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|---|---|---|---|
btd45m
|
Why does the sun appear to move visibly quicker at sunset and sunrise?
|
Because you have a fixed object (the horizon) as a reference point. When the sun is high in the sky, it's hard to tell how fast it's moving because there's nothing around it. When it gets close to the horizon, it's easy to see its motion compared to something else that's not moving.
|
bcb87512-945d-4b0b-bbe8-f4c3b010fba7
|
btduyl
|
what muscles are responsible for the cringe sensation? Why does your body react the way it does when such an event occurs?
|
It's a physical reaction to an emotional trigger. The whole 'cringe' thing is sympathetic embarrassment, as we put ourselves in the subject's place and imagine how we'd feel in that situation.
|
460f2f40-c90d-4e4e-9e24-d55fc66a4769
|
btdy4j
|
why do children tend to prefer sweet food where as when you get older you usually start to prefer savory food?
|
As I grow up I lost lust for pastry, ice cream, candy, cake... But man, chocolate, its something different. It reached tobacco addiction level in me.
|
d507fa8a-38a2-49f4-9a96-4277f6d673c2
|
btdz3o
|
Why do the wealthy benefit from welfare?
|
We have a system where somebody had to do all the crappy jobs but we dont want to pay a lot. Welfare allows people to just kind of scrape by while doing those marginal jobs. For instance a large percentage of Walmart's hourly employees rely on welfare to make ends meet. Welfare represents a cut rate way of maintaining a slave class.
_URL_0_
|
fc910b14-ca65-462e-ae46-ff6908b74b11
|
bte3b6
|
Why does hot tap water sound different than cold tap water?
|
They have different densities so the cold water is lower pitched than hot water because sound vibrations travel through the hot water more easily.
|
9c914d94-51c3-42e2-9d88-e94d100a4c76
|
bte8gv
|
How does the scam in the Wolf of Wall Street work?
|
The pump and dump scheme? I've only seen the movie once when it first came out, but I'm pretty sure that's what it is. Basically you buy a crapload of low value stocks and create a buzz, causing others to buy which increases the price. Once it hits a certain point you sell all your shares at a profit. Its market manipulation which is illegal. I'm not a lawyer though so I may be wrong.
|
90511232-f9df-495b-85d0-b9c540b251c8
|
bteddo
|
When does it become archaeology instead of grave robbing? Does it have to be from a certain era or is there a set amount of years that have to pass or something?
|
It's archaelogy when you have permission from the relevant authorities, and grave robbing when you don't. Each government sets it's own rules, which might or might not consider the age of the site.
|
8450fcbc-04ff-4016-8b84-6fb2afe762c1
|
btedmn
|
What’s the difference between dish soap and hand soap?
|
Different pH values and oil additives/perfumes. That’s it.
You can use dish soap as your only soap, and just add a bit of baking sofa or vinegar until your skin is happy.
The actual soap is the same for all soaps - one end binds to water, the other to oil.
|
ddb7be62-5439-4cce-a22f-1bbc15eddb3b
|
bteof1
|
Why do frozen, raw chicken products keep getting recalled for salmonella? Wouldn’t the solution be to cook the product properly? All raw chicken could contain salmonella.
|
There are two normal issues governing a recall due to salmonella. The first is the actual loading or the amount of salmonella present, so there isn't a recall if there is some salmonella, but if there are substantial amounts of salmonella. The second is if the salmonella is an anti-biotic resistant strain.
|
02e77149-a2cb-42e0-908f-011633fafe54
|
btesif
|
What colour do blue lobsters turn when cooked, and why?
|
They still turn red, but you'll see a tiny, tiny bit of blue in the Shell lines. They taste the same as a regular lobster. You can get many color variations, inclusing calico blue/orange split.
|
820b36c6-3652-4402-b525-12aa8e6db3be
|
btf3f4
|
How and why does the hairs on your body stand during different conditions?
|
The skin is not a perfectly smooth, continuous surface even though it may look like it. When you look very closely, you'll notice little dots called pores. Skin pores are linked to sweat glands under the skin, which are parts of your skin that produce sweat (which contains water) and release it onto your skin. Once on the skin, the sweat evaporates into the air, giving a cooling effect for your skin.
Now water is also used in the body in reactions that generate heat, which are important in keeping you warm when it's cold outside. So you don't want to lose any water when you're cold.
In parts of the body where hair grows, some of the pores have hair coming out of them. These hairs usually lie flat (on your arm for example) but stand up when it's cold. This closes off the skin pores, preventing water from being lost as sweat, meaning that you have more water to use to generate heat (and no water is used to keep you cool by sweating).
Hairs also stand up when you're scared or get goosebumps. What these 3 have in common is that they all cause you to shiver, which causes blood vessels to become temporarily narrower to reduce the heat lost from blood.
The way the hairs stand up is that they are attached to these small muscles next to the sweat glands, called "arrector pili" muscles. These will contract in response to shivering and cause the hairs to stand up.
|
34d65e64-230a-4af5-b7a6-49e0385b8b48
|
btf8fp
|
How does the voice of performers like Michael Buble come across so evenly despite the varying distance between the microphone and his mouth?
|
Great vocalists have impeccable mic technique. When he’s pulling the microphone away his voice is louder. And when it is closer his voice is softer.
|
b1c1947e-4523-47ff-a2f7-88ebb9b95611
|
btfh0t
|
what is the difference nutritionally between artificial and natural sugars, like why are the sugars from my apple any better for me than the sugars from my apple lollipop if it’s all still sugar?
|
Well there's not a chemical difference between the fructose in the apple and the fructose in the lollipop. There are two reasons the apple is better for you. 1. The apple has some vitamin C and probably others 2. The apple has dietary fiber and other complex carbs, which will lead to a smoother blood sugar curve than if you ate the same number of calories in lollipop form.
|
eb8d4f50-71da-4b36-ad8d-8b3bd26fdfc7
|
btfklj
|
why are areas where your skin was cut or scraped get hot later?
|
Those areas turn hot and red because blood is being directed to the site of the injury, both for clotting reasons (blood contains platelets which mediate clotting) and immune response reasons (blood also contains white blood cells, which mediate the immune response).
|
f8289d99-b2ba-4ca4-86cb-e7234db542a0
|
btfohc
|
When a human is buried in a coffin, what actually happens with the dead organic matter?
|
depends how much embalming fluid there is in their veins. generally, after 10 years there's a lot of liquid in there, recognizable skin and bones lots of hair and a dank smell. if the coffin leaks and doesn't flood they get leathery but if it collapses its usually just dirt and bones. i woked at a cemetery. people move and a lot of times they want loved ones exhumed and cremated. the dead travel better as ashes. one time we dug up a teenaged overdose victim from the 70s. her father was retiring to California and wanted her near. she was perfectly preserved and still beautiful.
|
bb713df6-1bc3-4230-83f4-317d4f692d5e
|
btfvj4
|
Why does the brightness of road tunnel lights change in intensity and colour in some tunnels as you drive further in. A tunnel I went through tonight started with very bright yellow lights as I entered, then transitioned to dimmer white lights by the time I got to the end of the tunnel.
|
It's a safety feature.
When you go into the tunnel, it has to be so bright inside the tunnel that you automatically perceive it as well lit up. This bit is more important during the day when you can have trouble seeing anything inside a tunnel that is too dark, but matters at night too.
In the middle of the tunnel, there is really no need for that much light, so it's dimmed down. Or simply regulated by installing the fixtures further apart.
As you reach the end of the tunnel, the light is gently toned up again. Well. During the day, that is. Because when you have been inside the dim lit tunnel for a while it'll be difficult to adapt to the brightness of full sunlight outside again.
If you look carefully, you notice that even a tunnel in an area with no street lights at all got some streetlight or a while right before and right after the tunnel. To make the transition easier for nighttime drivers.
You can do pretty advanced stuff with this if you really want to, but all it takes is that you have a bAW set of fixtures in the tunnel that operate at a fixed rate and a handful around each opening that you either dim or turn on and off depending on the readings of a lux meter just outside the tunnel.
|
d98773c2-4f6e-4d22-911c-0557c23c4f11
|
btfvx7
|
What are our bodies actually doing when we "suck in" our gut?
|
Your “gut” ie your intestine is very soft. So when you contract your abdominal muscles, they push your lower abdominal cavity back. As well, you may notice you breathe in when you preform this. There is connective tissue all over your upper and lower chest cavity, when you breathe the diaphragm moves some other things with it
|
3d04eec3-5739-48ee-a17c-ae01a1a3f07a
|
btg1f7
|
How do whales sleep without drowning?
|
apparently they don't really sleep, it's more like napping...
[_URL_0_](_URL_0_)
|
cdd72b55-5896-4dbe-9868-7d86846a7efd
|
btg2bg
|
why there is a concept of article in most of the romance languages while there is no such concept in Latin.
|
It's been a while since I studied r/latin, but my understanding is that the definite articles in the modern Romance languages (and possibly also “the” in English through Roman contact with various Germanic tribes) are descended from *ille, illa, illud* in Latin.
|
6da0e432-0639-48b9-a121-0efc3f9260e8
|
btg4pz
|
How come even when a part of your body is missing (like my dad’s big toes), you can still feel “phantom pains” sometimes?
|
So nobody is entirely sure. There are a few theories though.
One theory is that the your brain does a check on your body and when it notices something wrong it causes pain to be with what used to be your arm for example.
Another theory is that say you lost an arm your brain re wires the nerves to a different area on your body say your calf. And when you calf is touched it thinks your arm was touched.
|
3d38b7ec-a962-4cbe-a9ba-d4bcd2a7e196
|
btg53u
|
what is a zero-sum game?
|
A game where all the value is in play at the beginning and none is added or created as you go.
If we're playing poker, just the two of us, then every chip you lose i gain that exact chip and every chip i lose you gain. At the end of the round there are exactly as many chips on the table as there were before the round. If you add up all of my gains and losses, then combine that with all of your gains and losses it will all sum up to zero.
Now if we're playing something different, like Monopoly, it may be a non-zero sum game. In Monopoly you can lose money to other players and if this were the only way money changed hands it would be zero sum; however, you can also lose money to the bank or earn money from the bank(crossing start) which means that at the end of the round you can finish with a lot more money in play than was dealt out at the beginning making monopoly a **Non-Zero Sum Game**
|
4171ff8e-3f5d-4627-a4e1-089bbcdd99ea
|
btg6m1
|
How inflation works.
|
One way is what you usually hear, if you have too much supply of money, then naturally the price of each of those dollars decreases.
That's because inflation is usually in the context of super hyper-inflation.
But inflation also arises naturally. In fact, it arises when the economy is *growing*. That's why inflation is a positive indicator of the economy. It's also why we had deflation during the Great Depression, or disinflation during the Great Recession.
*If you don't have inflation, yu dun fucked up*
When aggregate demand in a country increases, prices do as well just because of supply and demand. Which is the definition of inflation: **an increase in prices**
|
e9d2c7c6-aa42-4cc8-8878-4f0b0811e482
|
btg9ro
|
what are hangnails? And how do they form?
|
Hangnails are just torn skin around your fingernails. Usually happens when your skin is dry or when biting your fingernails. To prevent hangnails, try to keep your hands hydrated in the warmer months and avoid biting your nails. Most of the pain comes from trying to rip them off. The hangnail sometimes makes your finger swell, which would hurt more when pulling them off. It’s also a bad idea to bite them off, since tearing them off exposes skin and leaves you exposed to infections. Your mouth is full of germs and could lead to infection.
TLDR: They’re thorn skin and hurt when you pull them off. Keep your hands hydrated to prevent more.
|
315a26b9-2318-46b2-80e1-58f321963275
|
btgbl3
|
Why do some open world games have minimal or no loading screens while others are heavily invested in them as the player moves from one area to another?
|
It's a choice by the game company. There are ways to load the next area while you're still playing, but doing this is often technically complicated and requires additional time and therefore money. It's easier to just show a loading screen.
Games that invest in smarter loading often do it because it's a key part of the user experience they want. Other games would prefer to spend that effort on other features and content.
|
3011158a-94b3-466d-8b2f-2ba009637c29
|
btge36
|
Why don’t bullets hit below where someone is aiming?
|
You can adjust the reticle up/down/left/right to compensate for this. That way at a certain distance your shot will land where pointing.
|
7f02fcf0-7f69-4118-8742-c8d1eaaea16d
|
btgmzn
|
How exactly do faucets work? They look like saxophones so how does water go up the pipes?
|
Water pressure: either from a pump or water tower creates pressure and makes water come out the faucet
|
d9f75a36-5b24-4200-a7b3-0444f96a354a
|
btgugg
|
If bugs are attracted to bright lights, why don’t they fly towards the sun during the day?
|
They’re not naturally attracted to lights; they evolved to use the Sun and Moon for navigation. When they fly past an artificial light source, their tiny brains think they’re off-course, and they turn towards the light to compensate.
|
804a4e6f-8a16-4bf5-8afb-ec11d14fda25
|
btgyoc
|
What are some signs that someone has a personality disorder (sociopathic and such)?
|
Personality disorders are really serious and shouldn’t be taken lightly. Symptoms would need to be continuous and persistent.
some of them include a fear of being unstable, funny enough. You might be constantly worried there’s something wrong with you. you could also get paranoid to an incredibly stressful point and find it difficult to tolerate being alone.
EDIT: Added this to a reply below but i’m adding here to make it more visible. If you’re worried about your mental health there’s nothing wrong with checking in with a professional same way you’d see your doctor if you thought you had strep throat
sure, it could just be a sore throat, but it could be something more problematic. in the same vein, sure you could just be having difficult feelings right now, but you could also have some other potentially more concerning issue
|
50070ec5-4a5c-4255-bbad-8aaa3c87c6d0
|
btgyon
|
If the universe is expanding, do planets get smaller the further away they are from where the Big Bang occured?
|
There are a few misconceptions here, but let me start by saying I'm not a cosmologist nor am I an astronomer.
First: the universe has no center, there is no point from which the universe expanded, that point has become the whole universe.
Secondly: This expansion occurs nearly everywhere. The places where the universe doesn't expand are places where gravity is acting with some certain intensity. Planets dont expand because the force of gravity overcomes the expansion. Whereas the space between galaxies or galaxy clusters (I assume) has sufficiently weak gravity that the expansion can take place. This is why the solar system is not noticeably expanding.
I dont think an explosion is a great model for the big bang, although I struggle to explain why or give a better example. Additionally the amount of mater in existence at the time of the so called big bang is not necessarily the same as what exists now, because mass and energy can be converted between each other, so where objects with mass began may not exactly reflect the state of the universe now.
As for the endless void I think the current school of thought is that there will be islands of mass (galaxy formations) that will be separated by an ever increasing void.
Again I'm not an expert in this so if this gains traction and someone who is formally educated in this, or just knows a lot about it is bothered by any inaccuracies please feel free to point out any shortcomings.
|
01f78f7e-d027-4bcb-befe-f12dcd16a85a
|
btgyzq
|
Why does the light at sunrise look so different from sunset?
|
When the sun is rising you're getting indirect, diffuse light which is slowly and steadily increasing, as the sun gets closer to the horizon - going from black to blue. It happens the exact opposite when the sun is setting. Direct light becomes indirect and diffuse, turning from blue to black.
They don't actually look that different, just mirrored. But that's enough to make it seem very different. If someone showed you a still picture of dawn twilight and dusk twilight without labels, you wouldn't be able to tell which was which
|
00d793f0-f04b-4437-9b7e-4e2a2f6b6edb
|
bth3p3
|
What happens to the skin when it burns and why does it blister ?
|
Heat breaks down the cell walls causing them to burst. Cells are little sacs of fluid. When the cells burst, either by burning the cell wall or boiling of the intracellular fluid, the fluid accumulates in the spaces between the cells. TA DA! A blister
|
c146b7af-da61-44f0-b085-51cc2b3d9ad5
|
bthaox
|
What are the chemical properties of Instant Mac and Cheese that makes it cook that quick? AKA how does the cheese work with the white powder to thicken the liquid?
|
The noodles are just freeze dried, they're fully cooked. They simply need water to rehydrate them, which only takes a few minutes. No other chemical magic is necessary.
|
3bb1236a-5e30-40f1-8daf-d362d7ee56f4
|
bthxym
|
Is there any point in having 2 separate nostrils? why don’t we just have 1 large intake hole instead of 2? Wouldn’t it be more effective?
|
The nostrils are for warming, humidifying, and filtering the air we breathe. Having two increases the surface area as well as allowing shorter hairs for the filtering process.
|
7fba405e-8b2d-4125-84a2-11fea82bc52c
|
bthytz
|
Why does pressing harder on a TV remote with near flat batteries, seem to work better?
|
As the batteries die, they push out lower voltage. The buttons are basically conductive dots that bridge a contact under the button and complete a circuit, making the led flash in a certain way to tell the TV what to do. Pushing harder can make a better contact, allowing the led to light up \ flash brighter when the batteries are low.
|
b617d397-01ed-4846-8810-4f35500d1f8b
|
btiawf
|
How are amputees able to control and move prosthetic limbs right out of the box?
|
There are two kinds of prosthetics. They both have different goals in mind. For example, a cosmetic prosthetic limb, called a cosmesis, is designed with appearance in mind rather than controllability. Advanced plastics and pigments uniquely matched to the patient's own skin tone allow a modern day cosmesis to take on an amazingly life-like appearance. Even details such as freckles, hair and fingerprints can be included, bringing the cosmesis to the point where it's nearly indistinguishable from the original missing arm or leg.
Other prosthetics are designed to actually be somewhat of a replacement in functionallity for the amputee.
I think your question aimed at the prosthetics that aren't body powered and appear to have a mind of their own.
These devices actually listen to muscles remaining in the residual limb that the patient can still contract. Because muscles generate small electrical signals when they contract, electrodes placed on the surface of the skin can measure muscle movements. Although no buttons are physically pressed by the muscles in this case, their contractions are detected by the electrodes and then used to control the prosthetic limb. Scientific term is myoelectric prosthetics;)
I hope my answer could help.
Have a good day!
|
4f3b4fd1-4594-4116-a5a3-783e0c7d88a7
|
btiiz2
|
why do people sell their things to pawn shops when they can sell it to auctions for a much better price?
|
You sell to a pawn shop when you need the cash right that second. You are facing eviction or want to keep the power on or need to buy drugs. It's for when you haven't got time for an auction.
|
29bcd573-e359-4123-a18f-10cc41964f70
|
btilt8
|
How does a tracking device like a Garmin watch or Strava mob app know what elevation you are, no matter where you are?
|
It's just GPS, because of the way it calculates your location it always knows your altitude too, not just latitude and longitude. Flat street maps just don't show it, because it's no use to you.
|
89761953-f946-4fb6-aa2c-6dcd40667364
|
btimsv
|
Why does the body need to be trained for cardio? What does your body do when at first u can’t run 1 mile but after a while u can run 10?
|
None of the three answers yet actually address the question, IMHO. I’ll take a stab at it:
Your body’s constantly trying balance a bunch of finite resources. If your heart doesn’t need to pump much blood all the time, the energy to maintain the heart muscle to do that would be better spent somewhere else. Cardio training (and all other muscle training) is just telling the body that it needs to start devoting some of its resources to those muscle groups now.
|
683fce0d-ee95-4c64-9d8b-0886383d9727
|
btiurv
|
Why do videos from the early internet have such weird audio quality?
|
Bad, early file compression algorithms.
Back in the day average internet speeds were very slow compared to today, and the need for small file sizes combined with early compression algorithms, leading to a serious loss of detail.
|
09d0f60d-07c1-427d-9ee8-b19626c73111
|
btiy9s
|
How knockoff or off brand toys/items are manufactured and actually end up in stores in the west
|
Most items are made in China. Usually the factory that makes them have all the tools to make more and sometimes after the brands order has been filled they're left with raw resources so they'll make their own batch and sell it to make more money then the brand paid.
Stores are all about making money so if a similar product that consumers want is cheaper cause China was able to spend less making them then the brand did then the store might decide to pick up that product so they can sell it at similar price to the brand name product or even cheaper and make more profit off it than they do for the branded item.
Most products come from the east. China doesn't honor trademarks or copyrights. They can produce similar items cheaper and sell them to stores cheaper who end up making more money.
|
19271fbe-96b1-4183-b562-ec9eaef38de5
|
btj1ke
|
why does birth control need to be taken at the same time every day? If you take it randomly what happens?
|
Dr here, it’s because drugs have an optimal live during the blood streams, lets say 8hours... if you take pills too early it is more easy for you to have side effects because the dose accumulates, in the other hand if you take pills too late the effect will be sub-therapeutic (not very effective).
Btw, NEVER take 2 pills at the same time (more pills= bad), if you forget a dose, just take the pill you forgot and wait for the next time
For more info just google therapeutic curves
Sorry for my English :)
|
6dc3b8dd-35cb-4d45-b28e-a10e1a02bdc7
|
btj5jk
|
what determines the type of batteries an electronic is assigned to? AAA, AA, the circle ones, etc
|
Two factors are in play:
1) The form factor of the device being powered.
2) The power requirements of the device.
AA, AAA, AAAA, C and D are all 1.5 volt regardless of their size. CR2032 (the circular button shaped battery) outputs 3V and 9V doesn’t need explanation.
If you have a remote control that requires 6V to power the electronics inside of it. You’ll need to use 4 A-D batteries (1.5V + 1.5V + 1.5V + 1.5V = 6V). D and C batteries are too big for remote controls, but A type batteries are just the right size. Whether the remote uses AA or AAA or AAAA depends on the shape of the remote, but it can be an arbitrary decision in many cases. If you are powering a flashlight, you might opt for C or D batteries since form-factor is less of an issue. Four D batteries in sequence will output 6V, just as four AA/AAA batteries do. However, because D batteries are bulkier they have more juice. This will makes them last longer inside a flashlight as opposed to 4 AAA batteries, which would also fit inside a flashlight and power it, but not for very long.
|
23a96388-ac68-47a3-b3ef-0ec4af6ea551
|
btj9wn
|
How does falling from a high distance, feet first, kill?
|
Basically imagine getting hit by a car's windshield that's going at 125mph (200km/h) and hits you feet first like that.
Essentially that's what would happen if you jumped off anything high enough to hit terminal velocity, except worse. The cars windshield would actually collapse and reduce the G-Forces, the ground won't.
|
ac420b49-4a64-4a01-a9ba-ea7fe7a65b8b
|
btjtjk
|
How does crying work?
|
Here's an article that probably answers your question: _URL_0_
|
1dd723f9-4394-42cf-ac40-ed8d3dcf45cd
|
btjuc9
|
Why does gum get stiff immediately when you drink water but not when you chew and add saliva?
|
The water you drink is almost always cooler than body temperature. The cold makes it hard, not the wet.
|
a37f0502-2e0e-4d13-8412-879b9fdd8412
|
btjuqc
|
Why does the US spend so much money on military?
|
I'm really not qualified to answer this question, but this is my take.
As a superpower with a lot of resources, the us is capable of a lot if influence. Some of that influence comes in the form of bases in remote areas of the world, which remain far longer than the original propose. They get entrenched in the local area, exercise influence with local leaders. There is a perceived diplomatic and strategic benefit in the deployment of personnel around the world.
Additionally, there are powerful defence contractors who strategically enjoy workers in Congressional districts so that their projects can't be discontinued without some congressional leaders losing votes (loss of jobs, etc). The prototypical example for this is the F22 raptor (not saying it's a bad program, just commenting about the arrangement with Northrop Grumman and Lockheed) This arrangement is known as the military industrial complex, and it has upward pressure on military spending.
|
ad314081-a43f-4b64-a10f-ab8ecea4eef1
|
btjzh7
|
Why do our noses get clogged and why is it so difficult to unclog them?
|
I’m not sure why they get clogged in general but I did read on ELI5 once that one nostril is always more clogged than the other because of the ‘contact time’ for smells. Some smells need to be in the nose longer to fully register and are slowed down by the mucus for that to happen!
Thought it was pretty interesting.
|
f27ccc93-18bc-4357-8c37-0f2e67447e87
|
btk5in
|
Why is it portrayed in movies that if you get bigger to smaller people you look like you're moving slowly
|
When we walk forward, we are actually falling over forwards, only to stop ourselves with a foot.
Gravity is the same value even at the larger scales, and so their limbs would fall at the same rate, but since they are so big there is much more distance for the limbs to travel before they hit the ground.
With regards to the booming voice, their vocal chords and mouths now have lower resonant frequencies. It's totally legit that they might speak louder and deeper.
|
d25570ba-4431-4324-850b-51a5fb9d7ce4
|
btk6al
|
How exactly do you "bombard" an atom in a nuclear reaction?
|
Uranium-235 when hit by a neutron it spit and you get 1 Barium atom, 1 Krypton atom and 3 neutrons. It is the released neutrons that will hit other Uranium atoms and you have a chain reaction.
& #x200B;
In a reactor you have control road of material that absorb neutrons that you can move to control the reaction. In most reactor they are also slowed down by hitting water or in the past graphite.
& #x200B;
There is natural release of neutrons from some radioactive elements like the daughter product that is produced in a reactor so when it has been in used so restart a not a problem. But the initial start might use som neutrons source that you put in there if I am not misstanke
& #x200B;
In a nuclear bomb they initially used small pellets as neutron generators. It have have a outer part of beryllium that will release neutron when hit by alpha particles. The inside have gold and nickle layer and finally Polonium in the center. The gold and nickle will block the alpha radiation from the highly radioactive polonium from hitting the Beryllium but when the pellets get crushed by the conventional exposives in the bomb the beryllium and polonium will mix and release neutrons that start the chain reaction in the bomb.
& #x200B;
In the nuclear weapons that exist today you have [Neutron\_generator](_URL_0_). They used electricity to accelerate deuterium of tritium atoms that hit a target of the same material and the result is nuclear fusion and you release neutrons. They are small linear particle accelerators that is also used for medical, pressurize and material analysis. So you have a electric device that sit a couple of centimeters away from conventional and is activated after the explosive detonate but before the shock wave hit the neutron generator and destroy it
|
a9ab780e-5114-4154-8bab-5ec404f6798f
|
btkdo1
|
Durag, is it just a fashion accessory or does it have function?
|
**Waves** are a hairstyle for curly hair in which the curls are brushed and/or combed and flattened out, creating a ripple-like pattern.
The hairstyle begins with a short-cropped haircut and frequent brushing and/or combing of the curls, which trains the curls to flatten out. Pomades and moisturizers can help hold the hair in place while preventing the hair from getting too dry. A durag is worn to preserve moisture while compressing the hair and holding it in place.
|
b6b8157a-5fc0-43da-bfe1-b588f83d6e4d
|
btkkyo
|
How do whips make a cracking sound
|
The tip, when you flip or crack it, breaks the sound barrier. So it’s all in how you crack the whip. There must be enough speed for it to break the sound barrier
|
cfa440f3-8b0c-48e5-8a57-1197cb5fb4f6
|
btl7mb
|
Why are people still buying Ivory?
|
Asia is the biggest consumers of ivory (China specifically if my memory serves me correctly) it’s been long believed that ivory holds some magical property that can cure any illness/disease. They actually ingest it believing it will cure their ailments. Some cultures argue that it’s part of their heritage and of course for some it’s simply a symbol of status.
|
5048f5a2-0bd3-49fe-8aca-df3e30b34d6c
|
btl8zz
|
how can people fall pregnant if they miss one contraceptive pill?
|
Yes. It's possible. The pill controls your hormone levels in the body, and missing one can cause your hormone levels to change just enough to trigger ovulation, or egg release.
|
707810f4-9613-4f75-813b-f16991b810a4
|
btlcg7
|
What physically causes the feeling in your stomach when you get nervous/anxious?
|
The vagus nerve! It connects the parasympathetic nervous system in the brain (which controls digestion) to your stomach.
The vagus nerve responds to fear and stress hormones and causes your stomach to react physically.
[Source](_URL_0_)
|
260b862c-4beb-4953-9aa8-b8459c9bea83
|
btlpao
|
If supermarkets have a defined science/art as to where products are located, why are they all different?
|
Numerous factors-
1 Store size. Different stores are different sizes, and shapes depending on the area they are situated and the availble space/ planned market.. What works for one floor plan doesn't neccesarily work for another.
2 customers. Customers in different areas like different things, so different branches carry different products, and or different stock levels. This means certain types of product need more space in some stores then others.
3 There's more then one possible arrangement that works well.
4 They do tend to have LOTS of things in common. Walk into any supermarket. Fresh Fruit and Veg is almost always the first thing you come to. Dairy products are always kept together. Dental and medical supplies are in the same isle, sweets biscuits and crisps are next to one another. And so on.
|
a424787a-fdc0-4106-bc87-5c1e6119ffaa
|
btlq8a
|
What exactly is dust?
|
Dust is made of fine particles of solid matter. On Earth, it generally consists of particles in the atmosphere that come from various sources such as soil, dust lifted by wind (an aeolian process), volcanic eruptions, and pollution. Dust in homes, offices, and other human environments contains small amounts of plant pollen, human and animal hairs, textile fibers, paper fibers, minerals from outdoor soil, human skin cells, burnt meteorite particles, and many other materials which may be found in the local environment
|
ac2431b7-4019-44d2-9de7-3aae4c7a579a
|
btlrex
|
Are cellphone electromagnetic radiation dangerous to human body or other animals?
|
TLDR: We are not 100% sure but there's no evidence whatsoever that it's dangerous even though it has been studied quite a lot.
The myths about the dangers of cell tower radiation date back as far as 2G days. In our everyday lives, we often associate "radiation" with something bad and scary like nuclear radiation.
In fact, there’s a major difference between safe radiation and the radiation in Chernonyl or X-ray machines. The dangerous, high frequency radiation is ionizing and can damage our DNA by knocking electrons out of the base molecules which can lead to tumors and cancer.
The radiation of mobile networks, however, has a much lower frequency and it's non-ionizing and can't damage our DNA. Certain types of non-ionizing radiation can still be bad for you as they produce heat at very high power levels. For example, a microwave oven is able to warm up your food very fast but it requires hundreds of watts of power to do so.
The [FCC’s](_URL_4_) safe limit for mobile phones is a specific absorption rate (SAR) of 1.6 W/kg, which is nowhere near enough to warm up your body. Smartphone manufacturers must demonstrate that their device complies with this limit before they can sell it in the U.S. In Europe, the [ICNIRP](_URL_5_) sets the limit to 2.0 W/kg. In practice, the vast majority of smartphones don't even get close to these limits.
Many studies have looked at if radio frequency electromagnetic radiation can affect healthy people. [A literature review in 2009](_URL_7_), and the [2010 Interphone study](_URL_0_) both summarized the lack of findings on this topic quite well.
[In 2011, the World Health Organization declared](_URL_0_) cellphones as a Class 2B carcinogen which may seem like evidence of it being dangerous but then again other Class 2B carcinogens include pickles, aloe vera leaf extract, and being a firefighter.
There have been no conclusive results indicating mobile technologies are eminently dangerous to humans and many clickbait articles rely on how difficult it is to contextualize scientific results to make wild claims that go unchecked for a long time. In particular, they often cite [one specific study](_URL_2_) as “proof” for their misinformation.
Many foundations like the American Cancer Society report this study without taking a strong stance, but the FDA, National Cancer Institute, and FCC all note that the overwhelming evidence points to the safety of cellphones and technologies like Bluetooth and Wi-Fi — even after considering the study’s results.
So, what about 5G technologies? Most of the 5G frequencies are already being used in other applications so there aren’t really any new risks. Higher frequency 5G technologies still don’t reach close to ionizing frequencies.
5G will mostly deploy in the 24 to 29GHz spectrum, which suffers from very high reflection rates. Therefore, energy absorption is confined to the surface layers of the skin rather than deeper tissue touched by lower frequencies.
The FCC and ICNIRP safety regulations still apply to 5G devices and according to research, a 60GHz 5G outputting a whopping 50W/m^(2) of power only raises skin temperature by 0.8 degrees, which is below the IEEE temperature threshold of 1 degree for radiation guidelines.
Scare stories are good for clickbait headlines but the reality is that small pieces of potential evidence are often quickly blown out of proportion. The most popularly cited research papers on the issue have major faults. Numerous longterm high-quality studies find no link between cellphones and cancer, including ones from the [Danish Strategic Research Council](_URL_3_), the [National Science Council in Taiwan](_URL_6_) , and [Japan’s Ministry of Internal Affairs and Communications](_URL_1_), amongst others.
Edit: Fixed typos
|
db4043b4-0c18-41ad-b8e4-023215fbd9b2
|
btlt9v
|
How does one develop a "taste" for a food or beverage that they initially disliked?
|
Positive association is a huge part. If you've ever noticed in life a lot of things you like or came to like are linked to fond memories. So even if it's something you disliked and you try it during a good time with friends, or even just having a really decent day your perception can begin to change the more it happens.
Also your tastebuds change as you age, especially from child too adult.
|
0bd7aed3-1629-4953-8df4-93cbeb091ebc
|
btlv6d
|
How does honey have an eternal shelf life?
|
The sugar content is so high that bacteria cannot survive in it, due to the osmotic pressure.
|
164264ea-999a-437a-89e7-e9e9b62dfe18
|
btlx8c
|
Why don’t saltwater fish absorb the salinity of the oceans and taste salty?
|
Water concentration inside a fish is higher than in the ocean itself because the ocean is so salty. As a result, most saltwater fish constantly lose water through their gills and skin. To get rid of excess salt, the fish's kidneys pump lots of salt into its urine.
tldr; they piss it out
|
bde8e9bd-228b-40dc-a37e-be7409961c7b
|
btm7xm
|
What is the difference between slow and fast twitch muscle fibers and how do you train each?
|
Slow twitch muscles are designed to handle long periods of steady-ish state activities, walking for example. They have a bunch of little power generators inside them called mitochondria which produce the energy needed to flex a muscle (ATP). These fuel contraction units (myofibrils) which is how you move. The key here is that they don't require a huge amount of energy because they are contracting somewhat slow, plus there's a large amount of energy production nearby, so you get muscles that can handle a lot of steady state movement.
Fast twitch handles the overload. Slow twitch muscles always contract first, and when they hit a wall strength wise, fast twitch activate to pick up the slack. They hit HARD and FAST and all at once (many of them will hit at once where a slow twitch muscle doesn't), so they can overcome whatever is happening. Good if you need to carry something up a flight of stairs, BUT there's a big trade off here - the energy/recovery efficiency of fast twitch muscles is atrocious compared to slow twitch (both head through glycolisis but slow twitch proceeds through the krebs cycle which can generate a huge amount of energy compared to glycolysis alone). They also have a lot more myofibrils but relatively few mitochondria, plus other structural things, which means they hit with a lot of fury and then they need some serious down time to recover the damage.
An additional point which will head into training - muscles aren't 100% committed to a type. There is carryover - a type 1 muscle fiber will behave like a type 2a with sufficient weight training for example. You aren't held strictly to a column, although genetically you are going to be dedicated to a general trend (try doing a standing vertical jump, in untrained individuals this is one of the more predictive measures of athletic performance).
Training is straight forward all muscle fibers will head in the direction you tell it to. Do a lot of cardio and all of your muscles will add in mitochondria, the slow twitch will just get even better at it. Do a bunch of weight training and everything will add myofibrils, with the fast twitch getting even stronger.
|
77a92e7a-d4e5-4a06-bbb0-03fc7414ce75
|
btm8av
|
What is the sensation that we experience when we sleep that feels like falling and causes us to wake up suddenly?
|
It’s called a hypnic jerk and it’s a muscle spasm that we can’t control. Think of it like sleep hiccups. Some people think it’s caused when your brain is trying to take over at the same time youre about to go to sleep. Other people feel like it’s evolutionary. Our monkey minds are telling us we’re falling from a tree
|
a447adb4-d7a4-4929-9503-72eb6148605b
|
btmbdq
|
Georgia has created massive tax incentives for the movie industry, making them the largest site for feature filming in 2016. Why was this policy created, and why haven’t more states followed in their footsteps?
|
Lots of other states offer tax incentives for filming, Georgia just has the most generous. The problem is that the film industry is very mobile.
If you give tax incentives to a factory or corporate headquarters, the incentives expire after a few years and the company has bought a building and has a lot of local employees. They could potentially get more incentives by moving to another state, but there would be a lot of costs and inconvenience associated with that. So most companies aren't going to relocate every 5 years.
Movies on the other hand are project-driven. The production company chooses a location for each movie and a lot of the workers are contractors, so if they move to a new location they just hire different contractors. So if Georgia ever reduces their incentives or other states start offering more generous ones, most of the industry will pack up and move.
|
02015050-a301-4cf3-ac93-7d988c68bd2a
|
btmbrt
|
Why is that some some bugs lay on their back when they die?
|
Bug legs are similar to how hydraulics work, moving fluid around inside to make them extend and contract. When the bug dies, there’s no pressure extending the legs outwards so they all curl in.
|
bec444cf-0ed2-4c74-9c27-137176a7086b
|
btmhaw
|
why can't nuclear waste be neutralized?
|
Its not like acidic or caustic liquid that can be "neutralized". Nuclear waste has products that are radioactive by nature and the only way to fix that is to allow them to decay until they are stable. Which usually involves several steps and each one releases some form of radiation. The only way to bypass this would be to somehow manipulate the nuclei of the atoms and change the atoms into something else. We've only come as far as splitting atoms for bombs and destructive means. The "strong force" that holds a nucleas together is fundamentally unknown, so we are unable to manipulate an element at this level and cannot stabilize the waste by any means besides allowing it to naturally decay.
|
498fe6df-d13f-4846-993b-1c02555b4126
|
btmxrl
|
Why do space rocks/debris always revolve around the equator? (At least most of the time)
|
There is nothing preventing stuff from orbiting in any plane. But *most of the time* it orbits on the equatorial plane because it probably started out that way, or they end that way because **Angular momentum is always conserved.**
A systems angular moment can be resolved in one single direction. This mean that you can start will billions of particles moving in random direction, but the angular momentum will always be in the same direction. So over time, the angular momentum of individual particles of the system, not in the plane, get cancelled off.
This is not the best explanation, but here a [short video](_URL_0_) that explains this phenomenon
|
0fb98397-38b7-46b4-b4e9-e09978a7b66e
|
btn2uj
|
Why do nearby noises sometimes sound louder when you cup your ears?
|
Sound waves bounce off hard surfaces. By cupping your ears you’re creating extra angles of sound reaching the ear drum.
|
57890e2c-d08d-47c0-a4b5-2a65434a81c1
|
btn8sz
|
How does a transformer work?
|
When you move a wire though an electromagnetic field you can induce a current in the wire... The same works the other way where if you "move" the electric or magnetic field relative to the wire it can induce a current in the wire. As well, a current going through a wire will create its own electric and magnetic fields.
Using alternating current (where the direction of the current will flip proportional to its frequency... So if its 60hz then it will change direction 120 times per second) you can create a changing electromagnetic field, if you have 2 wires close together you can induce an alternating current in the other wire. To better induce such a current you add coils.
Edit: wrote this really early in the morning local time
|
1669986d-45d3-4266-a708-0bae298dbb7c
|
btn8t9
|
How is it possible for a food to have 0 calories?
|
It could be a couple of things. It could be it is composed entirely of water and minerals that your body can't digest or absorb, thus no energy is gained from it. Or it could have a little energy but a serving size falls below the amount for a food calorie (which is 1000 calories as is used in physics).
|
92cffe05-4402-469a-ac3c-b573b68a638d
|
btna08
|
How does 5G wireless technology work?
|
You can find a complete outline of the most up to date 5G standards published by [3GPP](_URL_0_). DR 21.915 provides a summary of each Release, The current standard, 1.1.0 can be found in release 15:
The 5G requirements have been defined in terms of new services and markets by SA1, under the "SMARTER" work item. These are defined mostly in TS 22.261 [1], which describes different types of requirements for different 5G usage:
- Enhanced Mobile Broadband (eMBB): the requirements are defined on high data rates, higher traffic or connection density, high user mobility, and the requirements related to various deployment and coverage scenarios. The scenarios address different service areas (e.g., indoor/outdoor , urban and rural areas, office and home, local and wide areas connectivity), and special deployments (e.g., massive gatherings, broadcast, residential, and high-speed vehicles). The scenarios and their performance requirements can be found in table 7.1-1 of TS 22.261 [1]. For instance, for the downlink, experienced data rate of up to 50 Mbps are expected outdoor and 1 Gbps indoor (5GLAN), and half of these values for the uplink. For services to an airplane, a bitrate of 1,2 Gbps is expected per plane.
- Critical Communications (CC) and Ultra Reliable and Low Latency Communications (URLLC): Several scenarios require the support of very low latency and very high communications service availability. These are driven by the new services such as industrial automation. The overall service latency depends on the delay on the radio interface, transmission within the 5G system, transmission to a server which may be outside the 5G system, and data processing. Some of these factors depend directly on the 5G system itself, whereas for others the impact can be reduced by suitable interconnections between the 5G system and services or servers outside of the 5G system, for example, to allow local hosting of the services. The scenarios and their performance requirements can be found in table 7.2.2-1 of TS 22.261 [1]. For instance, in the context of remote control for process automation, a reliability of 99,9999% is expected, with a user experienced data rate up to 100 Mbps and an end-to-end latency of 50 ms. This is provided in particular through the Edge Computing capability described below.
- Massive Internet of Things (mIoT). Several scenarios require the 5G system to support very high traffic densities of devices. The Massive Internet of Things requirements include the operational aspects that apply to the wide range of IoT devices and services anticipated in the 5G timeframe.
- Flexible network operations. These are a set of specificities offered by the 5G system, as detailed in the following sections. It covers aspects such as network slicing, network capability exposure, scalability, and diverse mobility, security, efficient content delivery, and migration and interworking.
|
8666000b-46e8-422e-85a6-2145b9af4587
|
btnjup
|
in parking lots, is there a reason why tend to park directly next to someone else, even when there's large amounts of open spaces?
|
I cannot speak to the larger trend, but for me personally there are a few reasons I park next to a filled space when there is an opportunity to park with empty on both sides:
1) there was a reason why that other person parked there (close to cart return, shade, close to other destination of interest, no puddles...) and that reason applies to the spot beside it as well.
2) lot NEARLY full and odd sized vehicles. If I park with one empty space between us, and have reason to believe that the empty space will later be filled, then I am forcing someone else to squeeze between our vehicles. And I don’t trust other drivers more than I am forced to. Leaving two empty spots around me means two people have the chance to be bad at parking and mess up my vehicle. Leaving one side already in use means that, if I leave before that other person, only one side of my vehicle risks other people being bad at parking.
3) alignment. If I cannot see the lines for the parking lot, or my vehicle is hard to maneuver, parking beside someone else let’s me park an appropriate distance from them, and match my depth to theirs. That gives me a good chance of being properly in my own space.
|
c0472596-c8c2-402a-a4b1-ff8fa5ab4065
|
btnlty
|
Are the emissions of the hydrogen vehicles neutral to the environment?
|
The amount of water vapor they produce is trivial compared to natural evaporation. It's basically neutral, yes.
|
bb3e8a62-b52f-40f9-ab0c-8daae3528a26
|
btnwcp
|
How does cutting steak against the grain affect the texture?
|
Long grain makes the meat chewy.
Cutting it with the grain will leave long grains, but against it will make them smaller.
|
ab848789-32c1-4335-9b74-0ad41253f499
|
btnyqd
|
What do POP and IMAP emails mean? What's the difference?
|
IMAP is short for "Internet Message Access Protocol", while POP translates to "Post Office Protocol". In other words, both are email protocols. They allow you to read emails locally using a third party application. Examples of such applications are Outlook, Thunderbird, Eudora, GNUMail, or (Mac) Mail. [1]
POP downloads a copy of your emails from your account to the 3rd party app. This means that if you delete an email from your account after it's been downloaded, the downloaded copy remains in the 3rd party app. Additionally, POP only downloads emails from the Inbox (not personalized folders), so to download all of your emails, you'd need to move email from existing folders to the Inbox.
IMAP, however, continually syncs the app and your account to keep the information in both places identical. This means that anything you do with messages or folders in the actual email account will also occur in the 3rd party app (and vice versa). [2]
1 [IMAP vs. POP3: What Is It and Which One Should You Use?](_URL_1_)
2 [Use POP or IMAP to sync AOL Mail on a third-party app or download your email](_URL_0_)
|
5b03a440-060b-4544-8df5-d2137c58b1dc
|
bto1jn
|
How are newly discovered planets named?
|
The International Astronomical Union's Minor Planet Center assigns a temporary name after a discovery, while they check to see if it is actually a new discovery or if it's already been found. Once they determine it's new, it's assigned a permanent number like an ISBN for textbooks. Then there are committees that decide what the actual name will be.
|
866c4bc8-c546-4751-8ff6-83ba02aed7eb
|
bto39d
|
How does making the '8' sign in Google Maps improves the compass accuracy?
|
The compass in the phone does not work the same way as the old whiskey compass. Both are trying to locate the direction of the magnetic field but where a whiskey compass will have a needle that spins around until it points in the right way the phone compass is stuck in place and can only measure the magnetic field in two directions. The problem is that there may be different factors that changes the readings of the magnetic field. So in order to really be able to find out what direction you are pointing it needs to compare the current reading with the readings in all directions. When you spin the phone around it can take readings from multiple directions. So that if there was an offset in one sensor making it read a stronger magnetic field then there really is it can see that it is not affected by where you point the device and can therefore ignore that offset.
|
6ed3e198-c128-4f4c-8481-82ebf1a30789
|
btoinu
|
How does rain make sand dunes fall down when just a bit of water makes sand harder?
|
The sand on the outside of the dune gets heavy with water, then the dry crumbly sand in the middle can't support the weight so it falls down
|
831ccfaf-f755-4065-9f9b-4b5d0c4e7da3
|
btoph4
|
Why is it easy to cross eyes inward (towards nose) but not outward?
|
Because when you cross your eyes inward you can focus both of them on your nose. Which is what they're designed to do. You can't focus your eyes on two separate objects at once, as you would need tot to cross them outwards
|
5d86fd56-10f3-49cf-8aef-5da6def66bbb
|
btozln
|
Why don’t the rest of the world recycle like in Sweden?
|
Link is broken, but, regardless of the details of Sweden's program: recycling is expensive. It is usually cheaper to just produce new materials. Recycling has a carbon output as well. When you add up all the inputs and outputs, recycling comes out ahead in only one area: landfills - it reduces the need for landfill space.
If a country has plenty of space for landfills, it's hard to justify an extensive recycling program.
|
7d470080-6b15-48de-9e9e-920b58734988
|
btozp8
|
What does it mean to refinance your home?
|
just in case you don't know it's needed to explain what a mortgage is, which is a loan in exchange for taking the title of the debtor's property, with the condition that the conveyance of title becomes void upon the payment of the debt.
when you refinance what you're doing is taking another mortgage to pay the old one, in the proses changing the old mortgage for the new one, the reason for doing this is that the new one may have lower interest rates that the old one therefore making it cheaper for you in the long term.
keep in mind that this doesn't come without drawbacks, most notorious the fact the mortgage always comes with a closing cost, that is an extra money that you have to pay for closing the mortgage earlier than agreed. so refinancing may be convenient or not, sometimes, depending on the closing cost and the different interest rates
|
9cef3d0c-71cb-40f1-ac2c-0938fe321b02
|
btp3gw
|
Why is it impossible to change from first gear to reverse while driving, but not the other way around?
|
For starters, you shouldn't change from a forward gear to a reverse gear while moving or vice versa. This should be obvious because it causes immense stress to the the entire driveline. You should only change to a gear in the opposite direction when you are stopped.
Now, with that said, I suppose the logic that could be applied to changing from reverse to first while moving is that you're very slowly while in reverse so the stress on the drivetrain isn't AS incredible as it would be if you were reversing at like 30 mph. First gear is usually used to accelerate to a higher speed, so changing direction abruptly while moving fast is going to destroy very expensive things.
If you want to mention the J-turn, this is possible because the vehicle moves in reverse and turns, at which point the driver either shifts to neutral or disengages the clutch. With the engine and transmission no longer connected, everything is safe. The driver then waits for the vehicle to swing around and start rolling in what is now the forward direction using only the momentum the vehicle had when the driveline was disengaged, which is safe as far as the drivetrain is concerned. Once the vehicle is clearly moving forward, then it's safe to engage a forward gear and proceed.
|
bd6c1021-31a1-47d5-8113-136803c585cd
|
btpjik
|
How on earth did Steemit, Medium, and similar platforms attract early writers?
|
For Medium, the creator of it Ev Williams (who was a major player in startups/silicon valley, and former CEO of Twitter) used his enormous connections to get early adopters on the platform, which at the time, was invite-only to publish (but viewable by anyone). It succeeded, but don't read too much into it, as likely a dozen other companies doing the exact same thing, emerged and failed before, during, and after, and sometimes why one of these tech platforms succeeds and others fail, even with big names behind it, can be somewhat random.
|
f8df3ae1-e4df-4ec7-a7fb-9118e7ad4e92
|
btplas
|
What is the difference between a Geiger Counters and Dosimeters. Where would you and not use them.
|
A Geiger counter measures the amount of ion pairs created every 60 seconds, so you can see how much radiation exists (although, a Geiger counter won't tell you *what* radiation is created, which you may want to know).
A dosimeter simply tallies all the radiation it's been exposed to. So if the Geiger counter is your speedometer, the dosimeter is your odometer. One tells you how fast you're currently going, the other tells you how far you've gone.
|
1dd20cf0-ae25-44b0-94df-811c1114d8b6
|
btq19d
|
what causes the pain in a headache?
|
OP we **do not know** the answer to this and I regret to inform you some will speak as if they do. There are *many* causes of headache, some more obvious than the other.
For instance, some have told you already how it has something to do with the nerves. You do not have sensation in your brain. Local anesthetic is not needed for brain surgeries (ie lobotomies).
You can sense pressure inside the head (which is actually distinct from pain), but that is the extent of what we know. Sometimes there are fragments of the skull in serious emergency that break off & cause pain locally, other times there’s well established types of cancers that cause headaches in certain regions, or splitting headaches.
For a headache originating from, say, the common cold, we don’t know where they come from or how. There are some theories, but they’re VERY unscientific and some are unfalsifiable (ie making correlation observations) and could be interpreted many ways.
TL;DR: We don’t know.
|
fb4ff4d3-b58b-4cbf-bde4-a0b419eb2113
|
btq1f7
|
- Infinity?
|
What's the highest number you can think of? Now add 1 to it. You will never get a number you can't add 1 to and make a larger number. Therefore, there are infinite numbers, there is no largest number.
|
507c4c59-7527-49fb-80c4-17846961e5d4
|
btqap7
|
How can a phone battery lose it's charge from a physical bump?
|
i suspect your battery or the power management circuitry was not properly adhered to the device and therefore was damaged from the fall
lithium polymer batteries are literally just layers of foil that are wrapped in more foil, they are every easily damaged by impacts as there is no structural components protecting them
|
f19bac3c-2504-4efb-8650-17a7f7077ded
|
btqc14
|
Why can’t people walk after certain injuries (not obvious paralyzing injuries)? Do you just forget how to walk and have to remember?
|
Sometimes the injury is to the leg, hip, or back and it prevents walking for a time.
Sometimes it is to the head, ears, or toes and changes balance and so that has to be relearned or recovered from.
With the elderly you also see a lot of people barely being strong enough to walk getting an ailment that puts them bed ridden for a few weeks or months and that is enough time for their muscles to atrophy enough that they slip below the line of being capable of walking any more.
|
d4e0bbbd-3249-4b82-92b0-b9af37ea4df0
|
btqt5r
|
How can a solid material be transparent?
|
Different molecules will absorb different wavelengths of light, based on the possible energy of the electrons in the molecules. If the light isn't absorbed, it goes through (is transmitted).
Glass is transparent because there are no possible energy level for its electrons that match visible light. There are some levels for other types of light (like ultravoilet) so those types get blocked.
|
44af5c86-17c7-42d7-b6f3-c2a9981cb001
|
btqtlh
|
If the sun is in space, why is there light on earth, but not in space?
|
because what humans perceive as light, is just light reflecting off objects
in space there is nothing for the light to reflect off of, therefore space looks eternally dark
|
acd7db61-a9af-4c47-b9b8-8ae637d289b8
|
btrd9w
|
How does the Herrman grid illusion work?
|
Nobody knows for sure.
One theory is [lateral inhibition](_URL_1_) where some receptors in the eye may suppress other receptors, creating a perceived area of darkness. This has been roundly challenged however.
Another theory is the presence of S1 simple cells, that are part of how we in perceive 3D images out of what are essentially 2D patterns. In this case, the flat grid may 'trick' them into perceiving an illusory image. But there are problems there as well.
Anyway, I dug this all out of the Wikipedia page for [Grid Illusion](_URL_0_).
|
8a63105e-3496-436a-a1e6-27d864ab8d58
|
btrl2i
|
Why do both eyes blink at the same time?
|
When you use two eyes, your brain is stitching together information from two sources, pretty flawlessly, to give you a sense of depth perception. There is a lot of overlap in what each eye sees, and your brain needs to sort out how it all makes sense.
Blinking with one eye at a time (winking), would mean disrupting that balance, and your brain would need to adjust. In addition, you'd actually be spending longer with imperfect vision. Say, one eye closed for 2 seconds a minute compared to two eyes closed for one second. I'm guessing this trade-off wasn't worth it biologically.
|
d9d50287-edc4-45ec-ba7f-08050ef1c5d4
|
btrqbj
|
How does an “Acquired taste” work?
|
The brain is very adaptive. Certain tastes the brain interprets that they should be avoided because they are new and potentially hazardous to the body. However the brain is predisposed to want to be "happy". So if you regularly expose yourself to these types of tastes and learn nothing bad is happening then the brain will turn those "warning" feelings into "happy" feelings as that is the preferred feeling.
|
ae68f461-333f-4cfe-9c07-c327f7604b1b
|
btrs6n
|
How did large congregations of people hear speeches (i.e. Lincoln's address, and countless other older speeches) without the use of microphones?
|
If people are quiet, and there is no traffic or other sources of noise nearby, the voice of a single shouting man can be clearly heard for quite a long way away. In addition the large congregations were usually held at big amphitheaters which are specifically designed to help the sound from the stage carry outwards. The stages usually had reflectors and resonators at strategic places to make this happen. Where there were problems hearing the people speaking they would use megaphones. These are large cones that a speaker could shout into in order for his voice to become louder and more directed so that more people could hear them. Popular speeches would also be written down or memorized so they could be retold. A lot of the people attending political congregations would be campaigners who would go back to their home towns and recite the speech word for word so that even more would be able to hear it.
|
5bc87ff1-ad89-4b09-ad34-cf1db62ea293
|
btryxw
|
Where does the idea/synonym of being "hot" as being beautiful/handsome come from?
|
it comes from feeling flushed, when blood rises to the surface. your face and maybe neck will turn red, you will feel warm, maybe a little lightheaded.
|
e1080216-a525-4026-9d27-fbd598bea599
|
bts4a5
|
How does a simple, cheap sensor light know how long to stay on?
|
A design like that today likely use a simple micro controller that is a very simple computer in a single chip. The can be as cheap as 3 cents each for as small orders as 100 controlled for example [here](_URL_1_). They can only be programmed once so you cant change what they do.
It could be som dedicated timer chip that is used where it is the values of other components on the board that determine the time it is on like a classic 555 timer that you can get for 6c [here](_URL_0_) Then you could change it by replacing resistors and capacitors or even just bypass it to only light up when motion is detected.
IT is in theory possible that some more advance microelectronic is used that can be programmable.
It can even be a dedicated chip that is just for that purpose that cant be changes.
& #x200B;
So the answer is it depends but I would be surprised if it could be done without replace some components on the board. So you would need to know hot to solder surface mounted components. I would say that if you need to answer the question here how it can be done you do not have enough knowledge to do iy yourself without learning about electronics. But then you likely could changed or just replaced some part and add your own control logic after you purchased the equipment.
But if you would like the change the functionality time simplest and cheapest way is to look for a motion actives light that you can timing setting for and by that
|
3f5c5e88-1942-4b79-a63e-fc687700b5f5
|
bts7r5
|
With flashing lights, why does the first flash that you see just as you look at it seem to last longer than all the rest?
|
This is *chronostasis,* as your brain tries to guess what was going on while your eyes were moving.
Great minds think alike. Ahoy, matey! Yer not alone in askin', and kind strangers have explained:
1. [ELI5: Why does the second hand on a clock seem to pause when I first glance at it for longer than one second? ](_URL_2_) ^(_5 comments_)
1. [ELI5: Why is it that whenever I look at a clock, the first second seems to linger for longer than a second? ](_URL_3_) ^(_6 comments_)
1. [ELI5: Why does it appear that the second hand on a clock stands still longer when you just start looking at it? ](_URL_1_) ^(_3 comments_)
1. [ELI5:When you look at the second hand on a clock, why does the first second seem to hang longer than subsequent seconds? ](_URL_5_) ^(_3 comments_)
1. [Why is it that when you look at a clock the first second appears to take forever to tick, but after that it proceeds normally? ](_URL_0_) ^(_ > 100 comments_)
1. [ELI5: What is the phenomenon that occurs when you look at the second hand on a clock just as it was about to change to a new second and it seems to take longer than usual and the next 2 seconds are faster than normal? How does our brain know how to do that? ](_URL_6_) ^(_3 comments_)
1. [ELI5: When glancing at a clock, why does the first second after glancing at it sometimes feel longer than the rest? ](_URL_4_) ^(_ > 100 comments_)
|
3dde70dd-bb65-4f34-997a-ea311d4a9239
|
bts9m6
|
They say cigarettes contain stuff like benzene, acetone, and chloroform which are all volatile solvents. How can they exist in a cigarette if they evaporate at room temperature?
|
They’re created as a byproduct of burning the cigarette, not “in it” as individual molecules to begin with. It’s the same reason that burning hydrogen produces water as a byproduct (because the hydrogen reacts with the oxygen in the air and produces H2O).
|
9bdc6cf0-e378-4d5e-beee-5636842cb9a7
|
btsaad
|
How is sweating good for your health?
|
It keeps you from overheating and flushes out your sweat glands, keeping them from clogging and getting infected.
|
fca0f086-a015-4896-a22f-576d2b4dfaab
|
btsbui
|
Why is today Tuesday? By that I mean why isn't the week shifted over x days? What decided when the first week ever started?
|
Our current calendar, the Gregorian calendar, was based off a previous, very similair calendar, the Julian Calendar, which was in use since the early Roman Empire.
The current calendar started in the late 1500s, but adoption in different areas varied over the next about 400 years, but was in widespread use in Europe during the 1700s.
so who decided it: Basically someone in the 1580s just F-ing decided it, and everyone went with it.
|
64aab9fb-4293-4295-8da0-b1e77b86621c
|
btsotu
|
Whats the purpose of a table read?
|
* It's the first time the cast and crew have assembled, so it can serve as a general meeting to discuss what the film/episode/play is going to be about and the goal of the production overall
* It allows everyone involved to see what the project is going to be and what their role in it is
* It allows the actors a chance to see how their role will fit into the project and how they interact with the rest of the cast
* It allows the producers a chance to see how the actors fit into the project, whether they've cast it correctly, etc.
* It allows the writers a chance to see their work performed for the first time, which lets them see it from a different angle and identify trouble spots they might have missed
|
2ba4c4c1-9b0f-4a3f-82c0-a2aadc264b32
|
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