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How some last names can survive the ages and get passed down but some simply vanish or just uncommon. | Sometimes people do not have children. Sometimes people only have daughters. Sometimes spellings/pronunciations shift. Sometimes spellings/names are altered for political reasons. Sometimes the method of determining last names changes in a cultureA prior TIL mentioned that the name Smith is so common because back when ... |
What would happen if charging interest on loans were to be made illegal? | If a lender could not charge interest on a loan, they would have no incentive to ever give out loans because they would be essentially throwing away their money. Even though they would get back the exact amount they lent out, the present value of it in a few years would most likely be less than it was when it was first... |
When did immigrants stop coming to North America primarily by boat? | Ship travel stopped being a primary mode of transport for immigrants when it stopped being a major mode of transport for civilian populations as a whole. Airlines started to be established in the 1920s and they took over as primary international transport method by the 50s. |
How strong of a password would the alphabet and then numbers 0-9 be? | The strength of a password is based on a two factors: * How likely someone can just guess it* and if they can't guess it, how hard it would be to brute force. If I was told a password was up to 36 characters it would be very hard for me to bruteforce that. But, if I could try the passwords for a million accounts, I'd p... |
When in an office chair, why is it so easy to accidentally roll over a cable, but then impossible to roll back over it without getting caught? | Momentum. Usually when rollin over a wire you have much more force behind you. When you go over the wire, you stop or just lose a lot of force, which makes attempting the same action with no momentum much harder |
If the average human heart beats 72 beats a minute. How can athletes have a resting heart rate of 40? | Athletes have very high aerobic capacity, because they regularly work out at a very high exertion level. As a result, their very fit hearts can pump all the blood their resting body needs at only 40 BPM. It's not a calm/Zen thing, it's a fitness thing.Their heart muscle is stronger than mine, so with each pump it pushe... |
why things visually appear brighter when you're hung over | When you are drunk, your pupils dilate and they also respond slower to changes in light level, this lets more light into tour eye, and things appear brighter. |
What is the extent to which an officer can use force if a person doesn't comply with what they're asking of them? | The usual rule for police is that if the person does not comply and the offense is an arrest-worthy offense they can use enough force to place the person within police custody. Naturally this wording seems vague but it means that the officer cannot do more than necessary to get the person in handcuffs and in the car, a... |
Why does walking backwards come so easy to us, when we almost never do it? | You might do it more often than you think, like when you open a door that opens towards you and lots of other situations you dont think aboutYour body has a sense called proprioception, which is what allows you to touch your nose or eye or whatever even if your eyes are closed. You are able to determine where your body... |
How come when I eat a decent amount of fruit/veggies, I don't feel satisfied. But a $1 cheesebuger leaves me full for hours? | Fat and protein lead to a lot more satiety when eaten. Vegetables can also make you feel full as a virtue of the fiber content. Oranges, apples and bananas also have a little fiber, but they also have sugar, which will often make you feel hungrier than had you eaten nothing due to how insulin and leptin work.Meat/prote... |
Why did humans evolve to eat cooked meat? | We didn't evolve to eat cooked meat so much as evolved the intelligence to cook it, which we have found makes it more palatable, and, more recently, safer and less likely to give us parasites. |
What would happen if you fired an arrow in a vacuum? | It would fly a little faster, but would probably tumble due to being front-heavy and not having air resistance to keep it point-forward.An arrow's fletching provided stability and occasionally rotation as well. These are both caused by the presence of air, so the fletching would have no effect in a vacuum. The lack of ... |
In terms of politics, what is 'gerrymandering' and how has it recently been put in to practice in UK/US politics? | My favorite ELI5s are the ones for which CGP Grey videos already exist for. It'd be a mammoth feat for anyone to explain it better than this video. _URL_0_ |
Why District of Columbia? | Columbia is the female personification of the United States . The name comes from Christopher Columbus. Washington because of George Washington. |
How chip based credit cards are safer than regular cards. | The idea is that the "secrets" are held in the chip. Basically the reader is hosting the transaction between the bank and the chip. All the reader sees is "the transaction was approved." Whereas with a magstripe you have to tell the reader all your details and then it relays them to the bank . edit: basically the proto... |
Why does bitcoin fluctuate so heavily? | Traditional currencies trade based on economic factors about the country they are tied to. The factors to look for are well known and traders have a good idea how new data will affect the price. This is why currency values are relatively stable. Bitcoin's value is based almost entirely on speculation. Speculative asser... |
What does dying of "natural causes" mean? | Essentially what happens is the body looses the ability to fight off common bugs, bacteria, and the wear and tear of living. The little things all pile up as little problems leading to bigger problems until the body just stops. Generally speaking there is not specific thing that kills them, but a ton of little things. ... |
Assuming it's the same distance, does running in the rain actually makes you less wet compared to walking? | From many years of experience running daily: If it does, the difference might as well be negligible. You're still getting wet.Yes, assuming constant rain and nothing covering your head. There are two factors which determine how wet you get, ignoring puddles and jerk drivers who splash pedestrians. First, is your horizo... |
Why does it seem like Black sitcoms were more popular with white people in the 70s and 80s? | I was born in the early 70's, so a lot of the 70's sitcoms, I only remember via a haze of childhood, and the fact that I was really only interested in shows with space ships or cars that jumped over shit. The 80's however, is a different matter, TV wasn't so spread out back then, "Black" sitcoms tended to just be sitco... |
So there are dominant and recessive genes. Why is the recessive gene recessive? | Say that the first version of the gene produces X protein, and the second version does not. If you have any copy of the first version, your body will have some X; the only way you can end up with no X is if you get two copies of the second version. Now, if your body has some process that doesn't care about how *much* X... |
How does an automated telephone assistant know which numbers you dial? | Yes. It's actually two tones overlaid on top of each other. One tone indicates which row contains the button you pressed, and the other indicates which column. A computer can easily pick out the two tones, and work out which button they represent.Most phones that interface with the traditional "dial tone" public phone ... |
why do some bees give people allergic reactions but not others? And how is the degree of reaction determined biologically? | All allergic reactions center around a group of proteins called MHC. MHC proteins are used by your immune system to show your T cells pieces of proteins from your cells and from around your cells. If the T cell is activated by an interaction with an MHC protein-piece complex, then the cell showing it gets activated and... |
Why does the moon turn red? | Light bends around the Earth. Red/orange has the longest wavelength and bends the most, shining on the moon. The blues/Violet's and all other colors of light don't bend as much and are deflected slightly away. |
How do they determine the expiration dates for new products? Do they just let it sit somewhere till it goes bad? | Plant Engineer at a food manufacturing facility here. We know how long it takes for ingredients to become unsafe when stored under the proper conditions. These conditions are determined by microbiologists. If a food item is made with multiple ingredients then it is the fastest expiring ingredient which becomes the expi... |
How are new Pharmaceutical drugs "designed"? | One way, based on structural biology, is to determine the 3D structure of an enzyme or protein and use computer modeling to design molecules that fit into its shape. A common method is to determine where the native substrate sits and design molecule which fits the site better. Another method is to take existing drugs a... |
Shouldn't things like the "Law of gravity" or the "Laws of thermodynamics" correctly be called "theories" instead? | The scientific laws are generally just observations, not theories. The law of gravity doesnt explain gravity, it just describes it - whereas the theory of general relativity provides a model for how gravity works within the bounds of spacetimeTheories and laws are very different things. Laws are not "above" theories. T... |
How can they prove paedophilia, such as Rolf Harris, decades after the offences? | They usually take statements and try to corroborate them with accused testimony alibi.I watched a case link to Jimmy Saville where the women described a wall covered in graffiti where she was raped, years later they took new wall paper down and it was still there, all names of underage girls and their phone numbers. Th... |
What gives acid a burning property like Sulfuric Acid? Why doesnt Vinegar or Lemon juice "burn"? | Acids have their strength measured in a scale called pH . pH stands for "potential of Hydrogen", which means how aggressively the acid will work to take or acquire a hydrogen atom from a substance it comes in contact with, or how likely to donate one, in the case of an alkaline solution. The pH scale reads from 14 to 0... |
Why do sheep and goats have oblong/square pupils? | Goats are prey animals. They have rectangular pupils because it gives them a much wider peripheral vision. They also rotate in the socket so when they have their heads down to graze their vision remains level. |
How does povery affect world security | A simple way is that poor people don't really have much going for them, so they don't have as much to risk by committing a crime. Sounds a lot like a homework question to me. Could you explain the context of your question?", 'Well, let me ask you this: If you had a Master's degree, a career, a house, a spouse, and kids... |
How can fingerprint scanners unlock your phone regardless of what position the finger is in. | It's looking for key features in the image of your fingerprint, and the angles and distances *between them.* That doesn't change. |
How does Wheel of Fortune make money? They give away thousands per episode, even to the people who don't win. Does advertising actually make them enough money to cover this loss? | Yep, it's all about the ads! Commercials on network TV during primetime can cost thousands of dollars per second - I've heard that a 30-second commercial running during The Big Bang theory can cost over $300,000. I'm sure that Wheel of Fortune ads aren't nearly that expensive, but even at a fraction of that cost, they'... |
How do fireworks achieve different patterns when they explode? | I've searched tha seven seas fer an answer. Yer not alone in askin', and kind strangers have explained: 1. [ELI5: How do some fireworks makes shapes and whatnot when they explode? ] ^1. [ELI5: How do fireworks create shapes like hearts, smiley faces, etc? ] ^1. [ELI5: how do fireworks have specific patterns when lit? ]... |
Is sleeping too much actually harmful? If so, why? | Yes. Well, probably. Kind of. Oversleeping has been pretty strongly linked to all kinds of bad things like diabetes and increased risk of death.It's also strongly correlated with depression and low socioeconomic status.Those facts don't necessarily prove that oversleeping is bad; i.e. depression could make someone want... |
Why hasn't voting gone digital, like nearly everything else? | Have you ever had to spend most of a day explaining to a beloved grand/parent just how to do anything online, especially if an installation manager is involved? Voting would take like 10 times longer.Every time you build a better mousetrap, along comes a better mouse - meaning, we have a hard time trusting a count when... |
So, what is Tumblr really? Is it more than just pictures? | It's a blogging website. You make posts to your own blog and then other users can find and follow your blog if they like your posts. You can also re-blog anything you find on another Tumblr user's blog and post it to your own blog . The source of the original material will automatically be posted when you re-blog. Othe... |
Why do Dogs and other animals grow so quickly in relation to Humans? | Well in a lot of animal species, you need to 'grow up' quickly in order to be able to fend for yourself. It's hard to reach reproductive age if you get picked off by a lion early on, or you can't get enough food for yourself. So there's evolutionary pressures for a number of species to mature quickly through those earl... |
What is the difference between USB 3.0 and Thunderbolt? | if you are only getting a single drive, and its not an ssd, it does not matter. both connections are way way faster than the drive is. you only need to think about this when the that connection speed becomes a problem. there are some advantages to thunderbolt that popularity of usb still negates if thinking about stora... |
What exactly is "wind"? | Wind is what we call the movement of air over the surface of the earth. The reason the air moves around like it does is that as the temperature of the earth's surface changes, due mainly to the sun's influence, the pressure changes in different areas of the earth. When an area of lower pressure occurs, air moves from t... |
Why don't tornadoes go into a major down town area with sky scrapers? | It's due to the size of cities. They can go through download areas, but you have to realize that downtown areas are very very small in comparison to the size of tornado alley. [List of downtown tornadoes]", 'My opinion is that the tall buildings help break up the straight-line winds that fuel the tornado. Tornadoes do ... |
Whats the difference between cults and major religions? | In a cult there is one person at the top that knows it's all a scam In a religion that person is dead. Some may think this is a joke and it does have a funny side to it I will admit but it is also absolutely true. L Ron Hubbard had a cult but now he's dead and Scientology is no longer just a cult it's a religion. Sure ... |
How can Wim Hof raise his blood pH through the use of a breathing technique, directly influencing the immune system? | I have no idea who/what Wim Hof is, but breathing absolutely influences your blood pH. When carbon dioxide is in your blood, it is converted to H+ and HCO3 , which are both dissolved in your blood. H+ is what determines pH . When the bicarbonate reaches your lungs, it is converted back into CO2, which can be exhaled. T... |
What is the difference between an Emoji and an Emoticon? | An emoji is a little picture, while an emoticon is a collection of letters and symbols which look like a little picture |
Do we know where the 'edge' of our solar system is? If so, how? Where is the line, and why? | There are multiple definitions, including: * beyond the orbit of the farthest planet* the *helieopause*, where the solar wind is no longer distinguishable from interstellar space* the point where the sun's gravity is no longer greater than other stars'", 'By whatever means you find your answer I sincerely suggest givin... |
How come oil is the cheapest it's been in over 30 years but my gas / petrol price is the same as it was this time last year? | the price of gas you´re pouring in to your tank now is a combination of : Oil is sold with a delivery date, it can be between 90 and god knows how many days, so in the best case you´re paying a gas price based on the oil price from 3 months ago. Now the actual price of oil only constitues to around 30% of the price of ... |
How is a huge number (I. E. Graham's Number) proven to exist? Couldn't anyone just add 1 to that number to prove an even larger number exists? | All integers exist. There's no need to prove any specific number exists. Integers have no upper limit. If you have an integer, you can indeed add one and get a bigger integer. But some of these integers are special. What's special with Graham's number is not only that it's very big or that it's proven to exist, but tha... |
Why are ancient buildings still standing to this day but modern building fall apart after a couple decades? | You are missing the millions of buildings which have fallen down since ancient times; you're only seeing the few that have lasted. Given another several millenia, I'm sure a handful of today's buildings will still be mostly standing while the rest have fallen. Also, the ancient building still standing have been cared f... |
Why are we afraid to do something when the result can only be better than doing nothing? | In some cases, even when we know that doing any action is better than no action, most people still want to optimize to do the best action. Suppose I give you three envelopes, and I tell you that one contains $100, one contains $1000, and one contains $10000, and you get to open one of them and keep the contents. You mi... |
What would happen to a person's body if they die adrift in outer space in a full space suit? Would they float around forever? | Your body would freeze-dry and you'd rapidly mummify. The low pressure would cause most liquids, like water, to evaporate. And the low temperature would cause the freezing. Most micro-organisms would be killed for the same reason . You skin may also brown from different types of radiation in space. You may also see sym... |
How does Tylenol and Motrin reduce fever? | Motrin/ibuprofen decrease fever by lowering levels of chemicals that tell our brain to raise our body temperature. These chemicals are called prostaglandins and thromboxane. I'm not sure how acetaminophen does it, but it's through a different mechanism. It acts on the brain's temperature control centre and tells it to ... |
Why are ISIS referred to as "so called Islamic State" on BBC? | They call themselves the islamic state. ISIS is not recognized as a legitimate state by any other world government. So while it's correct to call them "The Islamic State" in the sense that that's what they call themselves and people know what you're talking about when you say that, it's also not a state in an official ... |
why does my bruise look purple with lots of smaller darker spots in it? | Think about it this way: when you bruise, you are allowing blood to pool in area's that it isn't normally. This causes your blood, to start clotting, and being degraded at these bruise sites. Your blood clots at multiple points in these bruises, and starts being degraded at these spots, so those spots are going to look... |
Why can't cell phones act as noise-cancelling headphones? | The waves your cell phone records are too far away from your ear for the phone to just spit out an inverted waveform as active noise cancelling headphones do. With multiple recorders and knowing the exact position of where you want to cancel the noise, this would still be doable but most if not all cell phones only hav... |
How do Blu-ray Discs know where I stopped watching the movie, even if I restart it on a different player? | The disc doesn't know. Its The player that remembers where you stopped when you last loaded this disc |
when you take pain meds like aspirin or ibuprofen, does it go treat the pain at the location or is it a general dulling of pain in your whole body? | Once NSAIDs such as aspirin are absorbed, they are widely distributed throughout the body. The drug doesn't all localize to the site of inflammation, and it's not as though there is some substance that binds the drug and carries back only to the injured cells. Unlike opioids which act centrally, however, NSAIDs act loc... |
How did the disengagement of autopilot on Aeroflot Flight 593 cause its crash? | The captain let each of his kids sit in the left seat and manipulate the control column. Because the aircraft was on autopilot, the captain assumed their inputs would have no effect on the flight. However, when the son was at the controls, he held the control column in a bank long enough for the autopilot to disengage ... |
Firewall, antivirus, antimalware. | Firewall stops incoming/outgoing programs/connections on ports/ Antivirus is kind of passive, it detects dodgy exe's that are trying to make changes to the machine malware is somewhat like a virus, except it usually comes in under the guise of working software . You install it expecting it to be great, and while the pr... |
How do UN diplomats understand each other? | The UN has six official languages: English, French, Russian, Spanish, Arabic and Chinese. There are real, live human translators that translate what's being said in real-time. UN diplomats must be able to communicate in at least one of those official languages. If they don't understand what's being said, they have head... |
Why do we still have court stenographers? Why don't they just record all the audio in the room? | The purpose of the transcripts is that the lawyers and judges can review what was said at a later date, and then reference it in motions and briefs. You might have a court hearing, then later file a motion saying something like, "As Officer Johnson said, \'The accused was nowhere near the scene of the crime at the time... |
What is the use of a steam trap? | Where I work steam traps are used to separate condensate from steam. The traps are located along and at the end of steam lines. Once enough water is present in the trap it dumps it out of the system into a condensate line . We use cheap traps which corrode/otherwise fail quickly and rapidly become steam leaks I'm not s... |
Illegally earned income in taxable, so how do criminals pay taxes on their money without incriminating themselves? | They don't. That's how the government can often get criminals in jail if they cannot prove they committed the crimes they committed.File a schedule C and put your business type as "consultant." Claim reasonable deductions percentage-wise and make quarterly pre-payments. The IRS doesn't bother much with tax returns with... |
If you're slowly being buried alive by sand, (i.e. Aladdin) why can't you step on top of it as it fills up? | When fine particles are in movement they take on the characteristics of a liquid it's called fluid dynamics Basically as the grains of sand are poured around you, they're still in motion and haven't had the opportunity to settle yet and so there is no solid surface on which to stand. You'd actually be better off trying... |
If I eat a really spicy pepper and then eat a less spicy pepper right after, will the second pepper just add to the spiciness or will it not be spicy at all? | It most likely will not be spicy at all. The active ingredient in spicy peppers is Capsacin eventually causes the nerve endings to desensitize. Hence why when we eat spicy food, after a while your tongue becomes numb to it. |
Why do doctors/surgeons, especially in major hospitals, work really long shifts? | im not a doctor but i feel like the obvious answer here is that if a hospital has doctors working those kinds of hours its probably because its the only way to make sure there are doctors available 24/7. i mean, they cant just say "sorry everyone, we would like to help you but our doctors already hit their 10 hours for... |
Why does my iPad detect the touch of my fingers, but not my knuckles? | Nowadays touchscreens are capacitive. Your finger is an electrical conductor, so touching the surface of the screen results in a distortion of the screen's electrostatic field. That said, there's a sweet spot. If your fingers are too conductive or not enough conductive, the screen doesn't recognize them as a finger and... |
How can Russia possibly deny that what is happening in the Ukraine is an invasion by their military? | Because they don't think anyone has the balls to call them on it and try to stop them. |
Why does working out make your veins show more? | A few things: 1. in the short/immediate term you're simply pumping more blood through your veins - a physiological response from the increased demand on your body. 2. in the longer term, you're likely working towards a lower body fat. Lower body fat will result in more veinous structures being closer to the skin's surf... |
How is Islamic State in Syria and Iraq able to access the Internet? | Why would the world want to shut down a source of intelligence? All communications out of those locations are being monitored. Sometimes they fuck up and give us their plans. Also, in my opinion, the powers that be do not want the recruitment to stop. They either want to weed out who can be converted, get them in one p... |
Why are dental and vision insurance separate from medical insurance? | Tradition. Dental and vision insurance is a relatively new thing compared to regular medical insurance. Your parents probably paid for these services entirely out of pocket for most of their lives. |
Why does the U.S college costs so much while many european countries have it for free? | Just generally speaking, a difference in priorities. Some populations like the idea of government-funded post-secondary education and vote for politicians that reflect that viewpoint. Other countries would rather the government spend elsewhere or just spend less in general, so colleges are consequently largely private ... |
How an ionic foot detox removes toxins from your body. If it can't, why? | Do they use this in an emergency room when someone is suffering from some form of toxicity? NopePro tip: Anything that talks about "toxins" without specifically naming one is a scam. |
Why do animals enjoy being pet/scratched? | Have you never had someone scratch your back before??I know for a thing that i enjoy being petted a lot |
Why men statistically commit more criminal acts than women? | Probably because crime is a high risk high regard act. Men, typically associated with being resource gatherers, are more likely to engage in such crimes than women. In violent crimes, similar stories. Men are more likely to demonstrate direct aggression due to factors like more testosterone. |
How we get pictures of the universe, with our solar system in the picture? | We don't. It's painted or made in a computer. We also don't have any photos of our galaxy and we don't even know what it looks like. |
Why is tobacco use frowned upon on in majority of sports but is extremely accepted in baseball? | Because baseball players don't need to keep up the standard of health required for more athletically demanding sports", 'I challenge the use of the phrase "extremely accepted." I think "tolerated" would be more accurate. Furthermore, in this day and age, I think you see fare more instances of bubble gum than you do of ... |
The Golden Ratio and how it relates to the world around us and the Fibonacci Sequence | Let's start with the fibo sequence. 0, 1, 1, 2, 3, 5, 8, 13 Each term is found by adding the previous two terms. The first two terms are 0 and 1. So the third term is 1 because 0 + 1 = 1 The fourth term is then equal to 1 + 1. So 2. Next comes 3. And then 3 + 2, so 5. And on and on. The golden ratio comes about from th... |
Why is the average temperature of the Earth still rising due to global warming even as holes in the Antarctic ozone layer are healing? | These 2 things are unrelated. Global warming is mostly caused by an excess of greenhouse gasses. The holes in the ozone layer were caused by our use of CFCs which damage the ozone layer. Since CFCs were banned the ozone layer has been able to recoverTwo quite different concepts. Global warming is the measure of how muc... |
Why do you sometimes take a nap and wake up in an even worse mood? | You are probably "napping" too long, and actually falling asleep for a longer period of time. Rapid eye movement occurs about an hour and a half after you fall asleep initially, which when woken up in the middle of, will often cause grogginess and lethargy. When taking a nap, you don't need to fall asleep; your aim oug... |
Why do the vast majority of 8-bit (and some 16-bit) video games use the same font? | It's because your fonts can only get so complex on such a low pixel count. It's a font with good thickness, visible curved corners, good contrast, and getting kerning to work will be a hassle. It's a good font, that's been on some good games, so it's a sort of accepted standard. What kind of font would YOU design for i... |
How much money is there in the world in total and how's it measured? | For a while counting is the simplest way to measure money. I say that because eventually it gets tricky. There is of course the cash money. Money in our pockets and in the cash drawers of registers. That is the smallest amount. It is counted as it is produced and banks count it as it comes in. Then there is money on de... |
What is the purpose of sharps/flats in the chromatic scale? | To help players recognize intervals. We recognize the distance between C-double-flat and f-sharp. Even so, so few pieces are written too chromatically to be easily sight read by a talented player that t wouldn't be worth creating a new system. |
Why does it seem like there are so many shady businesses and outright scam artists based in Florida? | Also the warm weather and beaches attract people looking for easy money without putting in the hard effort. Why should I go to school in the northeast and bust my butt when I can mooch off the people at Pompano Beach?', "It's probably a combination of things, here's a couple I could think of: * First and foremost, Flor... |
Why is Gas getting so much cheaper, how much cheaper will it get, and how long will it stay cheap? | [Saudi Aramco] has substantially increased oil outputs by request of the US and some western countries. This has largely increased the the supply of oil, which has driven down the price big time. The US asked the Saudis to do this in order to put pressure on Russia, who makes nearly 60% of their income from oil exports... |
How are all the Fate works by TYPE-MOON interconnected? | Fate/stay night is the main body and details the 5th holy grail war. It consists of 3 main routes: Fate, Unlimited Blade Works and Heavens Feel. It has 2 anime adaptations and 1 movie: - Fate/Stay Night , which adapts the Fate route, but mixes in things from 2 other routes.- Unlimited Blade Works , adapts a gutted vers... |
How does aloe vera help sunburns? | It probably doesn't. It seems that it's no more effective than a placebo. "The results showed that the aloe vera cream has no sunburn or suntan protection and no efficacy in sunburn treatment when compared to placebo." _URL_1_ A few more examples in this NY Times article. _URL_0_Off topic but does anyone else get itchy... |
Why does the shower squeal and shake when turned on slightly? | You know how whistles and musical instruments work by causing air to vibrate when under high pressure? The water is doing something similar, just at a much lower frequency. |
Why there's always a period of time before takeoff when there's no air conditioning on the plane. | Pilot and aerospace engineer here! If you're doing a cold start on a commercial jet, you'll typically use the onboard battery to start what's called an APU . This is basically a small turbine that uses jet fuel to produce electrical power and compressed air for the aircraft. The APU is typically located at the tail of ... |
why do educated/teachers and professors tend to be more liberal? | It's a combination of factors, but the definition of the term 'liberal' is probably important to the answer. I'm gonna go with this flavour. > open to new behavior or opinions and willing to discard traditional values As a GENERAL trend , people with a liberal point of view have a tendency to want to help their fellow ... |
What are these random pains we sometime experience for a second or two, in arbitrary place of the body? | This is the first nuked ELI5 I've seen that didn't at least have an answer in the comments leftover.Removed!? I was just having a random pain in my left ass cheek last night and I was wondering the same thing!I thought the new administration wanted to stop nuking threads? |
If insects are attracted to light so much, why don't they fly towards the sun? | The reason for 'insects circling/getting attracted to lights' is thought to be something called 'transverse orientation'. The wiki article about it is a stub, so let me try to explain it to you. **What is transverse orientation -** Insects can fly in a straight line by maintaining a constant angle to a *faraway* light,... |
What caused that "crackling" background sound when you played music on old gramophones? | Those records encoded the music in the shape of a spiral groove which covered one whole side of the disc. A stylus was dragged the length of the groove to get the sound that it encoded. If the disc was dirty or the groove was damaged, there would be a crackling sound. I called it \'campfire music\' because it sounded l... |
What are the disadvantages of masturbation? | Only one I can think of is that you get use to the particular tighness of your hand and when you finally have sex with a girl, a vagina doesn't feel right or tight enough thereby leading to the inability to climax or experience full enjoyment with that girl. |
Alaska and TAX Exempt and why it's there. Would it apply to a European immigrant? | I just moved from Anchorage, Alaska, so let me answer some of this! We often have sales tax at city, county, and state levels. So sometimes that adds up to a lot. In Anchorage, Alaska, there are no sales taxes at any level. The price on the shelf is the price the item actually costs you. We also have income tax , levie... |
What a Hedgefund is please | A hedgefund has a few properties that define it: 1. it pools assets from many investors. 2. all investors must be "accredited". This means you have to have lots of assets or a big income, or be an institution. If you're making 100K a year and own a $500K house, you're still not wealthy enough to participate per federal... |
How does solar radiation work and what can exposure in space result in? | The sun emits dangerous radiation . The earth protects you though. If you go too far away though you will be in danger after long enough if you don't have sufficient protection. They didn't have sufficient protection on the trip to the moon, but it was a pretty short trip so they weren't in any serious danger, at least... |
How did WW1 Fighter Planes keep from shooting their Propeller off? | The gun was connected to a gear system with the propeller. It would stop the guns action when the propeller blade was moving in front of the gunThere were gun timing mechanisims.This article will explain it for you.Source: aircraft mechanic._URL_0_', "You are going to receive many responses saying that timing mechanism... |
Is it possible (and effective) for electrical impulses created by brain to recharge a battery? | An action potential of a neuron has about 130 mV difference between its highest and lowest point. If you somehow manage to wire a lot of them together, you could get enough current and voltage to charge a battery. But I hardly doubt that this would be possible without causing severe damage to the unfortunate brain. If ... |
Since Queen Elizabeth doesn't use a passport when crossing international borders, does she use any sort of identification document? | What I heard is that they arrange everything beforehand, so when the Queen travels to another country there's no need to going through immigration control and that kind of bureaucracy because it was already done.no, she has no drivers license either. She is exempt from that driving rule. She keeps a few mints, a comb, ... |
How do credit scores in USA work? | Ok Imagine you're parents have a lot of money. You want to borrow some of that money from them to buy a new toy. You explain to them why you deserve the toy and they consider it. They look at your allowance, if you have borrowed from them before, also they look at how many promises you have made to them and kept. Using... |
What are the white, cloudy trails airplanes leave behind in the air? | Airplanes use hydrocarbon fuel very similar to automobiles or even a wood fire. The chemical reaction which is happening turns some amount of oxygen and some amount of hydrocarbon into carbon dioxide and water. While there are some additives in the fuel which result in chemicals which are harmful to the environment, th... |
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