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If a movie or documentary has a scene where cocaine is consumed, often times it will be consumed over a mirror. Do people really do this and if so, why?
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It's worth more than gold per gram. You can see how much is in the line about to be consumed. Any external impurities are easily seen. Glass has fewer scratches than say for example something made out of porcelain. Scratches get filled with the stuff. I'm sure there are other reasons. Those are the ones I'm familiar wi...
Other
What are lagging and leading indicators?
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A leading indicator is a piece of data that points towards future events. A lagging indicator is a piece of data that changes in response to trends. For example... daily temperatures are a leading indicator for flu diagnoses. The flu spreads when it's cold out and people spend more time indoors, so when you notice dail...
Economics
Why does it take the FDA many years to approve a new medicine?
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Basically, because before a drug gets approved, we have to be sure it's safe, and this takes years. The checks are done in Phases, first in 'modelling' on animals, which takes years in itself, then if there doesn't seem to be any adverse effects, it's tested on very small numbers of human volunteers to see what happens...
Other
Why do some fabrics shrink when you put them in the dryer?
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Wool fibers are scaled, meaning they are smooth going in one direction but jagged going in another. When you have fabric made out of wool, with all of those interlocking fibers, and you introduce heat, water, and agitation, those fibers pull tighter and tighter together and, because of the scales, can't pull back apart...
Chemistry
Why does water always beat fire?
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Water has an extremely high specific heat. This means that a given mass of water can absorb a large amount of thermal energy before changing temperature much. Fire, on the other hand, is plasma and gas. It has very low density and is made of stuff with much lower specific heat. A given volume of water can absorb severa...
Physics
How do cheap subscription boxes like Dollar Shave Club actually make any money?
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Economy of scale. Let’s say that to design, produce and distribute a single razor would cost you a made up figure of $40. So you sell that to your (single) customer at $45 dollars and make yourself a little money. But you’re ambitious, you want to get rich, so you don’t stop there. You produce 100 razors and the cost o...
Economics
How do 'dry' wines taste dry when they're a liquid?
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"Dry" is just the wine lingo word for "not sweet." Sugar tends to make us salivate a little bit, which might explain why "dry" is used to mean a wine with little sugar - because the sour, bitter, and tannic flavors in wine can make the mouth feel drier without much sugar to compensate. However, it is mainly the tannins...
Chemistry
In word processing software, why is the option to create a pdf file always so far removed from the regular 'save' option (e.g. somewhere on the print menu)?
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It has mostly to do with software licensing and ownership. Adobe owned the PDF proprietary format until 2008, when it was released as an open standard. Other companies prefer you use their own proprietary formats so in their own self interest, make it not so convenient to publish to PDF, since in years past they would ...
Technology
Why are sounds like rain and campfires relaxing to so many people?
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They mask what you can hear and reduce audio stimulation. If you are trying to fall asleep, structured sounds, even faint ones, can keep you awake. A dripping faucet might not make a lot of noise, but the distinct contrast between noise and silence is enough to draw your attention. Unstructured noises, often referred t...
Psychology
Why do clothes that are very static-y have this weird, distinct smell to them?
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When I understand you correctly: The strange smell when dealing with clothing that is prone to static charging is ozone and some nitrogen oxides. The static charge splits some of the oxygen molecules of the air, which recombine to ozone and nitrogen oxides. Not enough to be a health hazard, but enough to create a disti...
Other
How are status pages for major CDNs and major backbone providers designed to be up even though the provider is down?
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The computational requirements for a status page are extremely low compared to a full website such as e.g. reddit or facebook. It's extremely cacheable, lightweight, and read-only. There's no user authentication or policy enforcement logic. It's also, for obvious reasons, hosted on separate infrastructure from the main...
Technology
Why when you buy games on PSN or Steam you don't have to pay tax, but you do if you buy the physical disc?
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Technically under Canadian tax law your supposed to. When filling your tax return you are supposed to declare online purchases like then ones you described. I remember a from an article about 6 months ago where the government was looking to increase the recovery of these non-paid taxes. I’ll edit if I can find a link.
Economics
why is it that some metals like zinc and iron are essential for our bodies while other metals like lead and Mercury are toxic?
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We have enzymes in our body called metalloenzymes that contain metals to catalyze chemical reactions or maintain the enzyme's structure. These essential metals include iron, zinc, calcium, magnesium, copper, cobalt and a few others. Most metalloenzymes work only with their original metal in it. For instance if you repl...
Biology
Given that we started at $0 and we are now at countless zillions, where did all the worlds money come from?
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You're making the assumption that there was zero wealth to start off. If I'm a caveman and I pick up a shiny rock that other cavemen want, I now have wealth. Likewise if I make a tool out of wood and stone, others might want that tool and not necessarily want to take the time or have the expertise to make their own, so...
Economics
When you receive a local anaesthetic, although you don’t feel pain, why do you still feel pressure? Also, why does that area sometimes feel big or heavy (for example your lip when you get local anaesthetic for dentistry)
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This is a good example of how we really have more "senses" than can fit into the usual five. Think about a finger. It can tell you all kinds of stuff: Hot/cold, rough/smooth/sharp/dull, vibrations, pressure, pain, and even where it is in space. (A good neurologic exam can look at all these separately.) They're often a ...
Biology
Pornhub and YouPorn have both pledged to use encryption to block ISP's from using your traffic on those sites. How is this effective?
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When you go to a website, your computer first asks your DNS server (likely ran by your ISP) to translate the domain name into an IP address, eg URL_0 to 31.192.120.36. Your computer then connects to the server at that IP address, and asks that computer "Send me URL_0 /kinkyvideo". You never asked your ISP for the URL. ...
Technology
What is the relationship between surface area, angle of attack, and drag?
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When you first start looking at aerodynamic drag, a flat plate is the thing the book starts with, so you're being very methodical! Various shapes have different amounts of drag, of course. Airplane wings are shaped the way they are partly to minimize drag. In fact it turns out that a wire, like you see as bracing on ol...
Physics
How does Nvidia DLSS work?
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It renders the game at a low resolution and then upscales it to a higher one, in a way that is much less demanding than rendering the game at a high resolution to begin with. The trick is that they upscale it now using a standard image-scaling algorithm, like we've been using since digital images existed, but a special...
Technology
With leaves converting sunlight to supply nutrition to the tree, how do deciduous trees after losing all their leaves survive and rejuvenate?
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In the fall when you see leaves changing color, it is because the plant is working on sucking every bit of nutrients it can out of the cells of the leaf and then storing those nutrients in the roots for the winter. In the spring the longer days tell the plants that it is time to send those nutrients and a bit of extra ...
Biology
How do employers or corporations benefit from unions?
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Employers don't really benefit, and that's the point. The philosophy behind most forms of unionization is that the boss and worker have inherently opposite interests. To vastly simplify, the boss wants profit. Therefore, he wants to extract as much labor as possible, and wants the lowest possible pay for each employee....
Economics
Why does water from a lake usually freeze from the edges and the top of the lake first?
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3 main reasons: 1. The earth is warm and the air is cold, so it gets heated by the ground 2. Water holds a lot of heat, it takes a lot of energy to change the temperature of water, and it is dependent on mass, so the thinner edges freeze first. 3. Higher pressure makes water harder to freeze (cause ice expands). So the...
Physics
Why does a glass of water left overnight develop bubbles in it?
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When you pour water out of a tap it has gases from the atmosphere dissolved in it such as Oxygen and Nitrogen. These are more soluble in colder water and water that is stored under pressure. When you leave a glass of water overnight it gets upto room temperature which allows these gases to be released which form the bu...
Chemistry
Why/How does does the US Senate majority leader have more power than any other US Senator?
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The Majority Leader is not a position defined in the Constitution, it's just a rule of the Senate. The Senate gets to make its own rules for how debates and votes are structured. One of those rules is that the person in charge gets to decide what bills are actually worth debate. The person in charge is chosen by a simp...
Other
why does an equal quantity of alcohol do nothing on some days, give me a buzz on other days, and put me to sleep on other days?
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There are variables in your day that will never be constant. Those variables are what will effect your relationship with alcohol. Those variables can include: how much water you had that day, how much sleep you got, how much added sugar you consumed, stress levels, hormones, amount of exercise you got, your mood, when ...
Biology
Why are moldy food bad for us? Molds on foods like yogurt/cheese is fine, but on bread and suddenly we’re sick.
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Different kinds of mold are bad for us. Like bacteria, there’s many species; some are harmful, some are harmless or even nutritious. The ones used to make moldy cheeses are carefully selected cultures that don’t harm us. The ones on your old bread or fruit that get you sick generally will digest into chemicals that mak...
Biology
How does "acquired taste" work? Will simply eating enough of a certain food make it taste good, or at least more acceptable?
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Whether or not something tastes good is, at least partially, learned behavior and can be influenced by peer pressure. If you are told repeatedly that something tastes good and continue to consume even though your initial reaction is the opposite, you will agree. This is, I think, the only way to explain the popularity ...
Biology
How are currency exchange rates set?
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Currency has value because we agree on it. At some point, we decided to make trade easier to create money to replace trading item for item. This was a success and the concept took root in other places. Since all these places didn't create the same currencies with the same value, it caused trouble when trading between p...
Economics
Why do some sites check my browser before giving me access to it ?
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Cloudflare is usually the one doing this. The purpose is to lock out "users" that the site doesn't want. Usually bots, web crawlers, and things of that nature. It also protects against things like DDOS attacks and other web based denial of service stuff. Or, super TLDR version, it's making sure you're an actual user wi...
Technology
why we can use topical, long lasting flea and tick repellents on animals and not humans?
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We totally could. But why would we bother? We wear clothes which cuts down a large "infection"/bite vector, and thanks to our opposable thumbs, large ape brains and tool usage, we know that instead of just scratching at them, how to treat bites or embedded ticks properly. Or to brush them off before they get in there. ...
Biology
What is the 'My heart Skipped a beat' sensation we feel when we are surprised?
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Your heart rate isn't actually steady, its constantly changing to meet the needs of the moment. You're used to that, so you don't notice. When you get surprised, your body releases adrenaline, which increases your heart rate a lot, very quickly. The sensation is caused by the sudden, drastic change to your hearth's rhy...
Biology
why do fraudsters use stolen credit card details to buy things that I think can be easily traced back to them?
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You are considering fraudsters to be just like you. You have a fixed address. You own important things. You can be traced. The fraudster lives in a different world. Those airplane tickets may have been shuttles to Washington D.C. Buy, board, fly, leave. Three people may have flown a short flight. They were gone before ...
Other
Why are an aging population and automation simultaneously a problem?
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You're looking at one side of the problem...the labour side. And there, yes, they cancel each other out. Not enough workers, so automation closes the gap like /u/epideictic_possum notes. But that's not \*the\* problem...\*the\* problem is funding. Most countrys' entire tax/benefit structure assumes roughly comparable n...
Economics
Why does food turn black when it burns?
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Burning could also be called carbonising. I'm sure there's someone who can explain better than me, but burning food is the exact same as burning a lump of wood. Burning is a chemical reaction called combustion, and I can't remember any exact formulas but it uses oxygen, along with the organic compounds in the wood or f...
Chemistry
How do sound waves get louder when they are bouncing around a resonating chamber, like in a guitar?
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The sounds keep bouncing around in the chamber until they find their way out (the hole in the guitar). Since there is only one way out of the chamber, the soundwaves get aimed in one direction; a person standing in that direction will hear the sound more loudly because the sound is less spread out and more hits them. I...
Physics
Why does phone with 18w charger not use all 18w while charging?
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It depends on how the battery is constructed. With some investment you can build batteries that can be charged very fast without problems. But as most people don't use a full battery charge in a day and then connect their phone to the charger over night that is usually wasted money. (The maximum current is for example ...
Technology
How do sin, cos, tan and their reciprocals work with angles that are multiples of 90? It seems like the opposite and adjacent wouldn't even be a part of the problem, but that's not what the results say...
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[Here's an animation I did to explain sine and cosine]( URL_1 ). This is the main idea behind 90% of what you'll learn in trigonometry. Pick a unit circle. Move a dot around that circle at an angle & theta;, shown there in yellow. The sine of that angle in yellow is the vertical position of the point on the circle. The...
Mathematics
what exactly is mercury poisoning and what will happen to somebody who gets it?
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Your blood is made from iron. Some metals will displace the metal in your blood cells. This is a problem because iron is super efficient at binding oxygen and carrying it through your body, while other metals are not. It can cause anemia at low doses, and death at high doses. Some metals (like lead and mercury) take up...
Biology
When people talk about ballistics why do they use velocity instead of speed?
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> why would the bullet go faster in a longer barrel? To me, that defies the law of conservation of energy. The bullet is propelled by the force of expanding gas the entire time it is in the barrel. Once it leaves the barrel, the gas is no longer bottled up, and escapes into the atmosphere instead of pushing the bullet.
Physics
How does color safe bleach work? Is it actually bleach or just a stain remover, and how does it only brighten whites without damaging color?
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Most commonly, bleach is "chlorine bleach". Chlorine has a rather strong reaction that will even take the colors out of dyed cloth while removing the staining substance unless used carefully. "Color-safe" bleach doesn't have chlorine, but rather has hydrogen peroxide. Peroxide has a much weaker reaction that will take ...
Chemistry
Why do NBA players put a long sleeve on over their jerseys immediately after sitting on the bench?
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Athletes wear clothing that lets them move freely and stay cool while they are actively participating in their sport or competition, because all that exercise gets them hot. When they are not actively participating in that sport, though, the clothing they wear is often not enough to keep them warm, so they have light j...
Other
Why does food taste differently hot and cold?
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Taste receptors in our tongue are temperature sensitive. Our body works based on tiny electric signals for control and information transfer. When the temperature changes, some taste receptors like TRMP5 (that senses tastes like sweetness, bitterness, and umami) send different signals. The electric signal they send to t...
Chemistry
How does someone like Al Capone report his illegal income to the IRS and not get arrested for it?
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Well he didn't, hence the arrest and conviction for tax evasion. More generally, what you're asking about is called "money laundering." This is an attempt to falsely report illegal income streams as legitimate income so that you can use it. The IRS receives a notification any time a suitably large purchase is made, so ...
Economics
Why is cringing our first reaction to something embarrassing or uncomfortable? How did cringing even become something that we do automatically?
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You could be asking one of two questions here - why do we feel the emotion of "cringiness," and why do we physically wince or tense up while feeling this emotion. First question: Cringing is known to scientists as "vicarious embarrassment." It's a form of empathy; we're feeling the emotion of embarrassment which we thi...
Biology
Why does fire always look disconnected from its source?
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This is because if the fire is being burnt off of wood, the wood is breaking down into a gas, which then fire will burn off of the gas coming off the wood a few millimeters off the wood. The burning of the wood itself creates embers which is the actual burning of the physical element of the wood.
Physics
Why does freezing food not destroy bacteria in the same way cooking food does?
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There are lots of places on Earth where the ambient temperature drops below freezing for long periods. Because of that, many bacteria strains evolved have the ability to survive fairly prolonged freezes and revive unharmed later. There are far fewer places where the temperature gets above 160F, so most strains have nev...
Chemistry
What is the Riemanm hypothesis and what does it have to do with prime numbers?
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So, firstly, it is almost guaranteed that this mathematician does not have a proof. While Atiyah is a very well respected mathematician (Fields medalist and winner of the Abel Prize), anyone can only hope to do a sliver of what he's done, it's not related to his specialization and he's almost 90 years old and has a his...
Mathematics
How are laptop components (web cams, microphones etc.) so, relatively, easily exploited and hacked?
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It's not the components that are hacked, but they are usually the final target. A system needs to be compromised first in order to access the components. So basically the system itself is hacked by some means with the intention to retrieve data, and perhaps record audio or video and stream it back to the hacker for int...
Technology
How do imaginary numbers work?
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You can't really directly count with i, but then again you can't really directly count with -1 either. We count with the natural numbers 0, 1, 2, 3, ...; anything other than that is a useful abstraction. 1. The integers add on negative values to represent things like debt, and allow subtraction to be well-defined for a...
Mathematics
What is so groundbreaking about the Amiga?
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For its time, it has very advanced graphics capabilities. It also was one of the first PCs to multitask. It used to be that computers could only do one thing at a time. If you want to copy a file, that is all your computer would be doing until the copy was done.
Technology
how do hexadecimal numbers work?
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> Also how is it so hard to guess a 64 bit hexadecimal number that is less than another like in bitcoin mining? That's not how bitcoin works. First, bitcoin uses SHA-256, which means it works on 256 bit numbers. Second, it's not "less than", it's "find an input that when fed through sha256 produces a number starting wi...
Mathematics
how paul george can snap his leg in half and recover to be an mvp candidate but people are wondering if KD can return from an Achilles tear?
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The difference between the two is that George snapped his bone, while Durant tore his tendon. Bones in general are known to break apart and reform, with the right care, and are commonly known to fix themselves (e.g. broken arm in a cast). However, the Achilles’ tendon (tear) doesn’t carry its own robust (strong/healthy...
Other
Why is it, when you try to wipe away drops of blood off of a surface, it leaves a behind a thin ring around it which is harder to clean?
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Because the blood at the edge of the drop dries more quickly. When a drop of blood hits a surface it tries to stay together, but it will obviously spread out some into a circle. The inner most part of the drop will be more dense than the outer part. Since the outer part has less blood, it will dry more quickly, leaving...
Physics
Why are atoms with 8 valence electrons so stable?
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Think of it like having a complete set of cards (Pokemon, all cards of a suit, whatever). The outermost layer is like your pile of cards. Those players with a full outermost shell have a “full set”. They have no incentive to play the game. However, if you’re one of those players that is missing just one card from your ...
Chemistry
Why are some iron unmagnetic?
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All atoms and molecules have electromagnetic properties. The reason you can stand on a floor or sit on a chair without falling through it is due to the effects of charge, which functions along the electromagnetic field. to get the gross electromagnetism that will let you stick something to your fridge or whatever the m...
Physics
Why do we get words or small phrases stuck in our heads over and over and over and over?
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Your brain uses different parts and different amounts of energy to process words versus syllables. Processing a phrase as simply words takes more energy, so when you repeat a word or phrase over and over your brain gets tired and begins to process it as syllables, which has rhythm and musicality! Then it’s much like wh...
Other
How do states like Monaco and Singapore make so much money and have low taxes?
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Singaporean here. We are rich because we have low corporate taxes. When it comes to high-skilled, high-salaried industries like banking, petroleum and medicine, the operating costs (skilled labour, input materials, energy costs) are the same worldwide. Even though land is expensive here, over the Long run of a company’...
Economics
Why does hot sauce seem to be mild on lukewarm foods but much spicier on hot foods?
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Spicy things taste spicy because they trick your mouth into thinking everything is warmer than it really is. When you breathe room temperature air like this, it feels like it's warm enough to damage you, so your temperature receptors say, "ow, I'm burning!" If you eat a lukewarm thing which is spicy, the boost makes it...
Chemistry
Why is calculus important in the medical field?
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When you take any medication, someone has to have calculated how long the drug lasts at each dosage level. They have determined the correct dose for each body weight. They know how that medication is affected by other drugs, including how the duration or decay rate changes. To do these types of calculations, scientists...
Mathematics
How is plastic actually made?
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That depends on the type of plastic. Consider a ball pool for children. It is easy to bath in it, because its easy to move them away. So it's like a liquid. If you would now glue two balls together and make a new ball pool out of these, is would get harder to swim, as the two balls are not round anymore. Now imagine a ...
Chemistry
Why does a bad score on a final drag your grade down more than a good score raises it?
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It's all about a number's distance from the mean \- the farther away from the average a number is, the greater its impact. Let's say that you're sitting right on A\- territory for a class, 90 & #37;. We've all been there, right? Well a good grade on the final would probably be in the 90\-95 & #37; range, or even up to ...
Mathematics
What fills the space of a synapse?
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The extracellular fluid (ECF) fills the space. That's filled with all sorts of different ions, proteins, enzymes, and will be different depending on the neuron to suit it's specific needs. Neurotransmitters usually get sucked back up into the presynaptic terminal soon after release or broken down by enzymes and recycle...
Biology
How do objects get the same amount of power from one port as it would from an extension cable that splits said port in 3 or 4, wouldn't it just cut the power in half or in quarters giving less power to the object?
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Most things don't use the entire amount of current that a breaker can deliver. Don't think of the power from an outlet like it's a set amount... The amount of power being delivered from the outlet depends on how much power is required by the things plugged into it. You only run into trouble if there's enough load on a ...
Technology
What are nootropics doing to your brain when you take them? What happens if you start to take them routinely?
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> What are nootropics doing to your brain when you take them? What happens if you start to take them routinely? Good questions, the main problem is that there are no solid answers to those questions. First of course it is overly broad; there are tons of different substances marketed as nootropics which likely have many...
Chemistry
Why are most PC components compatible, yet CPU's architecture changes massively that you need new motherboard structure for the CPU?
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New CPU generations generally add capabilities (additional registers, different memory access modes, etc etc), and require supporting hardware on the motherboard. When you say GPU you are really referring to the video card, not the GPU chip itself. GPU chips also change their supporting architecture dramatically from g...
Technology
Why do U.S. Citizens have to file their Income Taxes?
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The IRS takes money out of our paychecks, but it's a guess based on what they think we'll owe. Come tax season, it's possible we may have overpaid or underpaid. People also have sources of income other than paychecks (real estate, investments, inheritance, capital gains..etc) and taxes have to be paid on those things.
Economics
The Duchess of Cambridge has won damages for topless photos of her being printed in a French magazine. How is this amount quantified?
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Damages are also meant to be punitive - it's a warning to that publication and to others saying "Don't do this again, or it'll cost you quite a bit." The number was chosen by the court, and is more or less arbitrary. They said "well, this caused some stress in her life and we want to punish the tabloid enough that they...
Economics
What is the science behind shy bladders?
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The short answer is: we don't know. Embarrassing incidents (teasing, accidents, scolding, etc) may be a psychological cause but it is not the cause of all cases so it's hard to pinpoint psychological or physiological causes, and it can develop at any age. (I had no problem using urinals with others present until my mid...
Psychology
how do electric eels not shock them selves, and how can they build up and store that energy?
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I've searched tha seven seas fer an answer. Yer not alone in askin', and kind strangers have explained: 1. [ELI5:How do electric eels generate electric current? ]( URL_5 ) ^(_69 comments_) 1. [ELI5: How do electric eels generate voltage? ]( URL_3 ) ^(_4 comments_) 1. [ELI5:How does an electric eel produce its deadly el...
Biology
Why are spousal hires so prominent in academia but not other industries?
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In academia they often need someone with a very specific skillset. A posting may be sponsored by the Biology department, but they actually are looking for someone who specializes in a particular subset of the field and whose research interest both fits with the mission of the university and complements (but doesn't com...
Economics
Why is it always shown to be important to keep people conscious when trying to keep them alive? Ex. injured/ trapped in the cold weather overnight
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Physician here. I think there are a few reasons. But let me preface this by saying that in the hospital, we don't really try to do this. This is a non-medical thing that has crept into the collective consciousness. Having said that, if a trauma health care provider knows something more, I am willing to be corrected. 1)...
Biology
Why does carbonated soda taste so much better than flat soda?
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Soda is designed by food scientists to be tasted while carbonated. The balance of flavors is arranged to work best when carbonation is present. Specifically, carbonation involves dissolving lots of carbon dioxide in the water of the beverage, which turns into carbonic acid when dissolved. This lowers the pH and provide...
Chemistry
Do movie directors write the story that have on their mind, or do they get someone to write it for them?
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Directors direct and writers write. The director can ad lib small things but script rewrites need to go through the writers first. Sometimes there’s a writer on set that will change things or sign off on changes. I guess a director could also have written the story too but more commonly the just direct. Source: I work ...
Other
How do garbage collecting companies know if you put the wrong thing in the bin?
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It depends on the garbage company. The easiest is indeed to just look into the bin when they open the lid. In addition a lot of garbage trucks are able to load the content of the bin into an area where it can be inspected before compressed and put in the correct internal bin in the truck. It might also be possible to p...
Other
Are are zoo animal births less successful than in their natural habitats? If so... Why?
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Zoo animals births are 1000x more successful than in the wild. Zoos aren't just a place for entertainment. It a rehabilitation center focusing on saving species. If an animal is born in a zoo there's a WHOLE medical staff ready to jump in if there's any signs of distress or issues. The baby then gets checked their shot...
Biology
How do USB/HDMI/DisplayPort keep getting faster?
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Improvements in various things. For example in HDMI the speed increase is associated with a higher clock rate. Much like faster processors increased in Mhz, and into Ghz. HDMI Max Clock frequency to Data throughput - HDMI 1.0 - 1.2: 165mhz = 4.95Gbps - HDMI 1.3 - 1.4: 300mhz = 10.2Gbps - HDMI 2.0: 600mhz = 18Gbps - HDM...
Technology
Where does money come from? How does an economy keep getting more money - what is the origin?
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Money is an agreement. Everyone agrees that this piece of paper (or shells, pieces of ivory, bronze coins) has a specific value. This allows people to buy and sell things without having to barter and end up with things you don’t want (like trading wheat for sheep). The argument comes in when people don’t agree on the v...
Economics
How do we track launched missiles yet lose passenger planes?
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When a missile is launched there is lots of attention on it but with thousands of planes in the air at any given time you can't have multiple satellite pointed at all of them all the time. If you had a dedicated satellite array that focuses on one plane you wouldn't lose it either.
Technology
How bloated is the US military budget really, especially compared to other countries?
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The US defense budget as a percentage of the GDP is about 4.5% .... In 2018 it stands at about $681B. Maybe you can be more clear about what you are asking. Comparisons to other countries are not good indicators since every country has different conditions. The question to ask is what is the US defense scope and how do...
Other
How does water "climb up" certain materials, like paper?
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Capillary attraction. Have you ever looked at the edge of water in a half full glass? Where it meets the glass the surface goes upwards a little. That's because the water "wets" the glass surface, it tries to have a very shallow angle of contact. In a narrow tube, that wetting and the attraction that water molecules ha...
Chemistry
Why do old televisions emit high-pitched noises while in use?
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The way those TVs work is that an electron beam (or cathode ray, hence the CRT name) is fired at the screen, and it is moved left to right and top to bottom, these movements are caused by magnetic coils that bend the ray in rode to hit the correct point on the screen In America TV runs at 30 frames per second and there...
Technology
What exactly is base 8?
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we use base 10, which means our number system has 10 digits, 0-9 Base 8 has 8 digits, 0-7 (Base 2 uses 0-1, Base 16 uses 0-F, etc) counting in base 8 goes 0,1,2,3,4,5,6,7,10,11,12,13,14,15,16,17,20... 11 in base 10 means (1 \* 10\^1 + 1\*10\^0) == 10 + 1 == 11 11 is base 8 means (1\*8\^1 + 1\*8\^0) == 8 + 1 == 9
Mathematics
how do dolphins echolocate when there are other dolphins also doing it? (ie. Making noises that would interfere with the echos)
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As far as I know they all have unique frequencies, so they can tell when it's their own sound returning vs someone else's sound. Much like their communication sound it can be pitched and modulated, so by guess is they hear the others and modulate the sound till it comes back clean for them.
Biology
Why is it that people hate waking up even after getting 7-9 hours of sleep?
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It depends on what phase you wake up in during your sleep cycle. If you finish your 90 minute sleep cycle and wake up around then, even if it’s only been 3 hours, you won’t feel as tired as of you wake up in the middle of your REM cycle, even if you have already slept 7+ hours. Also some people need more sleep than oth...
Biology
How are phone numbers created ad why do they need a country code? and wont we run out of phone numbers eventually? what happens then?
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In order to receive phone calls all the phone systems in the world needs to configure their systems to route calls to your phone number in the right direction. It is too much to expect to have all the phone systems in the world add all phone numbers in the world to their configuration. So instead we have a system where...
Technology
Why does a dislocated shoulder never heal properly without surgery?
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A dislocated shoulder can be easily fixed by certain maneuvers done by the doctor. However, sometimes when the shoulder gets dislocated, the head of the humerus gets impacted against its socket. This can indent the head of the humerus or causes damage to the socket. When these occurs, the head no longer fits perfectly ...
Biology
the difference between milliamperage (mA) and kilovoltage peak (kvp) in radiology?
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This is an ELI5 explanation, and is not sufficient for a radiology exam. The kV is the potential across the tube (from anode to cathode) in kilovolts. Voltage controls the maximum energy of the individual x-ray photons. They will be a spectrum of energies less than the peak. The mA is the current through the tube in mi...
Physics
google analytics and how does using an add-on prevent it?
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Google Analytics is a free tool used by web developers to gain information about how users interact with a website. At its default, its relatively anonymous. We can learn things like the size of device you used, how long you were on a page, what pages you went to, etc. We can also learn general information like how man...
Technology
How does activated carbon work and why it's in every cleansing product now a days?
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Activated carbon is just regular carbon, but with a very fine poreous structure which creates a huge surface area for adsorption of all kind. It's widely used as a filtering material in chemical processes or agriculture. The sudden rise of its appearance in dermatological products is mainly a big marketing trend. Its e...
Chemistry
what was with the weird static noise speakers made when someone called on an old phone?
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That's a side effect of some of the older cellular technologies; the towers communicated with the phones (for some protocols) on a frequency and modulation that was really good at coupling with the amplifier circuits in headphones and speakers. Basically, the speaker/headphone was becoming an unintentional antenna and ...
Technology
How are songs ranked on the Billboard top 100?
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Billboard uses a formula to calculate what songs appear on the Hot 100 (its called Hot 100, not top 100). This formula includes streaming, radio play, and digital sales, each of which is broken down further later. Each category has a weight to and its own forumula that gives a certain amount of essentially "points" in ...
Other
What are tax exemptions/what to "claim" on your W4?
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Nominally, you pay taxes based on what you earn and your employer will take money out of each paycheck to cover your taxes. But there's all sorts of modifiers on how much you actually owe. For example, if you spend money towards your education, you don't have to pay tax on that money. If you donate money to charity, yo...
Economics
Why can't we upgrade phone parts like we do with PC parts?
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Same reason you can't upgrade most parts on most laptops or All In One PCs If you want things to be as compact as possible that doesn't leave much space for user serviceability and if a custom part makes your product 5% smaller that makes it significantly more appealing than a larger product using standard off the shel...
Economics
Humans often experience an acquired taste for beverages that they originally despised but now love, what's the reason for this?
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This is common with bitter food. Fermentation creates compounds which taste bitter in addition to toxic compounds. Therefore we have evolved to taste the bitter compounds and are hard wired to dislike the food because it can be toxic. However this might not be the case all the time. There are things which contain bitte...
Biology
Fundamentally as an object gets farther and farther away from us, what makes it look 'smaller' in our vision?
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Geometry, our vision is effectively a cone coming out from our eyes (alternatively the light rays which could possibly hit our eyes must be within that cone). If an object has the same size but a greater distance, then it will take up a smaller angle of our vision and look smaller.
Physics
Light reaching Earth comes from the past. Because this is true, does that mean that focusing a telescope on a source of light at different magnifications can give us a look at different points in the past or is what we see always constant?
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Telescopes only magnify the view you would see with your naked eye. It's still the same view from the same spot on Earth. To "move in time", you would have to instantly move the telescope closer or farther to the light source. And since light moves extremely fast, you would have to move the telescope millions of kilome...
Physics
Is there light in a closed box?
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The light would bounce around in on the walls in the box. Every time a bounce occurs, most of the light's energy is transferred to heat in the walls. And since the light moves at the speed of light, it will very quickly bounce many times, and all of its energy will be absorbed by the box in the form of heat. It will se...
Physics
How does getting your tubes tied work?
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The eggs get released on schedule and you still have your period and all of that lovey mess it involves. The only difference is that the egg runs into the scar tissue/ligation point and stops. Eventually the egg just dies and is collected/reabsorbed by the body. & #x200B; As far as day to day life, as long as the ligat...
Biology
Can a person survive a pulmonary embolism passing through their heart? Why are they so deadly for some and not others?
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Sometimes they go right through into the aorta, which is really big. Sometimes, they'll take a turn and go down one of the coronary arteries - those are much smaller, and you're likely to get a clog there, and since those supply the heart muscle with oxygen, that clog is going to ruin your day.
Biology
Why is comedy less funny the more you watch it?
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Comedy is probably best defined as the juxtaposition between the expected and the actual. For example, take the simple joke: Two men walk into a bar, but neither one ducked. You expected that "bar" meant "drinking establishment" but it actually meant "metal rod". The difference between what you expected and what was tr...
Psychology
How do we learn non expressible words as a child?
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We learn very few words by having their definitions given to us. We learn most words by example or by ostension (pointing). So our parents say, "Look at the firetruck!" *and* "There is a firetruck!"; but then they say "Look at the water!" but *not* "There is a water!"; they say "You are a sweetheart" but *not* "You are...
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