Recent comments in /f/explainlikeimfive

Scuka1 t1_j2e3ktu wrote

>I don't think thats endless though

It is endless in theory, if you're high enough.

ISS has to boost because, even though it's technically outside the atmosphere, there are still some air particles floating around up there, producing a tiny amount of drag which needs to be compensated every so often.

For a body to stay in orbit, it needs to have a certain speed. Drag is slowly taking that speed away. Boosting is adding that speed back.

2

phiwong t1_j2e3cbg wrote

At a fundamental level (ignoring macroeconomics for the moment), money is a measure of value. Money is used as an intermediary to exchange of real goods and services.

Start with the idea that there is a deserted island with 2 people, A and B. A grows coconuts and grows 10 per year. B grows mangoes and grows 20 a year. Without any money, they decide to split their "production" through trade. B gives 10 mangoes to A in exchange for 5 coconuts.

Now they decide that they will "print" 30 dollars. Initially split between them equally ie 15 dollars each. Since this 15 dollars each is used to trade for their equal share of the goods, 5 coconuts trade for 15 dollars ($3 per coconut) and 10 mangoes trade for 15 dollars ($1.50 per coconut). At the end of the year after all that trading A and B both still have 15 dollars each and would have traded their goods through money. This is a stable situation that can simply repeat year after year.

Now say they decide that instead of 30 dollars, they want 300 dollars in their economy - so they print 270 dollars more and each now have 150 dollars each. Are they now "richer"? Do either of them get more mangoes or coconuts?

If you understand this example, then it is a start to understanding why printing money does nothing (at an ELI5 level) to make people "richer". People consume goods and services - money is just a means of exchange. More money without more goods and services is essentially meaningless.

1

Scuka1 t1_j2e37sv wrote

Yes. Orbit is basically a fall that "misses" the Earth (or whatever body you're orbiting around).

Newton's Cannon is a great explanation of that.

https://i.stack.imgur.com/STNEW.jpg

If you launch an object, it will fall in a curved path. If you launch if faster, it will fall in a curved path, but with a larger radius. If you launch it REALLY fast, the radius of that curve will be such that it will go around the Earth.

That's how rockets reach orbit. They basically accelerate sideways a lot.

2

MisterProfGuy t1_j2e2ysd wrote

It's a lot tougher to say than you want, and there's not a hard and fast medical explanation that's conclusive for migraines. Headache is a catch all term for head pain. Sources are anything from impact, to blood pressure, to muscle fatigue in the neck and dehydration.

Migraines appear to be a problem with blood vessels. It's considered a "neurovascular" problem and affects more than just the head. They can be caused by pretty much the same thing as headaches. They are treated by treating one of the suspected causes. Some people respond well to antidepressants, some people respond well to medicines that affect blood vessels.

Thunderclap headaches are really uncommon, really severe headaches that typically warn about severe problems in the brain, like bleeding or an aneurysm.

2

__Pure_Vessel__ t1_j2e2wrz wrote

No, of course not. Authorities won't allow me 😂,

and again, no, that wasn't because of the movies, i had this in my mind whenever i came back home with subways.

But thank you for your time and the explanation.

1

Flair_Helper t1_j2e2tny wrote

Please read this entire message

Your submission has been removed for the following reason(s):

Loaded questions, or ones based on a false premise, are not allowed on ELI5. A loaded question is one that posits a specific view of reality and asks for explanations that confirm it. These usually include the poster's own opinion and bias, but do not always - there is overlap between this and parts of Rule 2. Note that this specifically includes false premises.

If you would like this removal reviewed, please read the detailed rules first. If you believe this submission was removed erroneously, please use this form and we will review your submission.

1

atfyfe t1_j2e2j6t wrote

Not everything has a location. Where is time? Where is the possibility that WW2 didn't happen? Where is red? (if I destroy all the red things in the universe, have I destroyed red itself or just all the red things?) Where is the number '2' or multiplication? Where is the fact that masses attract or the fact that the rule that nothing can go faster than the speed of light or any of the physical laws? They govern physical objects, but they are physical themselves. I can't kick gravity.

Everything does seem to depend on the physical, but it doesn't appear to be true that everything is physical. In philosophy we say all these things at least appear to 'supervene' on the physical.

There are some philosophers who argue that everything is physical (eliminative physicalism), but that view has been losing support in favor of the view that everything depends upon the physical (non-reductive physicalism).

So the mind exists, but it isn't the sort of thing that has a location - just like numbers, physical laws, possibilities, time, etc. It's a part of the world, but not a physical part even if it's existence seems to depend on the physical (i.e your mind stops existing once your brain does and depends on your brain).

See: https://iep.utm.edu/supermin/

Typed on my phone, pls excuse typos.

3

Ansuz07 t1_j2e2ggx wrote

One of the primary jobs of the intestines is to absorb water from the digested food processed by the stomach. The water is extracted and put back into the bloodstream (along with other nutrients) where it is processed by other organs. The kidneys then filter the blood for waste products and use some of the water to expel that waste.

3

tiredstars t1_j2e2c9s wrote

To spell this out a bit more, imagine you and I are the only producing, buying and selling things in the economy.

I grow five turnips for sale, you grow five carrots for sale. The government has printed £10 and we each have half of it. I want five carrots and I give you £5 for them. You want five turnips and give me £5 for them.

Now imagine the government gives each of us another £5 so we have £10 each.

What often happens is that an increased supply of money decreases its value. So now what happens is that I charge you £2 per carrot and you charge me £2 per turnip.

That's inflation. Now inflation has good and bad points - or rather it tends to benefit some and harms others. A careful increase in the money supply to help pay off debts can be a good thing for a country. The benefits can outweigh the costs. It doesn't automatically lead to runaway inflation.

There are also cases where inflation doesn't happen. Let's say I've got an unused field and I could grow more carrots, but you don't have the money to buy them. In this case the government creating more money can help the economy.

Knowing when this is and isn't the case is one of the big challenges for economists, central banks and governments. The US in the years right after the financial crisis is a good example: money creation stimulating economic growth and not driving inflation. Those conditions have probably changed now, though, and most developed countries are trying to restrict the money supply.

3

PckMan t1_j2e285d wrote

Tetanus is caused by bacteria. It's a common misconception that this bacteria is inherently found on rusted metal but that's not true, it's found in soil. We've been taught that getting injured on a rusted piece of metal can cause tetanus because for starters, it's more likely to find rusted metal outside than inside, and secondly, it's more likely that rusted metal will injure you than non rusted metal since generally speaking people don't just leave out sharp or dangerous pieces of metal around, but rusted metal can still cut someone because of how the metal turns from smooth to jagged.

If you get cut on rusted metal at a playground for example it could very well contain tetanus, or a fence, or a sign post, or something like that, because it's outside and driven into soil. Rusted metal that's not come in contact with any possible sources of tetanus bacetria can't just have them because it's rusted.

1

Smashville66 t1_j2e223t wrote

I worked for the US government my entire career, and this always drove me batshit. My budget was a “mandatory spend”, whether useful or not. We’d buy promotional giveaways just to spend the money. Think about that…a federal agency buying can cozies because if we didn’t spend the money allocated to us, we’d get a smaller budget the following year. It just seems to encourage fraud, waste, and abuse.

42

callahan_dsome t1_j2e1ubf wrote

An alternative to the current answers;

If you are not moving when you jump down onto the moving train, it will be passing under you at whatever speed it is going. You are at a standstill, and the train is not.

But when you jump while on a train, you are already moving at the same speed as the train. If the train stopped immediately, but you weren’t strapped in, your body would continue to travel at that speed.

Now if you jumped straight up from the roof of the subway (assuming height clearance) you might assume you should land on the same spot since you are traveling the same speed as the train. But the air resistance might mean you land a little farther behind where you jumped since the train is still moving, but you are suspended in the air (creating drag for you to slow down slightly more than the train).

Another common example used to explain this is people playing catch on a long moving bus. When the ball is thrown forward (the direction the bus is moving) the ball will be going faster than the train, but to the people throwing it, it doesn’t seem like it’s going as fast because they are moving with it. But someone not on the bus standing still would see the ball moving much faster.

2