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Serotonin is the hormone what makes us happy, so why aren't we just injecting it into our body/taking it as tablets to get out of misery on command?
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Hormones like serotonin are like ingredients in a recipe. You need them to be in the right balance for a dish to work. Imagine serotonin as sugar, if used sparingly, you would enjoy it as a glaze or sauce in your entrees and finish your meal with a sweeter dessert. If you dumped a container of sugar on every dish of yo...
Biology
By default our voice is meant to be clear, but how do some voice actors make their voice become raspy or coarse on the fly?
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Not an expert, but as a 5th year linguistics student (focus on phonetics and phonology) I can tell you that manipulating your voice in many ways can be done with training and you can turn it on or off. Basically, your voice is a combination of your actual vocal chords vibrating and then your physical mouth and tongue s...
Biology
The solution to Fermat’s Last Theorem (unsolved problem in math for 358 years until Wiles in 1995)?
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I’ll give it a try, but it’s going to be very basic since most mathematicians don’t even understand it. Someone will have to correct me if I’m wrong. The idea is this: there are these 2 areas in math, modular forms and elliptic curves. An elliptic curve is just a graph that fits a certain parameter (like, linear functi...
Mathematics
Why are people trying to find the biggest prime number?
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It's an exercise in computation, mostly. There are a few large prime number searches that are trying to settle old mathematical conjectures (e.g. the Prime Sierpinski Problem), but for the most part it's just people who are fans of mathematics and who have computers letting them run to see if they can find a large prim...
Mathematics
If some of the elements on the periodic table can only be produced in a lab, why are they considered elements?
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Because they still exist? The periodic table isn't a list of things you'll find in your yard - it is a list of the nuclear elements which we have observed. As for why studying things that don't naturally exist is *useful*, the elements which only exist for brief periods often play a crucial role in nuclear chemistry. N...
Chemistry
Why is it OK to compare and draw conclusions from data where there are two samples of very different size?
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Sample size is important on its own as it relates to the statistical “power” of a study. Power is about how large of a sample size you need to detect a statistical difference between variables with a given amount of certainty. For example, let’s say we have a two-sided coin, and we don’t know whether it’s a fair coin (...
Mathematics
How, at 93 million miles away, does the sun feel so warm, yet when a simple cloud passes over it the warmth is incredibly dampened?
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So when you feel the sun's warmth, you're not feeling heat coming from the sun. You're instead feeling heat created *on your skin* by the sun's light. Light carries energy. Things with colour, like your skin, absorb light. When they do, the atoms that make them up get 'excited'. Depending on the atom, and what state it...
Physics
How do enzymes work? I know that they speed up chemical reactions, but how?
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Chemical reactions are all about energy and position. In regards to energy, some reactions need a certain amount of energy to start, even if the reaction ends up releasing energy in the end. Some enzymes help to reduce the amount of energy needed to start the reaction. In regards to position, some reactions require the...
Chemistry
Why do large, orbital structures such as accretion discs, spiral galaxies, planetary rings, etc, tend to form in a 2d disc instead of a 3d sphere/cloud?
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The really ELI5 answer. Everything wants to make a single ball of stuff because of gravity. But just like a centrifuge, spinning makes things want to go to the outside. Since they are only spinning in one direction, they only move to the outside in one direction. So you have a ball that is spinning and spitting out stu...
Physics
what are cramps and why do they hurt?
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some one correct me if i’m wrong, but its my understanding that your uterus is mad that theres no baby in it so it tears off and gathers up the wall paper it had ready for the baby, plus the crib it just bought with all the baby clothes and throws it out the door. in short. your reproductive system builds up in anticip...
Biology
correlation doesn't imply causation, then what does?
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Direct evidence. For example, if I say "everyone that drank water in 1800 is dead, therefore water kills you", that's not causation. Yes, the folks who drank water back then have died, but drinking water isn't necessarily what killed them, and everyone who drank anything back in 1800 is dead, so that isn't proof. So to...
Mathematics
How does lightning know where to strike on the ground when the energy is in the clouds? How does it know that there is a metal pole on the ground?
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It isn't that it knows there's a metal pole in the ground, it's that the metal pole provides the path of least resistance. If you pour water down a hill, it's much more likely to flow in a ditch you dug than over bumpy ground. This is because the ditch provides the least resistance. The metal rod is the same way. Metal...
Physics
Why is it that sometimes pens stop writing in a certain point on the paper, but then write fine on a different spot?
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Friction. A lot of pens use a ball that rolls to put ink on the page. When they stop writing, the ball isn't rolling, it's just gliding, so no ink is being delivered. There isn't enough friction to make the ball roll. On another spot, there is enough friction to make the ball roll again and start making ink flow again.
Other
What are NFTs in the art world and why/how are they bad?
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NFTs are non-fungible-tokens. They work pretty much like bitcoins only that they are unique and tied to an individual piece of art. So only one person can own this piece of art at a time. The enviroment suffers because to keep this system up a lot of computers need to run at full power to prevent people from cheating t...
Other
Why when you look at clouds you can’t see through them, but when you are in a cloud you can see some distance?
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Clouds are tiny droplets of water suspended in air. These droplets are spaced out quite a bit from each other and cause incoming light to bounce around and get scattered in all directions. This is why clouds appear white. When you are observing a cloud from far away, there are so many droplets in the way of the light a...
Other
Why have the salaries of athletes, actors, TV personalities, musicians way outpace salaries of traditional occupations over the past 100 years?
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Increasingly, salaries are tied to how replaceable we are rather than anything about how hard our job is or how much work is involved. Cleaners work very hard and long hours, but you can get someone else in to take over a job immediately with little training if someone quits, so they are paid crap money. Doctors/nurses...
Economics
How can earthquakes be "predicted"?
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Short answer: They can't be predicted, only detected. Medium Answer: You can sort of predict them on geological time scales (i.e. hundreds, thousands or millions of years) based on past patterns of earthquakes, but it makes predicting the weather next year look simple and reliable. Long Answer: Monitoring stations all ...
Physics
what’s the difference if any between working class and middle class?
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For most intents and purposes, the working class is loosely defined as those who hold jobs with lower barriers to entry, that are usually defined by the work they entail. This does not strictly refer to wage, but more towards the type of job they hold. This means that, with proper saving, the working class can be middl...
Economics
Is there any scientific reason or scenario that you would use the term "Dihydrogen Monoxide" instead of "Water"?
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No. The official name of the molecule as determined by the International Union of Pure and Applied Chemistry (IUPAC) is either "water" or "oxidane". The "dihydrogen" label is systematic but almost every small group of atoms in chemistry is given a different name. Methane (CH4) is officially "methane" and not "tetrahydr...
Chemistry
How does CPAP rid fluid from the lungs? (treating pulmonary edema with CPAP)
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CPAP stands for Continuous Positive Airway Pressure. What it does is increase the pressure going into your airways (for sleep apnea/snoring, the positive pressure prevents your airway from collapsing). In pulmonary edema, there is an excess amount of fluid in your lungs. The areas that are submerged can't transfer air ...
Biology
What is demonetization? How does it work as an economic strategy? And what is a measure of its success?
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The idea is that you have 2 types of currencies in a modern economy. Controlled and uncontrolled currency. Controlled currency is currency which is exchanged by means that leaves a register, meaning the goverment or a controlling authority can control and keep records of currency exchange made, This is mostly done for ...
Economics
If women had never been allowed to work, would a working family man still be able to afford a house and to provide for his family with only his job?
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Not likely without individual governments engaging in massive economic programmes to distort their economies. The problem you run into is that you’re trying to keep up with other developed nations with one arm tied behind your back, by artificially cutting your productive workforce in half. So, you need to make your wo...
Economics
Why do americans use 'cups' for cooking instead of weight?
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First off; you don't measure with weight either. You measure with *mass*. Less flippantly; it's much easier to measure a volume than it is to measure a mass/weight, particularly given that one absolutely requires a scale to do it accurately. In addition, since most ingredients for foods don't experience significant cha...
Other
How can we get such good quality photos printed on clothing/t-shirts?
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There are a few ways. You can print on to thermal transfer paper and then use an iron to transfer the image, which gives you great results but will start to crumble quickly in the wash. You can screen print, where you print the image onto separate masks for each colour, then apply dye through those masks onto the shirt...
Technology
what is a labor union? What are the pros and cons? Why are people in favor or against them?
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An employer-employee power balance is - by nature - heavily skewed towards the employer. This imbalance can be addressed by legislation (granting more special rights to employees) and by a unionized work force (meaning the employer now has to deal with a large influential entity instead individual and vulnerable employ...
Economics
Why do we get angry and frustrated when we’re in pain?
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Psychologist here! We do something called emotional regulation, which is a cognitive process. Our brains can only process a certain amount of input every second, so it needs to filter out a lot of the things our senses perceive at any given moment. Pain is high priority, so it is hard to filter out. Compare it to a per...
Other
What is the psychology behind having an imaginary friend?
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Forgive me, for I'm not an expert, nor do I have any qualifications that would be considered remotely Psychological, but I would think it has something to do with Love. Or more specifically, it's a coping mechanism. We all want to be verified in life. We all want to experience something with someone else, to make sure ...
Other
What is an Operating System?
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It’s software that creates a standard interface for other software to control the underlying hardware. Think of how cars work. Every car has a steering wheel, gas and brake petal and so on. But you can have a high performance engine underneath the hood. An operating system is like everything between the steering wheel ...
Technology
Why do people snore when they sleep but not when we're awake?
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Snoring is due to the fact that your mouth muscles are not tightened and that you usually have your head tilted back (or at least horizontally with your nose pointing to the celling). Basically, your palate loosen and your to~~u~~ngue roll back a bit thus kind of blocking the airway, but not totally which is why it mak...
Biology
Why aren't high energy photons more massive than low energy photons?
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E = mc^2 is only a shortened version of the full equation. The full equation is E^2 = m^2 c^4 + p^2 c^2, where m is the rest mass of the particle. A photon, by definition, **has no rest mass** i.e. m = 0. So it's equation for energy is E = pc. This means that higher energy photons have more momentum. Note that in relat...
Physics
How can companies, specifically like Spotify, continue to operate while losing so much money?
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Tldr: investors thinks that spotify will eventually make money, so have granted them large amounts of cash that they can burn until they finally start making a profit, which can hopefully pay back the original investment. Long answer: There are no special rules. If you're losing money then eventually you will run out o...
Economics
Why does hay fever not bother you when sleeping, but if you wake in the middle of the night or first thing in the morning, BAM! suffer city?
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There are cells in your body called MAST cells that make histamine when something you are allergic to touches them. Histamine causes the hay fever. It has a natural cycle that is synced to your sleep/wake cycle. Histamine production peaks during the night and you immune system is doing the most uncomfortable work while...
Biology
Why can you only see the at edges of your peripheral vision in the dark?
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The center of your vision is filled with color sensitive cone cells. They're great at telling colors and giving a crisp image, but need a lot of light to work. The far periphery of your vision is mostly light sensitive rod cells. They can work even in extremely low light conditions, but can't differentiate colors. In a...
Biology
Koan - A riddle without a solution, used in Zen Buddhism to demonstrate the inadequacy of logical reasoning and provoke enlightenment. What does this mean?
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Zen draws on the Buddhist tradition of belief that the world as we experience it -- both individually and between ourselved -- is an illusion, and that gain a true understanding of what is, what it is like, and so on requires disengagement from the illusion. Logical thinking demands interaction with the illusion. Koans...
Other
Why can't we solve the Theory of Everything (Grand Unified Theory)? What are some missing links? Do we think it can be solved?
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We have two freakishly accurate theories: general relativity and quantum mechanics. They both make incredibly accurate predictions that have stood up to almost every experimental test we've thrown at them so far, which is an enormous achievement for any scientific theory. And they mostly don't overlap....quantum mechan...
Physics
Why do banks even issue mortgages? Wouldn’t they get significantly better returns in the market?
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Why do some people sell candy bars (7-eleven)? There's demand for it, *someone* can make money by selling it. And you need to have money in order to invest it. Also, it's not as simple as the average rate of return. There are a lot of people who want to beat the market, or who invest more actively. E.g., if I predict t...
Economics
How do we modify rice or other foods to include more vitamins?
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For any processed food they add powders containing the vitamin or mineral that they say they are adding. One of the easiest ways to show this is almond milk with added calcium if you put a container of almond milk into a clear container and put that container in the fridge you'll see a powdery residue on the bottom of ...
Biology
Why is it that the center of a watermelon is the most tasty part of it?
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Fruits have tough rinds to protect from very small animals that aren't capable of distributing the seeds well. If the inner flesh of a watermelon was exposed, insects could swarm and eat all of the sugary material while not carrying the seeds away. However, a large bird or primate would be able to break the fruit open ...
Biology
How does "the shot" (birth control) last so long?
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If you want to look at metabolism and excretion of any drug, check out the pharmacokinetics section. From the article, I'd guess * Because it binds well to proteins in blood plasma, it's harder for the kidneys to filter out the drug (proteins don't enter the filtrate in the nephron [the filtering unit of the kidney]) *...
Biology
What is a god complex?
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A person's belief that they are in control (in one way or another) of everything or almost everything. For instance, if I believed that my parents died in a car crash because I wanted it to happen, that might be an indication of a god complex. If I had similar beliefs for many other things that happened in my life, it ...
Psychology
Why is a fresh water stream close to the mountains rather blue-ish and not transparent?
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The blue comes from the sunlight. Water is usually most pure at the head of the watershed. So local minerals and dead plants have not had enough time to stain the water. The creamy appearance is from glaciers grinding the rock that it slides over. Bonus fact: Make sure never to drink that type of water without filterin...
Earth Science
Why is standard deviation a better measure than mean deviation?
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In some way, both are measures of the dispersion, and none is better than the other in an absolute way -- for a given purpose one or the other may be more advantageous. Compare with the measures of centrality: median, arithmetic, geometric, harmonic means have the same type of relationship. Now standard deviation has n...
Mathematics
As Francium is the most unstable element, how much more energy will it generate if it is split compared to, let's say Uranium?
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The half-life of an element doesn't really say anything about the energy release per-atom when fission occurs. Fr223 to Ra223 produces 1.149 MeV of energy Boring U238 to Th234 produces 4.270 MeV of energy, but only once every 5 billion years. Shorter half-life isotopes release more heat overall because the decay is so ...
Physics
Why would the government classify Alien activity ?
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It is almost guaranteed that evidence of extraterrestrial life would destabilize the planet. We've seen how people behave at a Walmart on Black Friday - How would they act if they found out there was a superior species *out there*? Fear, hope, riots, gatherings would occur. Everything you know and love about your socie...
Other
How do reward systems make you addicted?
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Excitement and anticipation are powerful motivators. If you repeat an activity, and get rewarded for it, your brain releases endorphins and other chemicals. Keep doing it and you begin to react with pleasurable chemicals *before* you open the box, the anticipation starts the cycle of your brain's reward center. It's ba...
Biology
Is Australia the continent, or is Oceania? What's the difference?
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Australia and Oceania are different places. It is confusing, because Australia the country lies in Australia the continent. Oceania is a place full of islands, made up of Melanesia, Micronesia, and Polynesia. There are islands that are part of the country of Australia, just like there are islands that are part of the U...
Earth Science
How do CPUs have such a high wattage and such a low voltage?
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yes, they do. They run at such a high speed that the transistors are always switching, and therefore they're pretty much always in their linear region and burning power. They tend to have upwards of 8 seperate power phases for high end CPUs. Look on the motherboard, near the CPU there's a bunch of massive inductors. ea...
Technology
how does Lamotrigine work as a mood stabiliser?
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So as with many psychotropic drugs the exact mechanism of action (MOA) is unknown but we know that they do work. Lamotrogine is classed as an anitepileptic drug but alongside others such as sodium valporate there is sufficient evidence that they are effective in treating bipolar 2 disorder and is used in that context a...
Biology
How does increasing fluid intake help when you’re sick with the common cold?
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With cold,you lose much water unknowingly by the nasal secretions. Just to replace those fluids we advice patients to be hydrated enough so that the patients urine is clear or pale yellow. Same with vomitings or diarrhoea. With fever ,you lose water by peripheral vasodilation to keep off the heat which causes dehydrati...
Biology
If I sell stock, who buys it?
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The stock market matches buyers and sellers in real time. You own shares in XYZ Corp you want to sell. So you put in a sell order. At the same time, the exchange is taking buy orders from investors wanting to buy the stock. It matches the buys and sell orders. If there are more buyers than sellers, the price will go up...
Economics
Why does spinning make you dizzy?
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We have structures in our inner ear called semicircular canals. Think of them like tubes filled with hairs and liquid. And as we move around, or change our orientation, this liquid squishes around the hairs, and the hairs tell our brains how we are situated based on which ones are getting squished. Getting dizzy is ove...
Biology
If love, feelings of happiness, loneliness, etc., are just chemical reactions in your brain, why can't things like loneliness be cured just by supplementing them with the missing chemicals?
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Maybe one day we might be able to. We still only have a basic understanding of the brain. It's like asking why the Wright Brothers didn't fly to the moon. There is so much we still don't understand about the brain and medicine. We get a step closer every day. Technically I guess you could cure loneliness by drugging so...
Chemistry
The earth is about 4.5 billion years old, but at what physical point do scientists classify a planet's age as 0?
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When it started to be a planet. To be a planet, it needs to fit three criteria: A planet is an object in orbit around the Sun with a diameter greater than 2000 km. A planet is an object in orbit around the Sun whose shape is stable due to its own gravity. A planet is an object in orbit around the Sun that is dominant i...
Physics
Why should I care that Google and other tech giants have my data?
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Because you have almost no say in what Google does with it. Sure, it might might OK if they sell it to a company who uses it to show you ads for things you actually like or want. But what if Google were to sell your website browsing info to your health insurance company? Say you were looking up a place to go skydiving,...
Technology
Seeing as I just got my first snowfall of the year, what makes snow stick more or less to different surfaces?
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The temperature of said surface. Streets that are more driven stay warmer due to the tires of cars producing heat with the friction against the road. Bridges keep snow/ice longer due to the fact they are completely surrounded by cold air (despite the fact they may be busy roads). The ground temperature also plays a par...
Physics
What exactly is turbo lag?
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It’s easiest if you think about a turbo in two halves: the turbine side and the impeller side. A turbo works by forcing the exhaust coming out of the engine to spin a turbine that sits after the exhaust manifold which is connected to an impeller that drives air into the engine before the intake manifold, increasing the...
Technology
How do companies not run out of stocks?
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You're asking a wrong question, sorta When a company goes public, ALL (*some exceptions) of its stock is public to be bought or sold. Any owner of any individual share can choose what to do with their share, they could sell it or not. That is, all shares of public company are always "taken" to use your language. Really...
Economics
is person mind really divided to conscious and subconscious or is this division made for convenience to discrube some psychological phenomena ?is there other psychologicsl model which does not make this division?
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Part of your mind controls your heart beat. But your are not consciously aware of it. Part of you mind also controls your breathing. You probably were not consciously aware of your breathing, although reading this you might be now. In 10 minutes you won't be conscious of your breathing. As I am typing now, I am conscio...
Psychology
Dictators and why people see to blindly believe in them?
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The simple answer is that by the time someone can be called a dictator, they've taken over the media, silence dissidents, censored the internet, murdered/jailed the opposition party and control information to the point that an alternative to the narrative doesn't really exist. Especially when so many people are just bu...
Other
How does peoples personal lives affect the global market? E.g. Bill Gates divorce
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The main reason is because they jointly run a massive philanthropic network. The implications of their divorce on the finances of that network (and on global philanthropy as a whole) would be significant, which is why they put out a joint statement indicating that they would continue running it together despite their d...
Economics
What are the 22 states of matter?
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TLDR: Its all subjective based on how scientists want to group things by properties but in daily life only the classical states matter: Solid, liquid, gas, and plasma. A "state" of matter is a condition of being where a set of things in that state have a uniform set of properties, and that set is generally distinct fro...
Physics
Why does over sleeping makr you feel "hungover"?
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ELI5 answer: You just effectively gave yourself jet lag and probably had low blood sugar when you woke up because you hadn't eaten for at least 10 hours. ELIHighschoolStudent answer: -Sleep [occurs in cycles]( URL_0 ). If you've been up for a long period of time you'll still only get a few deep sleep cycles which means...
Biology
Why is American candy packaging so much thicker than in other countries?
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Americans have more money than people from most other countries so they’re fine paying the extra few cents for the packaging. And for developed countries, America has lax environmental regulation so you can use thicker material to make your product look better than others. Funny thing happened because of this, though w...
Other
Are there certain foods you can't be allergic to?
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(EDIT: The vast, vast majority of) Allergies are triggered by an inappropriate immune system response to specific proteins. So, one cannot (EDIT: In the vast, vast majority of cases) be allergic to pure water, pure salt, pure sugar, pure fat, pure sand, oxygen, etc. Naturally, nothing handled by humans is going to be p...
Biology
Why are people donating money to help California after the wildfires? Shouldn't peoples' home insurance take care of that for them?
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Insurance Companies will pay for repairs but in the meantime you still need a place to stay and food to eat. Perhaps your place of employment was burned down too. Having said that, I almost never give to disaster relief efforts as the scammers and skimmers come out in full force and the money doesn’t get to where it’s ...
Economics
if almost all industries are inversely related with the oil industry (if the price of oil drops, then things become cheaper to produce), why is the economy so reliant on having a high price for oil?
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Well, it's not. The economy as a whole does better when oil is low and does worse when oil is high. However, the oil industry itself does terrible when oil is low and well when oil is high. So local areas that have a lot of oil jobs (the gulf coast, fracking towns in the Great Plains, etc.) tend to swing in the opposit...
Economics
Why do video game console makers lose money from consoles regardless of success and popularity?
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Because consoles are almost always sold at a loss. Making and marketing a home video game console is pretty damn expensive, and nobody expects to actually make a profit on the console. The point of the console is to get you into their game/media environment. Because games are basically all profit for the console manufa...
Economics
Why does the earth's rotation affect a pendulum, but not anything else that hovers above the ground?
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The *Coriolis effect* happens when you're on a rotating surface and you change your distance from the center of rotation. It's easiest to explain if you think about standing on a merry-go-round. All the horses on the merry-go-round make one full rotation in the same amount of time. But the horses farther from the cente...
Physics
Why is seawater so hard to convert into drinkable water?
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It's just hard to do it cheaply. A lot of people think that membranes are the way to go because membranes can let water pass but stop other stuff. But you got to push the water through the membrane and that takes pressure which takes energy. But who knows, maybe someone will think of a cheaper way of doing it.
Technology
How does a GPU converts data to a picture/ graphic on the screen?
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Picture on screen is also data, just several numbers for each pixel on the screen specifying which color it should be. GPU just builds that array by doing some math to determine which parts of 3D models you should see, and how their color is changed by light effects and so on.
Technology
Why does 1% battery life last longer than any other percent?
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The battery life indicator on a device is indicative only. Modern devices take a particularly active approach to battery management. In order to maximise battery life, a device migh fast charge the battery up to 100% when it's first plugged in, then allow it discharge down to 85% while still plugged in, then alternate ...
Technology
Why is it preferable to have illegally obtained evidence thrown out of court as opposed to keeping it and prosecuting the one who obtained it?
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The Supreme Court discusses this rationale in every exclusionary case. The first thing to keep in mind is that the Constitution does not require an exclusionary rule. But for the 4th Amendment to have any value it must have some remedy or mechanism of enforcement. Suing the officials for an illegal search is always an ...
Other
Bio/Organic Chemists:Can you identify whether a particular organic is edible (fat/protein/carb), a drug, a poison, or not edible (ex: byproduct of crude oil)?
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In general, simple crude oil derivatives are long, straight chain carbon chains with just hydrogen attached. For example, butane (like in camping gas) is 4 carbons with 10 hydrogens around it. A heavier, longer carbon chain of 8 carbons (octane) is a liquid. The longer the chain, the stronger the interaction between ea...
Chemistry
why do we get night sweats when we are suppose to have our lowest body temp when asleep?
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It’s very important to distinguish between night sweats (ie spontaneously sweating while you sleep) and sweating at night because you’re in a squishy bed under blankets and have warmed up. Spontaneously sweating at night when the temperature wouldn’t normally make you do so can be a sign of a medical problem. Get it ch...
Biology
what is the difference between white meat and dark meat in a chicken?
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Breast is white because the fuel for these muscle fibers comes primarily from a carbohydrate called glycogen and doesn’t require as much oxygen from the blood. Glycogen is useful for short bursts of activity. Dark meat get their fuel primarily from fat, which provides a more sustainable energy (for the prolonged activi...
Biology
Why does a foot massage feel better when someone else does it than when you do it yourself?
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When parts of your body touch other parts (which they do all the time) the brain lowers the sensation it provides. This is because else we would tickle ourselves all the time just by moving our body. So if someone else does it you can actually feel it more than if you do it yourself. There's also the emotional differen...
Biology
When should bitwise operators be used?
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Bitwise operators allow you to manipulate the values of individual bits in a word. It is useful when you're working with limited memory (typically because of simple hardware) because you can then pack 8 values in a single byte instead of using 8 booleans (which costs 8 bytes, because in many languages, a boolean is imp...
Mathematics
What the heck is Poe’s Law?
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It's a notation made by Nathan Poe made in a forum about when is it possible to tell a difference between mocking and sincere words one told. Say I tell you "Don't forget to check if you got autism from the vaccines you took last month." That's hypothetical, of course, I have no idea what you took or didn't take. Anywa...
Other
Why are satellites more powerful than wifi?
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The distance a radio signal can travel is based on how strong the signal is. GPS satellites are allowed to broadcast very strong signals. Your Wi-Fi transmitter is not. This isn't a technical limitation, it's a legal one. The reason your Wi-Fi router's signal strength is limited is that if everyone broadcast really str...
Technology
Why does a company or any organization still need accountants? Why cant every transaction be recorded in a computer and entered into the books automatically without needing a person to do it?
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Well, many companies do fully automate their accounts already, e.g. they may conduct all their business through an enterprise platform like [SAP] ( URL_0 ). But there are still questions about how to interpret the law and categorise things within such systems. Laws, regulations and accounting standards can change, and ...
Economics
how do bell curves work?
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"Bell curves" or Normal Distributions are simply a function defined by humans - it doesnt have any very special properties. However, we found that the outcome of many random processes in nature are distributed in a way that looks more or less like a Normal Distribution. We like to approximate such probability distribut...
Mathematics
why does work appear to go by faster when making an effort to never look at the clock?
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It has to do with where your focus is and the fact that your brain doesn't count time like a clock does. It works in memories. If you focus on the clock, you're making memories of time. So when you think back you remember each time you checked the clock and some feeling associated with that knowledge (usually dispair)....
Biology
Did the pilot who dropped the nuke in Japan live? If so how?
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Both pilots survived. The planes were flying too high for shrapnel to reach them. The most destructive blast wave from the bomb which hit Hiroshima was about 1 mile in diameter, and the plane was flying at about 6 miles in the air. They were 11 miles away when they felt the shock wave, (and if my high school trigonomet...
Other
Why does sugar free soda fizz way more than regular soda?
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Artificial sweeteners in diet sodas are much sweeter than regular sugar so you need to add less of it to get the same sweetness. Diet sodas are usually > 99% carbonated water with < 0.2 grams of artificial sweetener. In contrast, regular sodas have a great deal of added sugar. A regular 12 oz (355 mL) can holds about 1...
Chemistry
What are the mid-term elections and who won?
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> Every state is represented by two Senators, but by different numbers of Representatives based on their population. The Senate gives small states equal representation, because the Senate is about representing the states. The House is about representing the people directly. & #x200B; Long story short, Democrats took ba...
Other
Why is the hotel industry dominated by international companies (Marriott, Hilton, etc.) but apartments are almost always locally owned/run/branded?
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> Why has the hotel industry seen huge consolidation but the apartment industry hasn’t? The hotel industry by and large hasn't seen huge consolidation. The vast, vast majority of hotels are actually locally owned. The big hotel companies are mostly just management companies. They don't own most of their hotels, rather,...
Economics
Why do flags wobble in the wind even when the wind is steady?
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Not 100% sure but i think its because even though the wind looks like its traveling in a single direction, the air molecules are still moving in different directions and with different velocities. Therefore when the wind is traveling around the flag, there are areas of different pressure that push and pull the fabric o...
Physics
Why do the longest and shortest days of the year not coincide with the yearly average hottest and coldest days?
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Because it takes time to heat up and time to cool down. It's the same reason the hottest part of the day is usually a few hours after noon, and why everything doesn't immediately freeze after sunset. Think of it this way. If the days were all the same, the temperature would not change, right? It would be in equilibrium...
Other
what are eigenvalues and eigenvectors?
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Imagine you have a function that let's you write f(x + y) = f(x) + f(y) f(a * x) = a * f(x) For any x, y, and a. If we have f(x) = a * x for some x that is not 0 and some a, then a is called an "eigenvalue" and x is called an "eigenvector". That's it. Despite its simplicity, this is an incredibly broad and important co...
Mathematics
How does dust accumulate in an electric fans blades while they’re constantly moving fast in a circular motion?
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Hey, aerospace engineer here. There's a long complicated aerodynamic explanation but here's the short of it. ELI5: at the point where air meets the surface of the blade, the speed of the air is zero. Therefore, a piece of dust on the surface is not being blown anywhere. When you spin the blade through the air, it slams...
Technology
How do consumption products (Alcohol, Marijuana, Cheese, etc) contain "notes" of other foods?
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While they may not contain any of the other foods as an ingredient, they do often contain some of the same chemicals that cause those flavors, or similar ones. The description is just a way of describing that flavor; most people know what nuts taste like, so saying a cheese is slightly nutty gives you an idea of the fl...
Other
How is it ensured that Wikipedia articles show correct information, and how is vandalism of articles prevented on it?
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There's no iron-clad guarantee that all of the information on Wikipedia is accurate. The prevailing pattern however is that there are more benevolent people adding correct information than vandals intentionally adding incorrect information. Some people take a personal attachment to certain articles and set up notificat...
Technology
How does COPPA affect YouTubers that do not live in the US, I mean the FTC is a US commission so how does it affect international YouTubers?
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COPPA is about who is viewing content, not who is making it. Youtube can't collect data on American children, so as long as a portion of your audience *could* be American children, you have to deal with COPPA. Youtube will probably just implement it platform-wide, across all languages, because its safer than leaving th...
Other
the discrepancy in size between the observable universe and the age of the universe. If the universe is 13.8 billion years old than how can it be observable to 43.5 billion light years?
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Space is getting bigger. Like, things get farther apart faster than they're actually moving, because more space is coming into existence between them. The current rate is 68 kilometers per second per million parsecs; in the early universe the speed was much faster. What this means is there's light from the early univer...
Physics
How does "You can't prove a negative" work?
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"There is an alien in my house." This is a positive. I can prove it by finding one alien in my house one time. "There is no alien in my house." This is a negative. I can't prove it. Even if I check every square inch of my house, maybe they are really small and I can't see them. Maybe they are invisible. Maybe they know...
Mathematics
Why are most "extremely absorbent" products harder when they are dry when compared to regularly absorbent products? For example, sponges / cooling towels / Shamwows are usually much harder than cotton or paper towels when dry.
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The whole thing that makes a sponge useful is that it has a huge surface area relative to its size and mass. If you could zoom in you'd see tons of little nooks, crannies, and projections that present a surface to be wetted. A paper towel has *a bit* of that going on, but it's not that textured or absorbent. Having sai...
Chemistry
Why do animals and birds behave strangely during eclipse but not when sun is blocked by clouds?
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The difference in light intensity is significant between a cloud or the moon covering the sun. Despite the fact that you can't see through clouds, they still let through a lot of light. The moon however is a solid rock and casts a far darker shadow over the earth. Animals are able to pick this sudden change up and comp...
Biology
how do coin dispensing machines know the difference between $1, $5, $10 etc. dollar bills?
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Paper money printed in the United States contains, in addition to a plethora of visible security features, some very elaborate methods to assist in automated denomination recognition. The primary method vending machines use to recognize the denomination of paper money is through a magnetic scan; paper currency is print...
Technology
why does having your credit checked negatively affect your credit score?
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There's a presumption based on lots of creditor experience that credit checks very quickly lead to taking on new debt. Actually taking on new debt has a much greater impact on credit score, but just starting the process sends a signal to creditors that this person seeking credit is about to have a more debt and worse l...
Economics
How do additive alphabetic numeral systems express decimals or numbers several orders of magnitude larger than their largest numeral? Or are they necessarily limited compared to positional numeral systems?
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I believe I've seen some examples of using multiplication to describe large numbers, like "their army numbered one thousand thousands" and such. Decimals by definition require a numbering system like ours, but if in general you mean tiny fractions, I have seen expressions like "the hundredth part" or "like one drop in ...
Mathematics