Question: Why is facial recognition use by law enforcement so opposed?

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 Why is facial recognition use by law enforcement so opposed?

Every record of you has the ability to be used against you depending on who happens to be in power. Constant surveillance inevitably leads to behavioral control. Sure it’s about catching criminals today. But say 10 years from now the fact you walked into a candy store might be used to increase your health insurance rates. We already have evidence of this with car insurance companies increasingly wanting to install vehicle trackers so you get a “discount” or life insurance companies using your financial data to price policies. Or even employers who Facebook stalk their employees to decide who to fire and who to promote. In China your behavior while playing video games can impact your social score which can lead an inability to travel. Sure, that country is an extreme example but it Is something that could happen anywhere people aren’t vigilant about protecting their privacy.


Question: Is ECMO basically like dialysis for the heart?

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 Is ECMO basically like dialysis for the heart?

Similarities- They replace the function of an organ imperfectly to buy time for a permanent solution. Differences- Heart functions are needed constantly. Kidney functions can be left for a few days while still living a mostly normal life in between dialysis appointments. While I think it's commonly a mistake, dialysis can be performed indefinitely without seeking a transplant. Patients can survive for decades on dialysis, the longest ecmo patient is a less than two years and not getting an infection over that time is a minor miracle. So yes and no.


Question: How do air conditioners work?

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 How do air conditioners work?

When you compress a gas, it becomes hot. You can observe this by for instance inflating a tire. When you uncompress a gas, it becomes cold. You can observe this by using a spay can. The air conditioner uncompresses the gas on the inside, which makes it cold. The warm air in the room then warms the gas, transferring some of the heat into it. Then the conditioner moves the gas to the outside, and compresses it. This makes it hotter than the outside, so the gas cools until it's at outside temperature. Then it starts the loop again. Metaphorically you could view the gas as a sponge. The sponge is uncompressed inside and absorbs heat, then is moved outside and the heat is squeezed out.


Question: What is happening physiologically when you get headaches from thinking to hard?

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 What is happening physiologically when you get headaches from thinking to hard?

Hello, Unfortunately we do not understand complex neurological functions enough to have an answer for this. Anybody who gives an answer apart from “we don’t know” is either lying or misinformed, so be weary. Additionally, this is anecdotal and not everyone (I’d venture to say *most*) don’t experience this. I definitely do not. Hope that answers your question. Cheers.


Question: How did CIA get away with mk ultra project? I mean how come CIA is still in the function today and those that were included in the project didn't go to jail or something?

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 How did CIA get away with mk ultra project? I mean how come CIA is still in the function today and those that were included in the project didn't go to jail or something?

Short Answer, it didn't "get away with it" Well first, what was Project MKULTRA? Beginning in the early 1950s, the CIA operated a program known as MKULTRA, which mostly involved the administering of LSD and other drugs to unconsenting adults, including Americans. The program stemmed from an Agency fear that the Soviet Union and other communist countries were developing chemical and biological agents for the purposes of interrogating, brainwashing, and possibly even attacking Westerners. As the Church Report described: > The CIA had received reports that the Soviet Union was engaged in intensive efforts to produce LSD; and that the Soviet Union had attempted to purchase the world’s supply of the chemical. As one CIA officer who was deeply involved in the work with this drug described the climate of the times: “[It] is awfully hard in this day and age to reproduce how frightening all of this was to us at the time, particularly after the drug scene has become as widespread and as knowledgeable in this country as it did. But we were literally terrified, because this was the one material that we had ever been able to locate that really had potential fantastic possibilities if used wrongly.” The MKULTRA program sought to administer LSD and other drugs to individuals in order to determine the threat of such drugs, and to design means to thwart that threat. In most cases, the subjects were unwitting nonvolunteers, who were slipped the drugs in their drinks at parties or at bars.The MKULTRA program eventually became quite extensive such that, by the time the CIA terminated the project in 1963, it contained 149 subprojects that the CIA contracted out to more than eighty universities, hospitals, pharmaceutical companies, and other institutions. However, the full range and extent of the program, as well the number of individuals affected by it, is impossible to determine because the chief of the program ordered all MKULTRA records destroyed in January 1973. There is no doubt that the MKULTRA project was illegal from its inception. This may be why the CIA’s Office of General Counsel was not informed of the project until years after it had been terminated.Upon learning of the project, the CIA’s General Counsel immediately condemned it,and with good reason. Government experimentation on unconsenting individuals, such as occurred in the MKULTRA program, was a clear violation of the Constitution. The courts have long held that the Fifth Amendment’s protection of liberty interests includes protection from nonconsensual experiments on a person’s body. Usually described as the right to bodily integrity, this is “a right which has been recognized throughout this nation’s history. Unconsenting human experimentation also constituted a tort for which the United States could be held liable under the Federal Tort Claims Act (FTCA). Indeed, courts have upheld FTCA claims specifically made by alleged victims of MKULTRA. MKULTRA however was not successful. To learn more about MKULTRA watch the film “The Sleep Room” about how dumb the entire program was & what a colossal failure the program was.


Question: Why are some chain restaurant locations better than others?

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 Why are some chain restaurant locations better than others?

Because people cook your food over a fire or grilltop, and both people and fire fluctuate. Some chain restaurants have tried to fix this problem by making all their food in a factory, shipping it frozen, then microwaving it at the restaurant. Olive Garden and Ruby Tuesday have both tried this. The result is very consistent. Consistently tastes like frozen dinners out of a microwave.


Question: In America, why are interest rates for college student loans astronomically higher than those for home and car loans?

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 In America, why are interest rates for college student loans astronomically higher than those for home and car loans?

House/car loans have the benefit of being secured by a piece of property: in the event the borrower defaults (fails to pay back) on the loan, the lender can in many cases reclaim the property and sell it to recover at least part of the loan balance. For student loans, there is nothing to repossess, and private student loans are considered even riskier as they are usually a last-resort funds source. Federal student loans have a moderate interest rate, are essentially backed by the government and have limited borrowing amounts (along with being difficult to discharge due to bankruptcy).


Question: Why do people feel cold when their temperature is running high?

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 Why do people feel cold when their temperature is running high?

The [hypothalamus]( URL_0 ) controls many functions in the body, only one of which is temperature regulation. In response to pyrogens (literally meaning "heat producers") being released into the blood stream by bacteria, tumors, even tissue trauma, for example, the hypothalamus raises the set point temperature. When this occurs, it induces vasocontriction and shivering. Vasoconstriction makes our skin feel subjectively cool, while to someone who doesn't have a fever, we feel hotter than normal. Shivering causes our muscles to produce heat. We seek a warm place, or cover ourselves with blankets until the sensation of being cold passes. Once the core body temperature is raised to the hypothalamus's set point (say, 101.3 degrees F), the feeling goes away. We've reached the hypothalamus's goal. There is still speculation as to whether riding out a fever is helpful for our immune system. Giving antipypretics like ibuprofen or acetaminophen to lower fever is more a comfort measure, as body aches often accompany fever.


Question: () Why does currency in some countries work in thousands while it doesn’t in others? (I.e €100 = around 8000 rupees)

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 () Why does currency in some countries work in thousands while it doesn’t in others? (I.e €100 = around 8000 rupees)

It’s all relative. The US could start operating in pennies if it wants to, but that just isn’t the convention. It’s whatever physical currency denomination that’s easiest to use. The $10 bill could instead say “1000 cents,” and it’d be the exact same thing. People (banks) really just thought it was easier to make these conventions back in the 1700s/1800s


Question: Does light have mass and/or weight?

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 Does light have mass and/or weight?

It possesses momentum and energy, and can curve spacetime and be affected by the curvature of spacetime, but it does not possess what we call mass. You can internalize this as understanding mass has the property of inertia, in that a force can change the speed at which mass travels. Light cannot change its speed. It does not speed up, it does not slow down, and possesses no acceleration. Either light is moving at the speed of light or it does not exist.


Question: how do autodimming mirrors work?

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 how do autodimming mirrors work?

This is how it works in my vehicle (1997 Jeep Grand Cherokee) with an auto-dimming rear view mirror, I'm assuming they're all similar. There's a light sensor on the front (facing the windshield) of the mirror and another on the back (facing you). When the amount of light detected by the rear sensor is X times higher than the amount of light detected by the front sensor, (i.e. it's dark out and someone is tailgating you with their high beams on) the vehicle's computer sends a signal to apply a voltage across a fluid built into the mirror. When the voltage is applied, the fluid goes from clear to a darkish-clear color, which blocks some of the light, so the mirror dims.


Question: If you trap a beam of light inside a perfect mirror sphere, where does it go?

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 If you trap a beam of light inside a perfect mirror sphere, where does it go?

Yes, but the reality is that real mirrors aren't perfect, so if you do that for a real mirror sphere, it will end up eventually being absorbed by the mirror and turned to heat. Each bounce will cost around 1% of the light being turned to heat even with extremely good reflectors. Also, you'd never be able to view it, because any device put in to view it would also absorb photons.


Question: How does sun screen work?

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 How does sun screen work?

Sunscreens only block ultraviolet lights, since that’s the part of sunlight that causes sunburns. Since sunscreen doesn't absorb visible light, it appears clear when put on your skin. But with the help of a [modified camera that sees UV light,]( URL_0 ) you see that the sunscreen looks like black grease paint. It appears black in the UV camera because it's absorbing all the UV light that hits it, just like black paint looks black because it absorbs all the visible light.


Question: When metalsmith's make swords, when we did we begin to fully understand what was happening with the metal from a scientific perspective?

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 When metalsmith's make swords, when we did we begin to fully understand what was happening with the metal from a scientific perspective?

For a long time, metallurgy was a refined trade that was held by master craftsmen, who did not trust their knowledge to anyone except their apprentices, because if 'just anyone' knew what they knew, the local smith might quickly be out of a job. With the invention of chemical sciences, people began to understand that metallurgy was basically just like any other practical craft of mixing ingredients together and making shapes out of them, like baking and pottery. The temperatures and forces involved were just larger. *De re metallica* by Gregorius Agricola was probably the first dedicated text about metallurgical sciences and ores in modern history, published in 1556. The exact compounds that were historically important in blade-making are compounds around iron and steel (iron-carbon mixtures): ferrite, martensite, pearlite and cementite. Knowledge, experience and understanding of these compounds expanded rapidly with the invention of the Blast Furnace, around the beginning of the 16th century in France.


Question: why do some emails arrive almost immediately after being sent, and some take a significantly longer amount of time, sometimes hours?

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 why do some emails arrive almost immediately after being sent, and some take a significantly longer amount of time, sometimes hours?

Could be network issues if you are referring to emails between the same sender/recipient. If it's between different senders each time, it could be the firewalls involved that are different between one site and another. Or maybe the path it takes has multiple hops. Could be the size of the email. So, it depends.


Question: Why do humans laugh? Is there any scientific explanation about laughing?

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 Why do humans laugh? Is there any scientific explanation about laughing?

Between 6 to 8 weeks, all human infants, including blind or deaf ones, exhibit something called "Social Smile". Ethologists mostly believe that this behavior has evolutionary value. This social smile will later become much more prominent and exhibit after the presentation of stimuli (and thus disappears in blind children). This smile causes the infants' caretakers (i.e parents) to respond by taking care of the child. This is something with which you might be familiar. Think of a baby in your family, the moment he/she smiles, everyone loses their minds! They interact with the child and it is very endearing. By association, smile and laughter will remain in the human psyche, so does crying. You can ask the same about crying, the distressing noise that the baby makes forces the caretakers to respond to his/her needs (i.e nutrition mostly). In other animals, we have other forms of "affection" based on their physical and psychological structure. Cats groom each other, so do many apes and monkeys. For example, cats knead their mothers' nipples to stimulate lactation. This kneading is associated with the satisfaction of the most important need of the kitten, hunger. This is why older cats also knead. It both strengthens their muscles, and reminds them of the good times they had with the good ol' nipple!


Question: - How does a Cardio Bypass actually work?

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 - How does a Cardio Bypass actually work?

Couple things before getting in to the nitty gritty. First, the cardiopulmonary system is just a fancy plumbing station. There is nothing mystical about the heart, it’s just pressure gradients and tubes. The blood will always move from an area of high pressure to an area of low pressure. Second, there are many ways to cannulate but I’ll be speaking broadly. The process of rerouting the blood to the bypass circuit is known as cannulation due to the fact that it needs two main cannulas, which are just huge catheters. One goes into the main venous system (usually through the Right Atrial Appendage) and sits in the IVC (inferior vena cava) which is the main vein coming from your lower body. The other goes into your ascending aorta, just beyond your aortic valve. Blood is removed by either gravity, suction, or both from the venous side, put through an oxygenator that removes CO2 and loads O2, and pumped back into the aorta. The aorta between the aortic cannula and heart is then cross-clamped and the heart is chemically arrested. This provides a bloodless, immobile, surgical field. The first image [here]( URL_0 ) gives a good visual. Can answer questions if you need


Question: How do meteorologists determine a percent chance of rain/snow/etc?

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 How do meteorologists determine a percent chance of rain/snow/etc?

It's statistical. They observe the developing weather conditions and gather data like wind, temperature, humidity, pressure etc. And then they compare that data to historic weather conditions to estimate what pattern is the best fit. Based on how the data lines up, they can basically say "there's a pretty strong chance of rain this afternoon, because the last time we saw this data, it rained". Percentage points are crude estimates, and not usually precise.


Question: What is eczema? I know allergies affect the severity, but what is happening the body to create it?

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 What is eczema? I know allergies affect the severity, but what is happening the body to create it?

Eczema is an autoimmune reaction. Your body is allergic to its own skin cells and mistakes your own skin cells for attacking cells. So it does what it would do if you had poison ivy, or some kind of irritant. It releases histamines which cause swelling and redness and triggers a “scratch” reflex to try to get the attacking substance off. You scratch the area and it triggers more histamines and breaks the skin making it flaky and coarse.


Question: What is it specifically about an environment that will trigger that feeling that you’re being watched?

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 What is it specifically about an environment that will trigger that feeling that you’re being watched?

The feeling of someone staring at you or being near you when you are alone is a psychological misperception and mirroring of your own body’s actions. Normally, our bodies can differentiate between ourselves and others, but every so often, things get a little mixed up. There is a primitive part of your brain, its called instinct, you emphasie other people's gaze because we are social creature and people gazing at you could mean they want to communicate or socialize with you. this instinct usually iss fantastic, but as with all biological system, sometimes, mixed up happends, and they will generate these "six senth" feel of being watched. which when you are lone in the woods, is more than uncalled for.


Question: Why do colleges care about legacies? How does having parents or grandparents who are alumni of a certain university make the student a more qualified candidate?

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 Why do colleges care about legacies? How does having parents or grandparents who are alumni of a certain university make the student a more qualified candidate?

Colleges thrive on gifts from alumni. If they can establish a family as loyal alumni, they can ensure a steady stream of donations. This is the cynical view. A more optimistic view is that colleges love passing down traditions, and having multiple generations of a family go to the same college further embeds that sense of identity and tradition. In reality, both explanations probably play a role.


Question: How does "hardness" work in regards to things like diamond?

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 How does "hardness" work in regards to things like diamond?

Hardness and toughness are different things in mineralogy. Hardness specifically refers to the ability for one substance to scratch another. Something can only be scratched by something else with the same or higher hardness. Diamonds are actually quite brittle and will crack, chip, or shatter easily enough that you should get insurance on your engagement ring stones. It will not, however, get scratched. Not by anything other than another diamond.


Question: If you gave a monkey a typewriter and infinite amount of time will he eventually type shakespeare?

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 If you gave a monkey a typewriter and infinite amount of time will he eventually type shakespeare?

Let's say Shakespeare wrote an early play called A. That's all the play consists of, the letter A. Typing randomly, there are only 26 combinations, so the monkey will eventually hit the A key, and reproduce Shakespeare's play. The play A received poor critical reviews, so Shakespeare tried again with the play BC, which, as you might guess, was only the letters BC. There are only 676 two letter combinations, so given enough time, the monkey will also reproduce that play. This also true for all of the 17,576 three letter plays, the 456,976 four letter plays, and the 11,881,376 five letter plays. There are approximately a million words in the complete works of Shakespeare, at about 5 letters a word you have 5 million letters. That's 26^5,000,000 possible combinations, roughly a 5 followed by 7 million zeros. That is a ridiculously huge number, bigger than the number of atoms in the universe, but we are talking infinity here. Note there is nothing special about the works of Shakespeare in this case, that monkey will eventually construct all possible combinations. That means Shakespeare, Shakespeare where Hamlet says "To see or not to see" instead, Romeo and Gertrude, and all the other minor variations on Shakespeare you could imagine. The monkey types Shakespeare because it eventually types everything that can be typed.


Question: Why is it quieter when it snows?

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 Why is it quieter when it snows?

Sound travels in waves yeah? Well sound bounces off of structures to get to places. Off of the ground, buildings, etc. When it snows it adds a layer of snow, which usually isn't packed tightly, so it doesn't reflect a lot of that wave back as well. It's like hitting a baseball with a wooden bat verses a pool noodle.


Question: Why are there warm and cold spots in bodies of water when out swimming?

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 Why are there warm and cold spots in bodies of water when out swimming?

Not an expert, but any chance you were swimming in a lake? There is a phenomenon known as "lake turnover" where the deeper (colder) water rises to the surface. This mostly happens in the summer because of the differences in density between the hot surface water and cold stuff down below.


Question: why do people censor their license plates on the internet?

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 why do people censor their license plates on the internet?

It's a form of identification and people can search your tags if they want if you know the right person. Like my friend is a 911 operator say if I had your tag and I wanted to harass you I could get your address and whatever else that provides by just having your tag. It's just a necessary precaution in today's world.


Question: What slows down computers and phones over time and why won't a memory clear restore them to their former glory?

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 What slows down computers and phones over time and why won't a memory clear restore them to their former glory?

The hardware does not get worse, slowdowns happen because of software changes or just your own expectations causing a placebo effect. If you continue to update software then new versions are harder to run. This is because new computers have excess power to be able to run these more difficult programs. People who write the programs want to include new features and these new features require more work from the computer. For mobile devices, it could be different. Manufacturers have more control over the OS and can intentionally slow them down. Also, due to the power restrictions of using an old battery, it is possible that processing power must be limited to prevent energy problems. I believe the iPhone did this.


Question: Why do some books have deckle (jaged) edges and others are smooth?

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 Why do some books have deckle (jaged) edges and others are smooth?

Today, it's a style choice. In ancient times, books were printed in folios by folding the big sheets that came out of the press. These folios were stitched into a binding and sold that way. The edges were folded, so you couldn't read the book, but this kept them clean in shipping. When you got you new, expensive, book home you took out your pen knife (which you had on your desk to trim the feather you were dipping in ink to write with) and carefully slit the folios open so you could read the book. This produced the uneven edge effect. Today, there are hydraulic paper cutters that can cut thousands of sheets at a cut, but the old look is still more prestigious. So, there are special cutter machines that maintain that result.


Question: Why do gas stations make you go inside if there's less than $100-$200 on your debit card?

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 Why do gas stations make you go inside if there's less than $100-$200 on your debit card?

I've never had that happen, and my debit card has had less than that before. However, I'd assume it's something to do with putting holds on your account. I got gas once at a gas station and they placed a $50 hold on my account (I only got $20 worth of gas), the difference was refunded a few days later


Question: Why are Americans annoyed about the Superbowl 1/2 time show? And why is it about SpongeBob?

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 Why are Americans annoyed about the Superbowl 1/2 time show? And why is it about SpongeBob?

Stephen Hillenberg, the creator of Spongebob, passed away last year. In the show, there’s an episode where they perform the song Sweet Victory at the Super Bowl, and it’s considered one of the best moments of the show. There was a social media movement/meme thingy to have Sweet Victory played during halftime at the 2019 Super Bowl. Fast forward to today, they teased the song by showing a clip from Spongebob but not actually playing any of the song. I think people are upset bc they expected the amazing moment of Sweet Victory played at the Super Bowl, and were sorely disappointed


Question: why do people with Down syndrome have the same body features changed, is it directly caused by the missing chromosome?

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 why do people with Down syndrome have the same body features changed, is it directly caused by the missing chromosome?

Individuals with Down Syndrome have a trisomy of chromosome 21. Meaning they have a an extra chromosome 21. For simplicity as to how this happens, I've copied an excerpt from URL_0 : "Normally in reproduction, the egg cell of the mother and the sperm cell of the father start out with the usual number of 46 chromosomes. The egg and sperm cells both undergo a cell division in which the 46 chromosomes are divided in half, so that both the egg and the sperm cells will have 23 chromosomes each. When a sperm with 23 chromosomes fertilizes an egg with 23 chromosomes, the baby will have a complete set of 46 chromosomes, half from the father and half from the mother. Sometimes, an error occurs when the 46 chromosomes are being divided in half, and an egg or sperm cell keeps both copies of the #21 chromosome instead of just one copy. If this egg or sperm is fertilized, then the baby will have three copies of the #21 chromosome, which is called trisomy 21, or Down syndrome. The features of Down syndrome are caused by that extra copy of chromosome #21 being in every cell in the body. " The theory as to why these traits are commonly expressed between individuals with down syndrome is that the presence of an additional chromosome can lead to over expression of traits within chromosome 21.


Question: How do rotation matrices work in computer graphics?

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 How do rotation matrices work in computer graphics?

If you have some time, I highly reccomend watching [3b1b's series on Linear Algebra]( URL_1 ). At least watch just [the video on Linear Transformations]( URL_0 ) . Which explains why transformation matrices look the way they do (including rotation matrices). The rotation matrix tranforms a vector (x,y) by rotating it θ radians. But here's another way of thinking about it: The columns of the matrix tell you where the basis vectors land *after* the transformation. This is true in general, not just rotations. In 2D you have the two standard basis vectors: (1,0) and (0,1). So if you want a rotation by 90 degrees, then the basis vector (1,0) turns into (0,1). And the basic vector (0,1) turns into (-1,0). So the matrix that describe a 90 deg rotation looks 0 -1 1 0 However in genera we want to rotate by θ. If you want to rotate the vector (1,0) by θ, then after the rotation the coordinates of the vector will be (cosθ, sinθ) < -- This comes from the unit circle. This is the first column of the rotation matrix. Similarly, if you rotate (0,1) by θ, the resultign coordinates is (-sinθ, cosθ) which is the second column of the matrix.


Question: Why does a white substance appear when glass is cracked or shattered?

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 Why does a white substance appear when glass is cracked or shattered?

Hey OP. I think I get the jist of your question, but let me know if I misunderstand. When you crack a glass, you'll often see some white along the break lines. This is because the light is now refrecting differently within those areas. It is bouncing around more, and obscuring your ability to see through it. So, it's not so much a substance as a change in the way the light moves through the glass.


Question: Why was Rasputin the villain in the animated movie Anastasia?

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 Why was Rasputin the villain in the animated movie Anastasia?

It was due to his role as a mystic and the general dislike those outside of the royal family had for him. Some speculated he had an “influence” over the royals. It could be argued the dislike for him helped to ruin faith in the tzars and helped power the overthrow of the government. Keep in mind a lot of the information about him is hearsay and it’s hard to historically validate the claims of his reach. From a writer point of view these are the perfect makings of a villain, especially when the movie moves to set the royal family in a more positive light. It’s simpler to say he had it out for them and spurred the problems instead of long brewing socio-economic issues.


Question: How does Bayesian statistics work and what is it useful for?

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 How does Bayesian statistics work and what is it useful for?

Consider the following hypothetical: After your last checkup, your doctor tells you that you tested positive for a very rare disease. The test that they used is correct 99.9% of the time. What are the odds that you have that disease? At first blush, you might say "99.9%". However, if that disease is present in 0.1% of the population, then a random testing of 1000 people will yield 1 true positive result, and 1 false positive result. If all you know is that you test positive, you could be either, making your odds around 50%


Question: How do animators know, how much content they have already produced?

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</answer>
 How do animators know, how much content they have already produced?

That all happens in the writing room. The script writers plan the episodes and figure out the lengths of each episode. They plan it into those 20 minute blocks for the most part, rather than the other way around. For instance, writers will come up with the big picture story they want to tell over the course of 13 or 22 story beats. Each of those beats becomes an episode. The writers then come up with the correct number of smaller stories to fit in these episode blocks (some may be 2 parts). Then they figure out how to write those stories in a 20 minute block. By the time it gets to the animator, the writers know exactly how it should be, and the dialogue has been recorded. The animators just have to make it into reality. Before creating the finished animation, the animators will work with the writers to make story boards that detail how each scene will go in a basic way (shots, angles, etc) and the duration so everything is planned perfectly.


Question: Why does “cleaning” our ears with a cotton swab feel so good when we’re told not to put anything in them?

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 Why does “cleaning” our ears with a cotton swab feel so good when we’re told not to put anything in them?

Because you are touching the Vagus nerve. It's a cranial nerve and one of the longest in your body. It controls a lot of stuff, like heart rate and swallowing. Stimulation to this nerve can feel good! To the point that some women have reported to had orgasms from just stimulation to the Vagus nerve. This nerve is also the reason why touching your breasts and armpits can feel good, or makes you giggle.


Question: How are televisions in showroom in perfect sync ?

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 How are televisions in showroom in perfect sync ?

There is a huge difference between having multiple monitors on a computer with different output on each like if you use a computer compared to duplicate a signal to multiple display. There are HDMI splitter boxes that take the input from one cable and send out the same signal to multiple monitors. A quick search on amazon resulted in 1 to 8 splitter for $50 and you would need 5 of those to drive 36 screens for a total of $25 . URL_0 The input to the TV will be in sync and as long as you disable any post processing often by using a game mode on the tv they will have as little delay as possible and all screens are in sync.


Question: Why do certain musical notes harmonize?

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 Why do certain musical notes harmonize?

It's the relative position of the peaks and troughs of the wave form. If a second pitch has a waveform that will align a peak frequently, then the sound is considered pleasant. Two notes that are dissonant would have peaks that only aligned after a great number or cycles, which is why dissonant notes have different rates at which they "warble". Not the most eloquent answer, but that's basically it.


Question: How do animators sync up their characters talking with audio?

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 How do animators sync up their characters talking with audio?

actual animator here: experience and timing. if you do as others in this thread say and just plug in whatever lip shape happens for whatever sound you get terribly ugly uncanny valley lip sync. It looks terrible and fucking creepy, it looks unprofessional and slapped-on. What mouth shape you think there'd be is not actually what would be there. The shape you'd use to make one sound in one instance, is not the same elsewhere. there's like 4 different ways to do an "eeeeee" noise, that changes in context to the dialogue it's in. An animator's talent lies in their ability to see how people actually move, not how they think they move, but also vice versa, so by compounding this experience and observation we animate characters- including dialogue- to look the best it can not just realistically but have it "feel" good as well. but the vast majority is just a large amount of eyeballing it with expertise and experience.


Question: How does a polygraph measure whether someone is lying?

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 How does a polygraph measure whether someone is lying?

They don't. It measures things like breathing rate & pulse. It only detects their body's functions. They ask questions to which the individual is instructed to tell the truth or lie so they can calibrate it. Loosely they watch for an adrenaline reaction when someone lies. Genuinely believe the lie, It won't work. Cause yourself pain when telling the truth it muddies results. Operators are what matter and even then nothing is definitive. Polygraphs can be beat, give false readings, or be interpreted incorrectly.


Question: What is Health Insurance Death Spiral?

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 What is Health Insurance Death Spiral?

Health insurance firms cannot price discriminate against people with pre-existing conditions, despite them being more costly to cover than someone without such conditions. The ACA made covering these people possible by mandating that everyone, including healthy people who are cheap to cover, buy insurance. If young, healthy people drop out of the insurance market, the average person being covered becomes sicker and more costly. Due to the pre-existing conditions rule, these costs are spread across all insured people in the form of higher premiums. These higher premiums then cause more people to opt out of buying insurance. The people who opt out tend to be the younger and healthier people who have less to gain from coverage. This makes the problem worse, causing more and more people to drop out as premiums increase, leaving only the very sick insured at very high cost, while no one else can afford insurance. While this has, to some extent, occurred since the passage of the ACA a result of how easy the tax for not having insurance was to avoid, how low it was at first, and the fact that it was effectively repealed, it turns out people have tended to still want insurance, by and large, even as the youngest and healthiest have dropped out at reasonably high rates. There are a few reasons for that, such as the employer health insurance mandate (employers with more than 50 employees must offer a plan) being maintained, the ACA's essential health benefits (dictating that insurance must cover particular things) making coverage more valuable, the ACA's subsidies for low earners, people not liking the risks associated with being uninsured, and general economic recovery. By and large talk of a "death spiral" in insurance markets is not nearly as common as it was.


Question: How will the guy that paid 3.1mill for a Tuna make profit from that?

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 How will the guy that paid 3.1mill for a Tuna make profit from that?

See tuna are giant fish, they are one of the top predators of the ocean in fact, so these boys get huge. Some get 300+ lbs. what they do is turn it into sushi, and I’m guessing it must’ve been a giant tuna the dude bought. But you can usually get between 3,500 -8,000 dollars per lb of tuna when you sell it as sushi though.


Question: Why do favourite things exist?

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 Why do favourite things exist?

It comes down to biology. Things that are very good at satisfying a need, nutrition, hydration, or hunger, often trigger flags in the brain that say "Hey, this is good do that again." Well Humans have evolved in a way that social needs are now survival needs. So when you hear music you like, your brain marks it as something to return to. Is there a color you like seeing, now it's your favorite. So because being happy is just as nessecary as being healthy, things that make you happy are marked in your brain the same way food that makes you healthy does.


Question: Why do softer things like blankets feel warmer than things like rocks?

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 Why do softer things like blankets feel warmer than things like rocks?

When something feels hot or cold what you are actually feeling is the heat entering or leaving your body. So two objects at the same temperature might *feel* different against your skin depending on how easy it is for heat to flow between your body and the object. It's very difficult for heat to flow between solids and gases. Heat moves from one object to another mostly when the hot atoms hit the cold atoms and pass some energy over. (for the science nerds: yes I'm excluding radiative transfer since it's not the differentiating mechanism between OPs examples). Since atoms are further apart in gases, there's not a lot of gas atoms colliding against the solid object's atoms. However, heat flows better between solid-to-liquids, and solids-to-solids. That's because the atoms in solids and liquids are packed together, so they hit each other and pass around energy really well. Things like blankets, coats, and the insulation builders put in your house's walls, are filled with tiny air bubbles. That means for heat to flow through them, the heat has to pass from solid to gas to solid to gas to solid... Which is really hard to do. So not much heat leaves your body through the blanket, which makes them *feel* warm. Additionally, since your body continuously generates more heat, you can actually build up too much heat between you and the blanket since so little heat is leaving (this is why you might start sweating while wearing a winter coat even if it's freezing outside). However, if you touch a solid or liquid, such as a rock or water, which are at the same temperature as the blanket, they will *feel* colder because more heat will leave your body because heat flows better from solid-to-solid and solid-to-liquid. On the other hand, if the rock, water, and blanket are hotter than your skin, the rock and water will feel very hot compared to a blanket because more heat *enters* your body through the solids and liquids. This is why it's easier to burn yourself on hot water or metal than with hot air. This is also why you can freeze your tongue to a metal pole when it's cold outside. Sticking your tongue out into freezing air doesn't freeze your tongue right away because the heat flows too slowly (your body's heat generation can keep up). But, when your tongue touches the metal, so much heat leaves the tongue that it quickly freezes tight against the pole.


Question: How is the Senate able to write their own healthcare bill? What happens to the AHCA that was passed in the House today?

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 How is the Senate able to write their own healthcare bill? What happens to the AHCA that was passed in the House today?

The senate and the house have to agree. The house can pass a bill and submit to the senate to sign off on identically or vice versa. Or, and more likely, one chamber can pass a bill and submit to the other, and the other will make modifications, and approve it. Then the modified bill goes back to the originating chamber for agreement on them amendments. So here, if the senate approves with modifications the proposed modified law must then be approved by the house, despite the original bill orgimatimg in the house. Got it?


Question: How do birds go forward when flying if their wing movement makes it look like they would only go upwards?

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 How do birds go forward when flying if their wing movement makes it look like they would only go upwards?

The flapping motion itself is generally used to build or maintain height. However, with the angle and shape of a birds wings, a bird can adjust its tilt slightly while flapping or gliding to build forward momentum. The forward momentum builds as the bird tilts forward, and will accumulate as the bird flies through the air. Birds can adjust the angle of their wings to flap with a combination of upwards and forward momentum.


Question: How does a modern laptop have the same/more horsepower than a much chunkier games console without a built in display/trackpad/keyboard?

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 How does a modern laptop have the same/more horsepower than a much chunkier games console without a built in display/trackpad/keyboard?

Making things smaller costs more money. Consoles are primarily designed to be cost effective. Allowing more space for cooling & components allows them to keep the costs down a bit. They also need to have oversized cooling systems to deal with the poor environments & lack of maintenance they're likely to experience.