land speed record on December 18, 1898, in Achères, Yvelines, using a Jeantaud electric car. The record was set as part of a competition organised by the French automobile magazine \"La France Automobile\". He completed a single flying run in 57 seconds to gi... |
what is the evolutionary reason behind getting endorphin after excercise? | The same system that trips endorphins when you're injured- strenuous exercise is acutely damaging and painful to boot. Pain serves a purpose, but can be a hindrance beyond initial notification of injury, so your body has a way of turning it down.
Long tattoo sessions start to feel like long runs, for the same reason.... | [
"Endorphins (contracted from \"endogenous morphine\") are endogenous opioid neuropeptides and peptide hormones in humans and other animals. They are produced by the central nervous system and the pituitary gland. The term \"endorphins\" implies a pharmacological activity (analogous to the activity of the corticoste... |
does food sit normally in your stomach in space? | So, the problem is, if everything is falling together, how can food 'fall' through the digestive system?
The simple answer is that it dosen't! It dosen't in space and it dosen't on earth either. The food in your mouth is pushed to the stomach by muscles in the lining of the tube between mouth and your stomach. Then, i... | [
"The stomach bed refers to the structures upon which the stomach rests in mammals. These include the pancreas, spleen, left kidney, left suprarenal gland, transverse colon and its mesocolon, and the diaphragm. The term was introduced around 1896 by Philip Polson of the Catholic University School of Medicine, Dublin... |
how do people afford to survive once they're unemployed? | Savings, unemployment benefits, helps from friends and family, selling stuff, borrowing and credit cards, and finally, just not paying bills until stuff gets shut off and you get evicted. | [
"Job insecurity is widespread in the informal sector, and individuals can quickly become unemployed. The casual sector employment attracts low wages, and the workers can barely make any savings to improve their economic situation. Informal sector employment does not have insurance and pension benefits, thus worseni... |
what would happen if all the world's economies defaulted/went bankrupt? and/or why can't governments just print more money when they are in massive debt? | > What would happen if all the world's economies defaulted/went bankrupt?
No one can really answer this other than total world wide anarchy
> Why can't governments just print more money when they are in massive debt?
This causes inflation, the currency of that country looses values vs. other currencies. | [
"BULLET::::- It is not only individual persons and businesses that go bankrupt as a consequence of the fact that there is more debt than money in circulation. Many states have gone bankrupt and some states have done so many times. The debt problem is particularly severe for developing countries that have debt in fo... |
does the president or other heads of state have to clear customs the same way normal people do when visiting a country? | No, as high-ranking officials of another government, they're covered by special diplomatic rules that allow them to dispense with that sort of stuff. | [
"All foreign heads of state and heads of government are presented officially to Congress in the same manner as the president during the State of the Union Address and are introduced by the speaker by their diplomatic style of address, followed by their name and respective office.\n",
"The visiting head of state i... |
- what makes html5 so special ? | Its not so much HTML5 that makes things so special but enhancements to the JavaScript and CSS3 supporting HTML5.
HTML5 adds more tags making things like navigation bars, side links and content much easier to accomplish. Instead of typing < div id="nav" > you can now just type < nav > and control the appearance be... | [
"HTML 5 was first released in public-facing form on 22 January 2008, with a major update and \"W3C Recommendation\" status in October 2014. Its goals were to improve the language with support for the latest multimedia and other new features; to keep the language both easily readable by humans and consistently under... |
why does looking at grotesque images or videos of people’s body detached or missing make me feel extremely uneasy | It's a normal psychological response, to be disturbed, disgusted, and afraid when you see images of blood and gore.
For one thing, humans are highly empathetic, so when we such things happening to other people, we can easily imagine what it would be like if they were happening to ourselves, which is terrifying obvious... | [
"Generally, faces tend to appear distorted to a person who is affected by this condition. Those who suffer from this condition are able to recognise faces normally but perceive them as strangely disfigured. These facial hallucinations are usually described as ugly, and have prominent eyes and teeth. Some have descr... |
what's different about usbs and/or os now that makes data corruption from pulling usbs out less likely? | Used to the system would wait to write the files, now the computer writes it as soon as it can. Its like if I gave you a series of numbers to remember, and told you you had to wait 5 minutes to write them down versus writing them down right away. | [
"BULLET::::- Live USBs provide the additional benefit of enhanced privacy because users can easily carry the USB device with them or store it in a secure location (e.g. a safe), reducing the opportunities for others to access their data. On the other hand, a USB device is easily lost or stolen, so data encryption a... |
Does light travel at c through space? | There are two broad domains in physics where we talk about "light" "traveling." There's introductory physics, where we simply don't want to introduce subtlety yet, and then there's advanced physics, where we all know the details and don't care to rehash them every day.
In between, there's the truth: It's rather mislea... | [
"According to the equivalence principle of general relativity, the rules of special relativity are \"locally\" valid in small regions of spacetime that are approximately flat. In particular, light always travels locally at the speed \"c\"; in our diagram, this means, according to the convention of constructing spac... |
why will we have a cure for leukemia available next year but other cancers are years away? | Because the vast majority of proposed treatments turn out to not work or to have terrible side effects. Scientists and researchers have been known to fake results for profit or other reasons and so the process needs to be rigorous. Otherwise, you can wind up with [worse than what you're treating for...](_URL_0_) | [
"Chemotherapy does not always work, and even when it is useful, it may not completely destroy the cancer. People frequently fail to understand its limitations. In one study of people who had been newly diagnosed with incurable, stage 4 cancer, more than two-thirds of people with lung cancer and more than four-fifth... |
the trillion dollar coin and what it means. | Basically thanks to section k of [this law](_URL_0_) the Secretary of the Treasury can mint a coin in whatever denomination he would like as long as its made of platinum.
This is relevant because what Tim Geithner (our current Secretary of the Treasury) could do is mint a 1 trillion dollar platinum coin (note this coi... | [
"The trillion dollar coin is a concept that emerged during the United States debt-ceiling crisis in 2011, as a proposed way to bypass any necessity for the United States Congress to raise the country's borrowing limit, through the minting of very high-value platinum coins. The concept gained more mainstream attenti... |
why are americans annoyed about the superbowl 1/2 time show? and why is it about spongebob? | Stephen Hillenberg, the creator of Spongebob, passed away last year. In the show, there’s an episode where they perform the song Sweet Victory at the Super Bowl, and it’s considered one of the best moments of the show. There was a social media movement/meme thingy to have Sweet Victory played during halftime at the 201... | [
"Because the Super Bowl is on a Sunday, before the mid-2000s, networks never carried a new episode of their weeknight late night talk shows after the game, lead-out program and local news. However this has changed since then, usually after the late local news, in order to give those programs an additional promotion... |
Why does white-hot metal look white when it's cooler than the surface of the sun? | [Take a look at the exact form of blackbody curves for different temperatures](_URL_0_). You can see that, even though the peak emissions for lower temperatures are in the infrared, there is a significant amount of visible wavelengths being emitted as well by a 2000K object. Lower temperatures ( < 1000K) have almost no... | [
"In the presence of sunlight the surface temperature of an object is usually considerably higher than the temperature of the air. Solar absorptivity is closely related to color, varying from about 20% for white materials to 90% for black materials; thus samples of different colors will reach different on-exposure t... |
How do we know gravity is constant? | There are certainly models in which gravity behaves differently than we think (my own research focuses on these sorts of modified gravity theories). Some of those theories are built to try to alleviate the need for dark matter. They tend to face two problems. One, they tend not to fit the data so well unless you have s... | [
"The gravitational constant (also known as the \"universal gravitational constant\", the \"Newtonian constant of gravitation\", or the \"Cavendish gravitational constant\"), denoted by the letter , is an empirical physical constant involved in the calculation of gravitational effects in Sir Isaac Newton's law of un... |
Why do elements react? | Honestly this is a very big question. But I'll give it shot...
tl;dr: blame the electrons
reactions of elements are highly driven by the makeup of the electron shells. Electron shells result because electrons are all negatively charged and have to share space around the positively charged core. think of electron shel... | [
"The second meaning of 'reactivity', that of whether or not a substance reacts, can be rationalised at the atomic and molecular level using older and simpler valence bond theory and also atomic and molecular orbital theory. Thermodynamically, a chemical reaction occurs because the products (taken as a group) are at... |
Why did Jefferson believe in an Agricultural future for the US? | If I were wearing my lawyer's hat I would object to the form of the question, which assumes matters not in evidence. Jefferson had a widely shared vision of a future America, where the majority of the population would live west of the Alleghenies in more or less self-sufficient communities. At a famous dinner Alexander... | [
"Jeffersonian agrarians held that the economy of the United States should rely more on agriculture for strategic commodities than on industry. Jefferson specifically believed: \"Those who labor in the earth are the chosen people of God, if He ever had a chosen people, whose breast He has made His peculiar deposit f... |
Where on the evolutionary tree did felines diverge from other mammals and develop vertical slit pupils? | Slit pupils can be found in most groups of terrestrial vertebrates, from amphibians to primates. If you look within a family you generally find that the smaller animals have slit pupils and the larger round pupils. For example domestic cats and lions, foxes and wolves, slow loris and gorillas.
The reason for a slit pu... | [
"Much of the morphological evidence to support the hypothesis of diphyly has been based on the structure of the inner ear. Most morphological studies have concluded that convergent evolution is the mechanism that resulted in today’s two genera of tree sloths. This means that the extant genera evolved analogous trai... |
In using directions in interstellar space, how are locations of objects tracked? | There are a variety of reference frames commonly used in space, they differ in their choice of the point used as origin, the fundamental plane and the directions for the axes. You also have cartesian or spherical coordinate systems, and rotating or non-rotating reference frames. See [this thread](_URL_1_) for details. ... | [
"Other range-finding applications involve two-way transmissions. A local station generates a pseudorandom bit sequence and transmits it to the remote location (using any modulation technique). Some object at the remote location echoes this PN signal back to the location station – either passively, as in some kinds ... |
Why did Mark Antony hate Cicero enough to have him assassinated? | Cicero was not assassinated, he was proscribed. The one was illegal and could result in prosecution for murder, the other technically legal, if abhorrent to decent Roman sensibilities. Shortly before Philippi the triumvirs enacted a series of proscriptions, in which Cicero was outlawed and executed. Plutarch believes t... | [
"Cicero's attacks on Antony were neither forgiven nor forgotten, with the result that Cicero was proscribed and killed in 43 BC. His head and hands were publicly displayed in the Roman Forum to discourage any who would oppose the new Triumvirate of Octavian, Mark Antony and Lepidus.\n",
"Cicero became a popular l... |
Why do men wear pants? | _URL_2_
> pants owe their several thousand years of worldwide fashionableness to horses — or, more precisely, to the extreme awkwardness of riding a horse in a robe.
_URL_0_
> Trousers first enter recorded history in the 6th century BCE, with the appearance of horse-riding Iranian peoples in Greek ethnography
... | [
"Pantsuits were often deprecated as inappropriately masculine clothing for women. For example, until 1993, women were not permitted to wear pantsuits (or pants of any kind) on the United States Senate floor. In 1993, Senators Barbara Mikulski and Carol Moseley Braun wore pants onto the floor in defiance of the rule... |
why do snail trails just start in random places? | The trail slowly dries and becomes less viable. Enough time has passed for parts of the trail to disappear, giving the appearance that it just started in a random place | [
"This snail favors sheltered positions and in exposed areas seeks the shelter of crevices or dense patches of seaweed. In unsuitable conditions, such as at times of food shortage or when there are excessive numbers of predators, it can produce a string of mucus which it uses as a \"parachute\" to help it to drift t... |
how do government/military teams and operations get named? | I believe its just a random named picked by the person in charge. They usually make sense or are some sort of pun on operation.
"Desert Storm" was a military operation in a desert releasing a veritable storm of firepower.
"Desert Shield" was the deployment of forces to a desert to shield one country from another
an... | [
"The second is a by-product of the U.S. Army's procedure for forming task-organised forces for combat, differing from strictly doctrinally assigned table of organization and equipment organizations. A battalion, company or brigade commander has very wide latitude in selecting a task force name, though often the nam... |
Best "meta"-history books, i.e. books about the writing of history, methodology, philosophy of history, the moral/political dimensions of history writing, etc. | These books come to mind, just pick those that seem interesting to you:
* *That Noble Dream* by Peter Novick
* *Objectivity is not Neutrality* by Peter Haskell
* *The Historian's Craft* by Marc Bloch
* *In Defence of History* (Evans)
* *Historian's Fallacie: Toward a Logic of Historical Thought* (Fischer)
* *What is H... | [
"The work presents the early history of the genre via a discussion of the lives and works of eighteen of its most important formative authors, followed by a more general discussion of more recent writers.\n",
"It examines the relationship between the form of the historical novel on the one hand and the formal stu... |
what stops a jury from thinking "well he is invoking his 5th amendment right, he must be guilty" and then saying he thinks the defendant is guilty? | **tl;dr:** A jury will never hear anyone invoke the 5th amendment in relation to a crime that they are currently on trial for.
Your question is based on a (very common) misunderstanding of how invoking your 5th amendment right works. If you're on trial for a crime, you never have to take the stand to testify. Doing... | [
"In the U.S., every defendant in a criminal case has the right, under Article III, Section 2 and the Sixth Amendment to the U.S. Constitution, to be tried by an impartial jury. If the defendant is acquitted, the Double Jeopardy Clause of the Fifth Amendment forbids the government from putting him or her on trial ag... |
I'm looking to build a historically accurate "Viking" round shield - what were real Viking shields like? | [Hurstwic](_URL_0_) are your go-to guys for reconstrcting Viking paraphenalia. | [
"The Yetholm-type shield is a distinctive type of shield dating from 1200-800 BC (Bronze Age). The known shields come from Britain and Ireland, excepting one from Denmark. Their modern name comes from Yetholm in southern Scotland where a peat bog yielded three examples. Twenty two examples are known, although some ... |
why do american political parties spread out state primary voting over a 4 month period? doesn't this process create more discord and factionalism within a party as opposed to fitting all the states in one month. | That the election process is a marathon and not a sprint is certainly tiresome to most, but the ability of a candidate to maintain and sustain a long political campaign is part of the vetting process. We the electorate see the candidate repeatedly face challenges, defeats have victories. It requires strategy, diploma... | [
"While many states hold primary elections, relatively few states hold statewide, multilevel caucuses. Party leaders and state officials believed that switching from a primary election to a caucus would streamline Nevada's move to becoming an early contender in the nomination process. As a result of switching from a... |
if distant galaxies are moving away faster than those close to us, will we ever reach them? | The furthest identified galaxy, GN-z11, is ~13.4 billion light years away. Due to the current expansion of the universe, if you left today traveling at the speed of light you would arrive in about 32 billion yers.
It is very unlikely we will ever reach them barring some presently purely hypothetical method of transpor... | [
"Due to the distances involved, any serious attempt to travel between galaxies would require methods of propulsion far beyond what is currently thought possible in order to bring a large craft close to the speed of light.\n",
"In models of the expanding universe, the farther galaxies are from each other, the fast... |
what will be the fate of rich arab and gulf countries when their oil reserves will become almost empty? | It's hard to know for sure, but a lot of them have thought about this problem. The key is diversification, and you accomplish that by investing in other sectors. Saudi has car manufacturing for example, some of the smaller places are tourist or financial hubs or whatever. The problem with trying to diversify is t... | [
"At current rates of production, the oil reserves in the Middle East are expected to be depleted in 85 years. Once the reserves in the U.S., China, and India are depleted, these countries will have to rely much more heavily on oil importation, putting more pressure on oil exporting areas of the world, and thus drai... |
If you lose your sense of smell/taste, does it effect your ability to pick up on pheromones? | Do humans really even respond to pheromones to any significant degree at this point of evolution? | [
"A physician can determine if the problem is with the sense of smell (olfactory system) or taste (gustatory system), or if it is caused by a neurological or psychiatric disorder. Phantosmia usually goes away on its own, though this can sometimes be gradual and occur over several years. When caused by an illness (e.... |
the difference between a television or a monitor | a television is a specialized screen to watching programming delivered through cable or a set top box. a monitor is a specialized screen to deliver content delivered through a computer's video card.
realistically, the two can be used interchangeably provided the connectors are available. | [
" A monitor displays information in visual form, using text and graphics. The portion of the monitor that displays the information is called the screen. Like a television screen, a computer screen can show still or moving pictures and It’s a part of Output Devices.\n",
"A computer monitor is an output device that... |
british political parties, who are the tories? what do the stand for? are the the same as labour? what do the conservatives want?! | In the modern day the Tories are the Conservatives. The Conservative & Unionist Party is their full current name and they are the current Government in both the Lords and the Commons, the Government in the Lords isn't important. They are also the Second Party in Y Senedd (Welsh Parliament) and Scots Parlaiment.
... | [
"The Conservative Party, officially the Conservative and Unionist Party, sometimes informally called the Tories, is a political party in the United Kingdom. The governing party since 2010, it is the largest in the House of Commons, with 312 Members of Parliament, and also has 249 members of the House of Lords, 4 me... |
What can be learned about a person’s abilities from a brain MRI scan? | Little to nothing.
If someone has severe brain damage, as from a stroke or an injury or some similar thing, you can see that on MRI. Dead tissue looks different than live tissue.
But imaging cannot tell you about a person's abilities. There is no way to look at an MRI and say whether the patient is smart, or musica... | [
"Magnetic resonance imaging (MRI) is performed in people with PTE, and CT scanning can be used to detect brain lesions if MRI is unavailable. However, it is frequently not possible to detect the epileptic focus using neuroimaging.\n",
"CT and MRI are most commonly used to observe the brain for cerebral atrophy. A... |
why aren't kids from all over the world held to the same general testing before university? | Because different countries have very different standards and tests internally. I know my own didn't even use to have a national exam until fairly recently and every University used to just hold their own tests. Plus, how would one even create such a test, offer it, apply it and what would your grade actually be worth?... | [
"Originally, these tests were intended to decide which school would be best suited to a child's needs – officially there was no \"pass\" or \"fail\" – the result determined which of the three tiers of schools the child went to. However, because of the lack of technical schools, the Eleven-Plus came to be seen as a ... |
Is it physically possible for a telescope to be good enough that we could see individual life forms on a planet in another solar system? | You would need a 6 km diameter mirror just to see the Apollo ascent stages left on the Moon. To see a continent the size of the US on the nearest exoplanet would require a mirror 1.7 million km in diameter.
edit: Scratch that, it should be 1.7 million cm, which is only 17 km.
This might be something useful to do with... | [
"It has been estimated that a telescope with a diameter of 80 meters would be able to spectroscopically analyse Earth-size planets around the forty nearest sun-like stars. As such, this telescope could help in the exploration of exoplanets and extraterrestrial life (because the spectrum from the planets could revea... |
What was the Byzantine reaction to the crowning of Charlemagne as Holy Roman Emperor? | I think the important thing to look at is the context of Franco-Byzantine relations in the 8th and early 9th centuries. Throughout the period, from 754 onwards the Byzantines and Franks had been vying for control over Italy. In 756 after the Franks, led by Pippin III, had defeated the Lombard kingdom messengers from th... | [
"The coronation of Charlemagne as emperor on Christmas Day 800 is regarded as a turning point in medieval history, marking a return of the Western Roman Empire, since the new emperor ruled over much of the area previously controlled by the Western emperors. It also marks a change in Charlemagne's relationship with ... |
How do various sea creatures know when they have swum as deep as is safe for them? | Opinion here, not fact. I’m curious if it would be like people climbing mountains. Go up too far and fast and it’s harder to breath. Everest has camps to acclimatize to the different air. So when our bodies say it’s hard to breath, then we stop or slow down. Perhaps the fish feel the depth pressure become more and mor... | [
"Hessler and Sanders were successful in obtaining a more accurate count of diversity of the deep sea floor because previous attempts, such as those from the Challenger, did not take into account the winnowing effect. As they brought their samples up from the deep, through the shallower water, the turbulence would c... |
Has a US president ever run for elected office at the end of his term? | John Quincy Adams did.
After losing in the presidential election in 1828 to Andrew Jackson he ran and was elected to the House of Representatives for Massachusetts' 12th district. He served until his death in 1848. I hope this is helpful.
I came across this while reading about the nullification crisis in
Donald J. R... | [
"Fourteen Presidents also served as vice president. However, only John Adams (1796), Thomas Jefferson (1800), Martin Van Buren (1836), Richard Nixon (1968) and George H. W. Bush (1988) began their first term after winning an election. The remaining nine began their first term as president according to the president... |
When did lions (cave or otherwise) die out in Italy? | I suggest you have a look at what ([Stuart & Lister; Extinction chronology of the cave lion
Panthera spelaea, Quaternary Science Reviews
(2010), doi:10.1016/j.quascirev.2010.04.023](_URL_0_)) have to say on the topic, namely:
"*It is remarkable that lion, in the form of modern Panthera leo, re-colonized a large area... | [
"BULLET::::- In 1830, a tiger attacked a lion at a menagerie in Turin, Rome. Despite having attacked first, the lion got it on its back, and used its jaws to hold the tiger's throat. The tiger died after that.\n",
"In 1978, two lions named Sultan and Sonia escaped from a circus in Lawrence. The circus' tranquilis... |
why do i root for an anti-hero or villain on television that i would hate in the real world? | A. You can bolster or ignore events more easily in a fictional world because what happens in it doesn't really matter. Even in real life I don't care that much about what Ted Bundy did, for example, because it was done to other people far away. And yes, that really is as callous as it sounds.
B. You fallow the anti-he... | [
"The sympathetic villain is one with the typical traits of a villainous character but differs in their motivations. Their intentions to cause chaos or commit evil actions is driven by an ambiguous motivation or is not driven by an intent to cause evil. Their intentions may coincide with the ideals of a greater good... |
What happened to Tenochtitlan during the first few decades of Spanish rule in Mexico? There used to be a huge lake (Lake Texcoco) in what is now Mexico City, how did the Spanish terraform the Valley of Mexico? | The process that led to the disappearance of the lake system in modern Greater Mexico City was very long, and actually began before the arrival of the Spanish and finished well after the independence. Since the arrival of the first Chichimeca migrations to the Valley of Mexico, the chinampa system was developed, a chin... | [
"Originally much of the valley lay beneath the waters of Lake Texcoco, a system of interconnected salt and freshwater lakes. The Aztecs built dikes to separate the fresh water used to raise crops in \"chinampas\" and to prevent recurrent floods. These dikes were destroyed during the siege of Tenochtitlan, and durin... |
why does japanese sometimes use english characters? | Because the Japanese find English to be cool. They wear T-shirts with English on it and like throwing English words and phrases into everything, because it makes everything cooler. Just one of the many bits of our culture that they like to borrow. | [
"Japanese is normally written in a combination of logographic characters borrowed from Chinese (kanji) and syllabic scripts (kana) that also ultimately derive from Chinese characters. \"Rōmaji\" may be used in any context where Japanese text is targeted at non-Japanese speakers who cannot read kanji or kana, such a... |
Do serious historians believe in the hypothetical Proto-Indo-Europeans? | Can you clarify what you mean by "believe in"?
If you take it as a given that the reconstructed language (for which the group — as speakers of said language — as here named) is actually something that was spoken, then there were speakers, and the Proto-Indo-Europeans were simply whatever group spoke it, and they may v... | [
"Researchers have put forward a great variety of proposed locations for the first speakers of Proto-Indo-European. Few of these hypotheses have survived scrutiny by academic specialists in Indo-European studies sufficiently well to be included in modern academic debate.\n",
"Theories of \"Pre-Indo-European\" lang... |
can someone ease my mind about radiation levels in California? | The titles of youtube videos aren't a great place for news on radiation levels. If any dangerous radiation is actually measured in california (which it won't be), it would be huge enormous news. Radiation levels in Tokyo have remained far below dangerous levels throughout this event.
Don't fall victim to people tryi... | [
"According to the Japanese Government, 180,592 people in the general population were screened in March 2011 for radiation exposure and no case was found which affects health. Thirty workers conducting operations at the plant had exposure levels greater than 100 mSv. It is believed that the health effects of the rad... |
It is rumored that the Samsung Galaxy S III will have wireless (not inductive) charging capability. How would this work? | Because it's just a rumor, I am basing this on other tech (WiTricity is an example). This all falls under the same umbrella as inductive charging. You are inducing a current by using a transformer and transferring energy between two inductors. The chargers you are thinking of need to be very close because it's cheaper ... | [
"In March 2015, Samsung included wireless charging embedded in the Galaxy S6 series. In June 2015, Powermat together with Dupont launched a Dupont Corian charging surface bringing innovation into the surfacing solutions world.\n",
"BULLET::::- March 3, 2015: Samsung announced its new flagship Galaxy S6 and S6 Edg... |
Studying history without the resources of a school | My first suggestion is start close to home. Most of the 'work' of the historian is going to be collecting evidence. You can do this by combing through primary sources from a thousand years ago. You can also do it by finding out when your home was built. When the town was founded. What was the origin of the street name ... | [
"Robert Bain in \"How Students Learn\" described a similar approach called \"problematizing history\". First a learning curriculum is organized around central concepts. Next, a question and primary sources are provided, such as eyewitness historical accounts. The task for inquiry is to create an interpretation of h... |
would a newborn baby from the stone ages, if brought to the modern day, grow up like any other child? | From what I remember hearing from a podcast is that you can take a human from up to 200,000 years ago and they would function just like anyone else, if you keep going back beyond that you start losing brain size and intelligence which depending on who you're comparing them to could probably still fit in today's society... | [
"Precocious puberty can make a child fertile when very young, with the youngest mother on record being Lina Medina, who gave birth at the age of 5 years, 7 months and 17 days, in one report and at 6 years 5 months in another.\n",
", the two youngest children to survive premature birth are thought to be James Elgi... |
Theoretically speaking if we tried to colonize Mars would we succeed and how long will it take until it is habitable for humans, animals and plants? | Mere minutes. Just drop the equivalent of a caravan onto the surface.
If you're asking how long it'd be before the planet had an environment that was compatible with human life, then without magic the answer is never. | [
"The first colonists of Mars and only ones to experience Mars as a world not covered in water, the Aborigines were meant to be the first phase colonizers of Mars until the flood that would cover Mars in water. After centuries had passed, Earth, believing that Mars was unpopulated soon allowed another group of colon... |
what causes the weird feeling in your head/teeth when you need to pee really badly? | Good heavens, I have never experienced or heard of that.
Do you know other people who get this besides yourself? | [
"The initial symptoms of pituitary apoplexy are related to the increased pressure in and around the pituitary gland. The most common symptom, in over 95% of cases, is a sudden-onset headache located behind the eyes or around the temples. It is often associated with nausea and vomiting. Occasionally, the presence of... |
the large hadron collider and how it could potentially cause a black hole. | The LHC doesn't split atoms. It accelerates protons to significant fractions of the speed of light and collides them. The particles that come out of this are made from the kinetic energy of the protons that were accelerated. | [
"The Large Hadron Collider at CERN in Switzerland, was designed specifically to be able to either confirm or exclude the existence of the Higgs boson. Built in a 27 km tunnel under the ground near Geneva originally inhabited by LEP, it was designed to collide two beams of protons, initially at energies of per beam ... |
Some questions about E = mc²? | > If we assume a photon as our frame of reference
This is impossible. Something moving at c doesn't have a valid rest frame.
> Applying E = γmc², the energy is supposedly 0/0, which doesn't make sense.
E = γmc² gives the total energy of a free, *massive* particle. It shouldn't be applied for a massless particle. F... | [
"The concept of human-equivalent energy (H-e) assists in understanding of energy flows in physical and biological systems by expressing energy units in human terms: it provides a “feel” for the use of a given amount of energy by expressing it in terms of the relative quantity of energy needed for human metabolism, ... |
If our brains cannot truly multitask, how can we do things like eat and watch TV? | The human brain essentially time-shares between tasks. However, your analogy is almost like saying, "why can we stand when we pee?"
I'd also like to point out that when you talk and drive you aren't entirely focused. Studies have shown that your reaction time is reduced to that of an intoxicated person. | [
"Human multitasking is an apparent human ability to perform more than one task, or activity, at the same time. An example of multitasking is taking a phone call while driving a car. Multitasking can result in time wasted due to human context switching and apparently causing more errors due to insufficient attention... |
why was st. louis such an important city earlier in the 20th century and why did it fall from such importance? | Rivers were hugely important to commerce in the early US, and St. Louis sits at the confluence of the Mississippi and Missouri rivers. It was also the Gateway to the West, serving as a lifeline to the frontier and a convergence point for west bound railroads.
As the 1900's progressed, the west got tamer, and the fron... | [
"The history of St. Louis, Missouri from 1866 to 1904 was marked by rapid growth, and the population of St. Louis increased so that it became the fourth largest city in the United States after New York City, Philadelphia, and Chicago. It also experienced rapid infrastructure and transportation development and the g... |
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.