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What happens to the physical money when doing international transfers?
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In the most simplistic terms. Your bank in the US will have a contract in place with a transferring bank in the US. They will do an electronic transfer to the Transferring US Bank. The transferring bank in the US with agree a transfer with a Transferring Bank in Germany and the Transferring bank in Germany will do a tr...
Other
How does shaving gel go from a blue viscous liquid to a foamy thick liquid?
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The blue liquid inside the can is very thick and full of little bubbles (like a chocolate mousse, but much tinier). The bubbly liquid is packed into the can really tightly, there isn't a lot of space, so the bubbles get squished down smaller to make room. When the liquid comes back out of the can, the bubbles have lots...
Chemistry
capacitors. what do they do? what is it for?
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You can picture a capacitor like a tiny battery that has the ability to charge and discharge very, very quickly. They have all kinds of different uses, but they're often used as a kind of energy buffer. Digital chips for example don't draw power continuously, but instead they draw a large amount of power for a fraction...
Physics
What is ear wax, where does it come from?
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Imagine ear wax to be like a fusion between sweat, and mucus. It is produced in the ear in glands (much like sweat), it lubricates the ear, and protects sensitive tissue by trapping dirt and other particles much like mucus does. A fun fact, most people are divided into two types dry or wet ear wax. Dry being most commo...
Biology
Why is the big bang seen as a singular event, and not a continuous event among most scientists?
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It was originally though that yes the expansion would slow down and then reverse because of gravity. But it's not the case. When you look at far away star we see a redshift of the light, meaning that those star are going away from us. And even more importantly, the further a star is from us, the more redshift we see. M...
Physics
How the hell do firefighters find the source of the fire in a completely burned down house?
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In most cases they do not find the cause of the fire. Especially if the house is completely burned down, collapsed or if the water have washed everything away. But it is possible to see some signs as things do burn differently depending on the temperature, length of time and available oxygen. So for example if the wall...
Physics
why do workers in America have terrible employment rights?
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> To begin with, I live in the UK and work for an international famous home furnishings company OK. People are going to give a lot of answers about corporate power in the US but the fact is that large corporateions have power in other countries as well but you don't see this happen there. The real reasons come down to ...
Other
How come armpits and feet have their own unique bad scent? (onions vs Fritos chips?)
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The armpits have what are called apocrine glands. These are special scent/sweat glands which have a high protein output. Bacteria thrive here, breaking down this protein, creating one type of body odor. Feet do not have this type of gland, but due to wearing shoes and socks, the warm sweat sits there, and sits there, a...
Biology
What does the term "gaslighting" mean?
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So it originates from a play/movie in which a husband would mess with things around the house and then deny the changes when she noticed them, in an effort to make her think she was disconnected from reality. For example, he would dim the gas lights at certain times and when she'd ask about it, he'd say they hadn't bee...
Other
What is motor oil actually made of and why is it called a “fossil fuel”?
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Motor oil, like gasoline, is made from crude oil and crude oil comes from the ground. Coal, crude oil, and natural gas are all considered fossil fuels because they were formed from the fossilized, buried remains of plants and animals that lived millions of years ago. Because of their origins, fossil fuels have a high c...
Earth Science
Why in the armed forces is the rules of engagement usually "do not shoot unless fired apon" but ploce officers in the states can fire if they feel threatened?
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Former military and a former cop. Outside of movies, those aren’t the rules of engagement. They are much more complex and involve a use of force model that permits engagement when the danger of death or seriously bodily injury appears imminent...which is the same standard applied to the police. Rarely a limited engagem...
Other
Why is there so much smoke produced after a fire goes out?
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When something burns hotly, it burns cleanly. When you take away the flame, it has enough embers and residual heat to continue smoldering, but without the heat of the flame the result is incomplete combustion resulting in smoke and soot. Details: What is smoke? It's soot, and carbon compounds, tar, aerosols, un burned ...
Chemistry
What set of economic circumstances allows for creation of so many Japanese companies that seemingly make everything (Hitachi, Mitsubishi, Yamaha, et cetera)?
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URL_0 You have to look at the origins of these companies, not through the lens of modern capitalism but rather a feudalistic view of the world. You couldn't just start up a company to make some new product because: A) common people didn't really have any money and B) you needed royal permission to start a business So, ...
Economics
How does the satellite business work? How do the small telecom companies get access to satellites that costed millions to get into orbit?
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So, now the real answer There’s a lot of satellites up there with a lot of capacity. It’s a very mature industry and capacity is always available. There’s actually a lot more space than the sat owners can sell at market rates. Space/capacity on the satellites are leased out to other companies. It’s actually not that ex...
Economics
Why is it that when you see a computer screen in a movie or on tv it doesn’t do that distorted thing that always happens when you see a computer screen in a video shot with a commercial video camera?
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Most screens in movies and TV shows are faked with CGI. They just replace the real screen with an image of whatever. Screen flickering is part of the reason, but it also solves issues with screen glare, the screen appearing dim, etc. It's just easier to put in fake screen in post-production than to deal with a real scr...
Technology
Why is latency and bandwith separated? If latency is delay of data, and bandwith is data over time, shouldn't one affect another? If it takes 5s for a car to start, and 10s to reach it's destination, then the average speed would be spread out across the whole 15s. Should this not be the same?
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Consider conventional mail (via a post office). This a high latency, high bandwidth type of communications. It takes a few days to get a shipment somewhere, but that shipment can contain almost unlimited amounts of data. Contrast this with SMS (text messaging). This is fairly low latency - your text message arrives alm...
Technology
How does data transmission from something like the ISS work? Those are massive distances and i guess a whole lot of data. Are there some special protocols are massive antennas?
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The ISS is **much closer** to your house than the DirecTV satellite that sends your TV programs. Not at all a massive distance, it's 400km (about 240 miles) above the surface of the Earth. There are some nice antennas and a network of ground stations, but it's nothing like New Horizons photos from Pluto.
Technology
How do motorbike riders drive safely in the rain? Rain drops on helmet, boots wet etc
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Not sure in what respect you mean, really, but... Good tires with decent tread. Some tires are better in water than others, same as your car. Riding properly for the conditions. Allowing more room for braking, more time for errors. Being a bit more methodical. Boots? yeah, improper footwear can be a hazard on slippery ...
Other
When people say we share 65% of our genes with a banana, what does that actually mean?
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The basic building blocks are all the same. A pizza shares about 65% of its ingredients (flour, water, sugar, salt, etc) with a chocolate cake, and a car shares about 65% of its components (steel, copper, rubber, etc) with an aircraft carrier. It's the ones that are different that differentiate the two.
Biology
How do RX Bars only have 15 grams of sugar?
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"1 date" is not an accurate measurement since all dates are different sizes, weights, and densities. An average 100g of dates has 63g of sugar. So figure your math based on that. Also food labels and marketing are not accurate which is why if you really care about macros, you should be measuring your own food.
Other
how does it turn into a perfect circle?
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The bubble applies a constant outward pressure to the string. The parts of the string that are more sharply curved are straightened out by this pressure (like pulling outward at the tips of a bobby pin to bend it straight). This force balances out when all of the string is curved the same amount. A shape where all of t...
Physics
Why do some states, (Texas, Florida, California.) have 2 teams of each sport?
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It really usually has less to do with states, than size of Metropolitan areas. The states you mention have large metropolitan media market. In fact, if you look at URL_0 , you will see that most of the major media markets have sports franchises. Outside of the historical oddity of Green Bay, almost every franchise exis...
Other
Whilst drinking alcohol, does drinking water slow down the process of getting drunk, or does it simply combat dehydration and therefore limit he hangover?
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~~Drinking water helps move the alcohol through your system a bit faster, meaning more of it gets passed out in your urine and less absorbed into your bloodstream. Some might call that a waste...~~ EDIT: It turns out all of the above is untrue. I always believed it to be the case, but when other redditors started sayin...
Biology
Why even after having so many advanced technologies in the world do we still need humans to clean the windows of the skyscrapers?
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We don't "need" them. Not in the sense of "if they didn't exist we'd have no way to do it". There are machines that do it, but they're generally more expensive, not faster, and no less risk than a well-trained crew. So it becomes a case of "it ain't broke, let's not fix it."
Other
Why can't we use text in things like italics or bold in cell phone text messaging?
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The SMS standard is plain text only, so doesn't include any formatting information - adding it on new devices would break compatibility with older or simpler devices. However, some SMS apps will allow it by using basic markup, such as enclosing text in asterisks in order to signify bold. Apps which recognize this will ...
Technology
Why does electricity make noise sometimes?
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Because certain kinds of electricity wiggle back and forth. And this wiggling causes the parts conducting the electricity to vibrate, making noise. The most common one you'll hear is [mains frequency]( URL_1 ). It's 60 Hertz (Hz) in North America, and 50 Hz in Europe. You'll hear things like big electrical transformers...
Physics
Bicameral legislatures - how do they work and why do they exist?
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A bicameral legislature is a system in which two bodies are responsible for making laws. Both bodies must agree on and pass a bill before it can be signed by the PM/president/whatever and become a law. The United States is an example of a bicameral legislature. The two bodies that make up our congress are the Senate an...
Other
How fire fighters ,most of the time, are able to determine what caused the fire? How can they do such a thing if everything is burned down?
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I stole this from a google search I did: The easiest way is usually to ask the occupant of the fire building. They can usually tell you where they first discovered the fire. If no one was home, you follow the damage. Usually the room where the fire starts will have the most damage to it from heat. In a single room and ...
Other
Why did controllers in the 80s and 90s require calibration? How come we dont need to calibrate controllers now?
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The way older joysticks were built, the software had no way of knowing where the 'center' was, and how far the joystick could move before it hit max tilt - so it had to measure those values itself. (Similar to taring a scale). These days there are little chips inside the joystick which know those values through factory...
Technology
Why some factories runs 24/7 while others can do only dayshifts?
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The cost of running a factory can be split into both fixed costs and unit costs. The fixed costs are costs of the equipment, tools, buildings and such which does not depend on how many actual units you produce. The ratio between fixed costs and unit costs varies a lot between different products. If you have more shifts...
Economics
Every year, more money is "pumped" into the economy, and prices go up, wages go up, expenses go up... Where does all that money come from?
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Mostly loans. With fractional reserve banking savings accounts in a bank only need to be a fraction of the loan balances the bank has. Typically it's about 10%. So if Alice has $1 and puts in in her bank account, the bank can then give Bob $10. Bob can buy a $10 widget from Alice, and she puts it in her bank account. B...
Economics
Why is it that we generally find food that's bad for us more delicious than food that's good for us?
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That food isn’t *inherently* bad for us, we just eat too much of it. This leads to problems like obesity, because these “unhealthy” foods contain a lot of energy and nutrients. Before modern farming and food processing, it was hard to get salt, fat, and other nutrients in the diet. It was also hard to *get enough food ...
Biology
what causes us to involuntary make silly faces whenever we taste something hot, sour, or bitter?
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One theory is that it's an evolutionary trait that warns those around us that what we are eating is potentially unsafe, poisonous, or toxic, as bitter or sour tend to produce a visceral reaction whereas salty or umami or sweet don't produce a noticeable reaction (unless they're disgustingly so, I suppose. Like extremel...
Biology
Why do many of us simply never get car/air/sea-sick, if it's supposed to be a normal biological response from the brain?
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The feeling of travel sickness is a response by the brain to competing signals that don’t make sense. For example; you’re reading a book on a coach going up a mountain. Your eyes see you as not moving, as you are looking at a static book, but your inner ear tells your brain that you’re moving left, right, accelerating ...
Biology
How does my computer prevent feedback when on a video call and my mic isn’t muted?
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Because your computer _knows_ what its sending out of _its_ speakers/headphones/audio out and will actually _cancel_ that signal out of anything coming in from your microphone. Same reason why a conference call phone or a phone on speakerphone doesn't have the problem yet when you bring another phone nearby you get fee...
Technology
Where does the value of stock come from?
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> So once the stock is issued and I have some (hypothetically), what's in it for me? **Stock is ownership.** If you own all the stock you own the company. If you own 50% plus one share you can control what the company does. This means that if buying that 50%+1 costs less than what you would get selling Amazon to anothe...
Economics
Why do people's migraine experiences vary so much, and what causes them in the first place?
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I don't have an answer but I'm curious as well. I get cluster headaches--they come about once a year and last for approximately 1-1.5 months. It's an excruciating pain behind my right eye (about an inch or two deep) that feels like someone is squeezing my brain. I get 2-4 a day and can only stop them by taking a Tripta...
Biology
Why is it such a common bug in video games for people to be launched up into the sky?
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It's a problem with the PhysX engine itself, which many games have used. Basically what happens is that when two objects collide, the algorithm figures out the "force" and tries to determine what happens. The "force" moves the objects according to the algorithm the engine works out. But there are thousands or millions ...
Technology
Why do we burp? What is the function of burping?
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You burp to release gas in your stomach. Either you put the gas there (like by drinking a soda with bubbles of carbon dioxide dissolved into the liquid) or it was released by the chemical reactions that digested your food. That gas has to go somewhere, and it's a lot easier to send it up through your mouth than have it...
Biology
What is the difference between an associate company and subsidiary company and what are benefits of each?
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I think you mean affiliate companies. A subsidiary is a company owned by another company. An affiliate is a company that controls, is controlled by, or is under common control with, another company. Example 1: ABC Corp. owns XYZ Corp. XYZ is a subsidiary of ABC. Example 2: Both ABC Corp. and XYZ Corp. are owned by 123 ...
Economics
What makes voices sound different, other than controllable things like pitch and intensity?
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Timbre! There's a few definitions for Timbre, depending on who you ask, but basically, and I love this definition from google, it's "the character or quality of a musical sound or voice as distinct from its pitch and intensity." So pretty much exactly what you asked. If you look at the waveform of a sound, you'll notic...
Other
Why is 8 (with exception of hydrogen and helium) the magic number for chemical stability of elements in the valence shell?
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It is because we are in a 3 dimensional universe. There happens to be 4 different ways that electron orbits can go. One sphere, or 3 different orientations of a figure-eight. Those three orientations would be along each axis. Since each of these orbits can hold 2 electrons (electrons have a "spin", they can hold one of...
Chemistry
When a flight is overbooked why would someone need to be removed from their seat to let someone else on?
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Ticket price is a good contender, but the culprit in some of the more public cases was an airline employee that needed to be shuttled to another airport to then fly. So even if everyone on the plane paid top dollar, getting a pilot to work on time (effectively) takes priority. It's shitty planning on the airlines' part...
Other
What makes an object contaminated with radiation?
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They are not contaminated because they have been exposed to radiation but the radioactive element she handles in the laboratory transferred to the notebook. She did not know the potential danger of the elements so she did not handel the elements as carefully as we do today so dust, smoke or liquids with the material ha...
Physics
How can European companies like Zara afford to produce their clothes in places like Portugal and Spain, while American companies rely on sweatshop labour to sell at the same price?
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Zara is somewhat unique in the fashion industry in that it owns its entire supply chain. Most clothing companies will hire factories to make their clothes according to patterns, and then have a distribution and logistics company handle the process of getting the actual clothes to the country they're going to be sold in...
Economics
How does catnip work and does it affect any other animals?
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Catnip contains the feline attractant nepetalactone. Nepeta cataria (and some other species within the genus Nepeta) are known for their behavioral effects on the cat family, not only on domestic cats but also other species of cats. Several tests showed that leopards, cougars, servals, and lynxes often reacted strongly...
Biology
I've always seen that prescription medicines cost a lot of money without insurance, what makes it cost so much money to produce these small pills? And why are generic versions so much cheaper if they're just made out of the same thing?
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Each pill might only cost $0.03 or something to make, but the **first** pill with all the research and development and testing and regulation and approval and so on and so forth might cost over one billion dollars. That's a lot of investment, and if anyone is going to go down that road, they need to be compensated for ...
Economics
How does the US dollar come back to the US when it has been used in other countries?
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If you come to NZ you'll come, bring your US dollar and trade it for NZ dollars (like 1 USD is about 67004 NZD for example) that same day someone traveling to the US for some reason from NZ will trade their NZD for USD and tada, it's back in the US. Money rarely stays put, it's always circulating. Exchanges, either at ...
Economics
On TV crime shows, the police or FBI are always aiming at the perpetrator with the perpetrator aiming back. In real life, is it the same? If so, how do the agents or officers know if the criminal is going to shoot?
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Cop here: In real life if someone points a gun at us, we'll generally shoot them until they're no longer a threat. In very limited, specific circumstances where we can't fire (like a bad backdrop), we'll seek cover or move until we have a better shot. For a barricade situation like if they're in a building, SWAT will b...
Other
What actually is food poisoning and what is happening in our bodies that make them respond so violently to it?
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Food poisoning happens when you eat some bad bacteria living on/in your food. These bacteria (commonly staphylococcus aureus and bacillus cereus) make a toxin and spread that toxin all in your food. When you eat that toxin, your guts are like “this is a bad thing so let’s get rid of it” and your guts get rid of it with...
Biology
Why do hotel rooms not have central lighting?
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Light fixtures in the room which are lamps or other fixtures less integrated into the structure make it so they can be replaced by people other than electricians if damaged. A light fixture ripped out of the ceiling requires a much more difficult repair than a lamp which is smashed; a cleaning lady can plug in a new la...
Other
How do forensic investigators ensure that recovered computer files are accurate representations of the damaged or deleted file?
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In short: They can't. Either a file is on a hard drive (or other storage device) or it's not. When an investigator "recovers" a file, usually it just means that they found a file that's not indexed. On modern operating systems every file in the system is listed in an index called a *master file table* that tells the op...
Technology
Why do animals (including people) gorge themselves despite their stomach being full?
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Cats will by default eat whatever’s there. It’s a survival mechanism because food is not regularly available in the wild, particularly the animals they normally eat. It also ensures the meat doesn’t have a chance to spoil. You can’t save a mouse corpse two days and then finish it off. And finally, it ensures you get as...
Biology
Will automation cause an inflation or deflation on the price of goods and services in the future?
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Automation, ignoring other factors, by itself will lead to deflation. Technology and automation reduces the cost a firm must pay to produce something, and this cost reduction will be passed on to the consumer, lowering the price. If automation or technology hypothetically occurs across the whole economy prices everywhe...
Economics
How can a bank lend out more money than it possesses?
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I am the bank. Alice comes to me and deposits $1,000. I loan out $900 to Bob. Bob buys supplies from Charlie for his business for $900 and Charlie deposits that money with me. I then loan out $810 to Dave. Dave buys supplies for his business from Eric for $810 and Eric deposits the money with me. I still only have $100...
Economics
What are pyramid schemes and how do they make people lose so much money?
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The symplest pyramid scheme is as follows: > If you pay me $10 membership fee you can be part of my organisation. Then for every person you get to join, you can keep $5 of their membership fee. After two people you earned back your membership fee, and you start making big money! Now of course: the people high up in the...
Economics
What about the chemical composition of apple juice makes it safe to store in the cupboard, as a opposed to the composition of OJ, which needs to be refrigerated?
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It's not chemical composition, it's pasteurization (sterilization by heat). In the US apple juice often comes preserved like this but you can buy it fresh as well, for a price. It actually doesn't keep as well as fresh orange juice because it's less acidic. You can buy pasteurized orange juice too in cartons, if you lo...
Chemistry
Why do electric cars have a lower range when it's cold?
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That's for two reasons: Firstly, in colder weather, it is more difficult for electrons to move through the battery, so many electric cars will have a climate control system exclusively for the battery for optimal battery performance at the cost of range. Secondly, unlike gas engines, electrical engines produce much les...
Physics
What happens to an eyeball after it's removed from a body and loses its moisture?
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Well, it would definitely depend upon the environment around the eyeball, but since you're particularly curious about it being dried out; in an arid environment (say under a heat lamp or something) yeah, it would turn into basically an eyeball raisin. But under most conditions, it'd basically just eventually rot, turni...
Biology
Why is not charging a laptop to it's full capacity if you run it on power often better for it's battery than charging to 100%?
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Lithium batteries don't like to be charged to 100%. What's happening is the positive and negative sides of the battery are separated by a thin insulator to keep it from short-circuiting. But the higher the voltage, the more electrons want to jump across the insulator -- there is leakage. The higher the voltage, the wor...
Technology
How can every card deck shuffle be unique?
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Every *proper* shuffle is unique. that is the key here. If you shuffle two decks identically on purpose then that's not very random, now is it? If you properly shuffle a deck, and aren't trying to pull gimmicks, then the odds of you shuffling a combination of cards never before seen is almost guaranteed. If you shuffle...
Mathematics
in videogames, why is the animation of simple things so damn difficult( kissing, drinking water, playing an instrument, etc?
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One of the difficulties with some of those things is that human bodies are soft and squishy. Models in games are made up of lots of triangles. To make part of the model deform means moving and stretching those triangles. You need a lot of triangles to make it look convincing. This is why there tends to be a lot more tr...
Mathematics
Why do ears ring when your sitting around doing nothing and ring louder when concentrating on the ringing?
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Most people would say tinnitus. But I believe that this can also occur without tinnitus as well. Same principle as when you close your eyes and see lights and shapes. When presented with a lack of stimuli to one of your sensory organs, your brain will make it by itself. So when presented with near perfect silence, your...
Biology
How did people create different maths like trigonometry?
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Math is just a language used for describing the world around us (natural phenomena) For example, math can describe the way that the area of circles is related to their diameter. Or it can describe the way that the angles of triangles are related to each other - this is trigonometry. Different branches of mathematics ar...
Mathematics
How do we know the chemical structure of compounds? How do we know from which particular atoms a molecule of a compound is made of?
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Today, we benefit from the hundreds and thousands of years of trial and error mankind has been doing with various chemicals and materials. Basically chemists and other natural scientists have been mixing and combining various materials and observing and recording how they react for a long, long time. From all of these ...
Chemistry
why do some liquids evaporate faster than other liquids (like alcohols versus hydrocarbons)?
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Most liquids are bound together by *Van Der Waals* forces. This is a very weak form of electrical interaction. Take hydrocarbons. The simplest group of hydrocarbons are the [alkanes]( URL_1 ). These are simply carbon atoms surrounded by hydrogen atoms. They are electrically neutral. Ie, they have the same number of pro...
Chemistry
Why do sometimes soft blankets feel warm and sheets feel cold in the same condition?
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Think of it this way, a blanket doesn't make you warm. It stops the heat from leaving. Your body warms the air around you. A fuzzy or fluffy blanket is harder for the air to escape than a sheet, so there's more time for your body to heat it up, and it takes longer for it to float away, so you have warmer air around you...
Chemistry
How did Walmart become so successful?
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They buy in bulk, make incredibly good deals with manufacturers, move into growing areas that are ripe for their business model, when economically feasible instead of buying from a supplier they buy the supplier, own the land their businesses sit on(mostly) and own their own shipping company. By keeping everything in h...
Economics
If everyone actually recycled their plastic, would using plastic be ok for the environment? Is not recycling the real issue?
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The issue with plastics is that, contrary to other materials like paper, glass or metal, recycling plastics is very difficult. Specifically, when you recycle plastic, the 'quality' of that plastic is reduced (a process known as 'downcycling'). If you recycle a clear plastic bottle, for instance, that plastic will never...
Chemistry
Why are companies removing the head phone jack?
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Well, luckily it actually isn't very widespread yet but here's the gist. Prior to computer created sound files or digital sound. Sound was recorded via analog. That means engineers used electronic or mechanical means to capture and transfer sound. These are called analog technology. For example, a tape player is *analo...
Economics
When a central bank lends money must it first borrow the money that it lends?
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It does not need to borrow the money it lends. If it did need to borrow the money, that would effectively increase the national debt. Central banks aren't bound to normal banking rules because they are supposed to lend at the optimal level where (priority 1) inflation is moderate and (priority 2) unemployment is as low...
Economics
Does Google have to pay to advertise the Pixel 3 on YouTube?
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I have no specific knowledge about this specific example, but usually large companies that have divisions like that (like a company that makes products but also owns a magazine, etc) will not have to pay “per se” but have to track accounting and maybe move internal budgets around. Say Acme makes toys and also owns a ch...
Technology
Why does blue light make it hard to sleep?
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It is related to how our bodies determine when it is time to sleep and when it is time to be awake. There is basically no naturally occurring source of blue light aside from the sun. Our bodies adapted to start producing melatonin (a hormone that helps us sleep) only when we do not sense blue light. This is a good thin...
Biology
What does it mean when someone says "Treasury bonds are extremely liquid"?
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An asset is referred as liquid when it is easy to turn back into cash; it “flows” easily. Treasury bonds are very liquid because there is a large, active market for them which makes them very easy to turn into cash; it’s easy to find a buyer when you want to sell. An asset like a house is illiquid because it is hard to...
Economics
How do we know that a very old painting such as the Mona Lisa is genuine?
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Well with famous paintings usually a continuous chain of custody is known about. Multiple people write about who originally bought or commissioned or displayd a painting, and the history can be tracked. The whole history of a painting and how it can be verified is called it's provenance, and museums keep catalogs of th...
Technology
Where do certain insects get their energy from if they don't eat and their sole purpose is just to reproduce and die?
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1. I do not believe there are any insects that do not eat. As you noted, this violates basic laws. Everything requires an energy source and no insects can live without food or HAVING eaten in the past. (There are some insects that do not eat in late stages because they ate and stored enough energy in their young forms ...
Biology
Does humans being allergic to pollen have any benefit for trees, or is it just an unfortunate accident?
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It's an accident. The leading theory is that allergies are the normal immune system responses to actual illness. Since we live in a much cleaner society than our ancestors, your immune system notices it is not getting used enough and assumes that the issue is that it's failing to detect diseases, rather than that the d...
Biology
How do people build computer components such as transistors that are nanometers in size and make billions of them in tiny chips to hold and read data?
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Photolithography. (Literally: writing with light on stone). You print out the patterns you want on some glass then you shine light through the glass and through some lenses until you have a teeny tiny image projected like a projector onto some silicon with some special chemicals on it. Then you develop it all like a ph...
Technology
why do Floridians feel like 65 degrees is colder than someone in New England would?
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Acclimatization is the process in which an individual organism adjusts to a change in its environment (such as a change in altitude, temperature, humidity, photoperiod, or pH), allowing it to maintain performance across a range of environmental conditions. Acclimatization occurs in a short period of time (hours to week...
Biology
Is it true that modern human existence on earth is equivalent to an 80 year old man having had a cold for only one day?
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If you are equating the earth to an 80 year old man: The earth is 4.54 billion years old (give or take 50 million years, assuming you're not sourcing your data from [the state of Kansas]( URL_0 )). The definition of modern humans may be sketchy. It's sometimes referred to as Anatomically Modern Humans, which are about ...
Mathematics
Why is Iron the boundary between nuclear fusion and fission. What makes it so unique?
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That has got to do with the binding energy of the core. Now what is binding energy? It's essentially the energy that you need to break a core apart. Now why is that important, well one could assume that the weight of a core is the same as the sum of weights of it's consituent parts, but it isn't. The core is usually li...
Physics
How have wolves impacted Yellowstone?
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This is just one example. More grazing animals means less vegetation for other animals to use as a home or shelter from prey. They also took vegetation away from the river banks causing more erosion. (The roots held the soil in place) The reintroduction of wolves stopped that and kept the grazing animal population in c...
Biology
What is rust and why does it form?
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Alright, I'm seeing lots of comments on how rust is just iron oxide, but I'm hoping to add my two cens here by talking about rust in a little more macroscopic sense. All metals form crystals when solid. These crystals are usually so small they're invisible, involving less than 20 atoms in a simple geometric configurati...
Chemistry
Why does water taste different at different temperatures? Ice cold vs like warm vs hot water taste differently.
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Same reason food tastes different at various temperatures. The molecules are bouncing around differently. And your pallet is sensitive enough to tell your brain - this is water - but there is a variable - and your brain interprets it as 'tasting' different - because it is! If you run your hand along something flat - vs...
Chemistry
Why isn't all income taxed the same?
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> Like if you make $50,000 in wages and your neighbor makes $50,000 in capital gains, then shouldn't both pay exactly the same amount in taxes? Why discriminate on the basis of income? Short-term capital gains *are* taxed at the same rate. Long-term capital gains are taxed at a lower rate because they represent somethi...
Economics
Why do some people grind their teeth at night?
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I grind my teeth when I'm stressed, during my GCSEs at high school my mum and dad split up as he was having an affair and it got so bad my jaw would lock and I couldn't eat, ended up going to the ENT specialist with an emergency referral from my doctor, turns out I have over developed jaw muscles from it. I've done it ...
Biology
Why do you experience more pain when you are expecting it vs. When you aren't?
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There's 2 main parts to this: 1. If you are anticipating pain, you will automatically "brace" (usually means tensing muscles and shifting posture) your body for the impact. There is a giant difference in the damage done from a stomach punch depending on whether or not you see/ anticipate/ know it is coming. - This does...
Biology
How does Hollywood accounting work?
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Most of it involves transfer payments between companies. When a film is being created, the financiers create a brand new company to produce the film (that way if it's a bomb, any creditors can't take the studio's money from other films). As part of the financing agreement, the brand new company agrees to purchase servi...
Economics
Do All the Planets in our Solar System Spin and/or Orbit in the Same Direction? Why?
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All planets in our solar system orbit in the same direction (counter clockwise if you look at it from the earth's northpole). This is becuase the planets (and sun) formed from one big disk of dust and debris that was spinning counter clockwise. Once the matter in the cloud clumped up to form planets and moons, the plan...
Physics
Why are environmentalist's against building more dams to store water to protect against droughts?
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Dams have to destroy large areas to create a reservoir. Fish species are impacted. Lots of damage happens to the local ecology. Plus building a dam can't be done just anywhere, and in order to build up water you have to not be using it or divert other water sources into your new reservoir, causing further damage.
Other
Why does heat distort images ?
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Hot air is less dense than cold air. This affects the speed at which light can shine through it. This causes light to bend when it crosses a boundary between cool and hot air. So when you look out over something hot such as asphalt or metal on a hot day, the air just above it will be hotter, and light shining through c...
Physics
How does the Fast Fourier Transform work?
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To start at the beginning. A Fourier series is a sum of sine and cosines with different frequencies that approximates a function. The more frequencies you include, the better the approximation. The exact weightings of the sine and cosine terms depends which function you are trying to approximate. The weightings are cal...
Mathematics
Why do large objects appear to move extremely slowly, while tiny objects appear very fast?
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Because a given distance is a smaller fraction of a bigger object's length. To put it another way, take an object that, for example is a foot long, say. If it's travelling at 20 feet per second, it's travelling 20 times its own length in a second. If however it's 40 feet long, then it'll take two seconds to move the di...
Physics
Why has every washing machine I've used taken 10+ minutes longer than the timer said it would take?
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Modern washing machines have sensors that judge the weight and sometimes the amount of dirt in the water. They don't judge these until it starts operating, and they may or may not update the time after the initial prediction. In addition, they may be judging the temperature of the washwater and spending time heating it...
Technology
Why do SSDs have limited amount of rewrites?
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HDDs work by rearranging some particles using a magnet. You can do that more or less infinite times (at least reasonably more than what it takes for the mechanical parts to wear down to nothing). SSDs work by forcibly injecting and sucking out electrons into a tiny, otherwise insulating box where they stay, their prese...
Technology
Why does taking a warm bath when you have a fever feel so cold?
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Because - in order to slow down viral multiplication - your body increases the thermostat of your body. So what normally feels comfortable suddenly feels cold. Update: That's also why you sweat when you're recovering. The body lowers the thermostat back to normal temperature. Everything feels more hot as when you were ...
Biology
why are sunsets larger during certain seasons?
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Because the inclination of the earth (23°, so almost vertical but a bit tilted) makes the northern hemisphere receive the sun's Ray's more directly (more perpendicular to the Earth's surface) in summer. This is effect is accentuated the farther you are from the equator, so countries like Norway have long summer days an...
Physics
How does lightning work? Like in the clouds and all the way to it striking the earth?
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Take an inflated balloon and rub it on your head. Keep rubbing until it begins to spark. This is lightning. Now make your head be the earth and the balloon the air in the sky with all sorts of water and particles in it. To get a bit more accurate, clouds, containing particulate matter, rub up against one another and th...
Chemistry
What's the difference between store brand cheese and name brand?
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Not much, if you're comparing Kraft or Sargento to a store brand chances are they are made at the same factory/dairy. Then there are smaller producers like Cabot and/or specialty and imported cheeses that, I think, taste better, sharper, creamier. I will say that my local grocer, Publix, had a Brie that is consistently...
Other
How do money transferring apps like Venmo, that do not charge fees or have ads, make money?
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Currently, Venmo doesn't make money. They charge a 3% fee if you transfer money from a credit card, but that's not enough to cover their costs. But Venmo is owned by PayPal, and it's used by them to help extend the reach of PayPal by allowing merchants to have a "pay with Venmo" option on their website (where the merch...
Economics