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The fax machine predates the (first) American Civil War.
There are more trees on earth by far than there are stars in the galaxy.
Butterflies can remember things from their time as a caterpillar.
These memories are retained after going through metamorphosis, the breakdown of their caterpillar form into a cellular soup (or partial soup).
Details here
- Catalan children get (some) of their Christmas presents by beating a cute piece of wood that then shits the presents out onto the floor. Seriously.
- There was a British guy who fought in WW2 with a scottish broadsword and bagpipes. However, the best thing is that he wasn’t even a Scotsman.
- On a small enough timescale, the electric field actually bounces around in your wires for a while after you flick a switch, even if it’s DC, just to “figure out” where it “needs to go”.
- More than twice as much time had passed from the invention of the motorcycle until the first motorcycle backflip, then had from the invention of the airplane until the first humans landing on the moon.
The electric field one is also interesting, because the cable length doesn’t actually determine how long it takes to turn on. All that matters is the distance between the power source and the device. Electricity travels at the speed of light, which means we can measure how long it should take to travel down the wire.
But let’s say you have a 1 light year long power cable, made out of a perfect conductor (so we don’t need to worry about power loss from things like wire resistance or heat). Then you set the power source right next to the device and turn it on. The logical person may say that the device would take a full year to turn on, because the cable is one light year long. Others may say that it will take two light years to turn on; Long enough for the electricity to make a full circuit down the cable and back to the power source again.
But instead, the device turns on (nearly) instantly. Because the wire isn’t actually what causes the device to turn on. The device turns on because of an EM field between itself and the power source. The wire is simply facilitating the creation of that field. The only thing that matters is the distance between the source of power and the device. That distance, divided by the speed of light, is how long the device will take to turn on. If the device was a full light year away from the power source, it would take a full year to turn on. But since the device is sitting right next to the power source, it turns on right away.
Can you help me understand why the distance between the power source and the load impacts how long it would take to turn on? I remember a video a while back (veritasium maybe?) that explained it like metaphorically pushing/pulling a chain inside the wire, but why would distance to the source impact this?
Printer ink costs more per milliliter than human blood.
California has the same population as Australia.
Doesn’t it have a much bigger population than Aus? Wikipedia says that California has about 39 million people and Australia only 27 million.
They may have mixed up the British commonwealth. Canada has a similar population to California
Australia feels like a small country stretched around the perimeter of a genuinely impressive quantity of absolutely nothing.
Like a donut with a very spicy hole
The great sand croissant.
Rojava exists.
Consider a dam that is 10m tall
Then consider the height of water behind that dam is 5m tall.
Does the dam need to be built stronger if the water behind it is 1 km long?
How about only 500m?
How about 1m?
The answer is, it doesn’t matter. Water exerts pressure equally regardless of how much water is behind it.
Therefore a graduated cylinder that is 10m tall needs to resist the same amount of force as a dam 10m tall regardless of how much water is behind the dam. Even a thin sliver of water 1mm thick and 5m tall has the same force as a 5m lake behind the dam.
Incompressible fluids are pretty insane
This is also why trees are so fucking crazy to think about. It is impossible to pump water up a hose more than ~32 feet. Like it’s literally physically impossible to stick a pump at the top of a tall building and suck water straight up a pipe. You need a complicated series of pumps and one-way valves to pump it up in stages. Because you’re not really “sucking” the water up the pipe. You’re just lowering the pressure in the pipe, and atmospheric pressure pushes the water upwards to fill the low pressure. After 32 feet tall, the top of the hose/pipe will be a perfect vacuum, atmospheric pressure won’t be able to push liquid water upwards any farther, and the water will just begin cold-boiling in the top of the pipe as the liquid water turns into gas (steam) to fill the vacuum.
But tall trees can move water all the way to their leaves by using only passive capillary action, and suction created by water evaporating out of their leaves. The capillary action is created by tiny straw-like fibers that run all the way up the tree and are bunched together really tightly. Due to surface tension, water is able to “climb” the capillaries as the surface tension fills as much surface area as possible. Then at the top of the tree, as the water evaporates out of the leaves, it draws up fresh water to fill the void.
But that means the bottom of the tree should need to support the pressure of all of the water above it. But it doesn’t, because the surface tension holds the water stable inside of the trunk.
Thank you. Your hypothetical question has been a nagging, unresolved background radiation in my mind for decades, but I’d never gotten around to investigating.
Therefore a graduated cylinder that is 10m tall needs to resist the same amount of force as a dam 10m tall regardless of how much water is behind the dam. Even a thin sliver of water 1mm thick and 5m tall has the same force as a 5m lake behind the dam.
Technically only the pressures are equal, and the actual force will be linearly dependent on the area of the dam (or the surface area of the cylinder). That’s why you can make a tall water tank with relatively thin walls, but an actual dam will have to be quite thicc to handle the tensile/compressive stress (depending on the shape of the dam).
That is accounting for static bodies of water, wouldn’t there be force generated in a dynamic situation? Ie the flow of a fast river? Or if the lake is large enough tidal forces? I’m sure it’s negligible levels but still something that must be accounted for?
No, that’s absolutely true. Dynamic loads will need to be accounted for in real world examples.
Another point is that if the dam is 10m tall, it has to be built to withstand 10m of water. just because it sits at 5m most of the time doesn’t mean a heavy rain couldn’t raise the level, and if the dam collapses that’s going to be catastrophic vs just spilling over the top.
I’ve seen a few dynamic loads in my day and in my professional opinion I must agree
A somewhat political fact, but one that made some of my friends dumbfounded:
When a bank issues a loan, it generates that money literally out of thin air and credits that money to the loan account rather than using deposits they already had. For example, if you want to borrow $100,000, the banker approves the loan and doesn’t hand over cash or move existing money around - instead, they just go on their system and credit your account with the sum, that’s it.
While I think your point is true that its much more abstract than people realize. When I worked at a bank and we disbursed loans and credited/debited fees it was from “GLs” (General Ledger?) which were basically just separate accounts to help keep track. Like we had a “member service” one which was for basically anything with good reason. One time someone did a very large amount but he just basically got told to do it a different way.
Its all just in a computer. I could’ve accidentally credited someone a million dollars but it would’ve been realized when I tried to close my drawer and balance everything out. And the branch would have to be balanced at the end of the day so I assume the bank did as well.
On a related note banks take out loans from other banks. I think a lot of people don’t realize that banks have savings accounts so they have money to lend.
Which is why a “run on the Bank” or “Bank run” is unsustainable for Banks these days.
As of March 2020 the reserve requirement for banks in the US is 0%.
What the fuck, who changed that? Seems like a horrible idea.
The Fed Board, apparently: https://www.federalreserve.gov/monetarypolicy/reservereq.htm
After reading through that page and the FAQ, I think it’s because the banks should now be compelled to held reserves because Fed pays them a reasonable interest (close to what they would get if they give a very low-risk loan) on them, rather than it being a strict requirement. I don’t know enough about economics to have an opinion on whether it’s a good idea, but I feel like it’s not too horrible? Like, maybe it makes some shitty banks even more susceptible to bank runs, but that’s the reality of fractional reserve banking in general.
That Mark Zuckerberg holds several records for most fists shoved inside a human body at once
California was a state longer than Italy was a nation.
Gulp…“was”?
has been*
Rude.
Can’t be a state if it burns up
Tapsheadmeme.jpeg
Nothing insane, but the Red Hot Chili Peppers as a band are older than Guns ‘N’ Roses.
There was this racehorse named Pot-8-Os who won over 25 races and went on to sire a horse empire of winners. His father was a legend himself named “Eclipse”
Also an unbelievable fact, you responded to user Potoooooooo about Potoooooooo the horse.
I really love this story about the horse.
yesss… coincidence… hehee… *runs away*
looks into rhe distance
I guess, I will never know the truth.
A single tear slides down OP’s face
Did you also know that one of the first motion pictures was shot to measure the gate of a race horse by Leland Stanford, who would go on to create Stanford University where the eugenics movement would get its legs and horse breeding theories of genetic prowess were applied to humans, and subsequently they would use the Stanford University as a test bed to breed umbermensch that would go on to inspire the Nazis? Yes this sounds insane but all of it is true. Also college football became a method to study human combat ability for the US military.
- camera → racehorse → leland → stanford → eugenics → nazis: There’s a lot there
- camera → (developed for) → racehorse → (by) → leland: this I follow
- eugenics → (popular in european elites with racehorse breed overtones) → nazis : this I follow
- leland → (founded) → stanford : this I follow
- stanford → (created) → eugenics : this I tentatively follow, but missing the gap of an entire atlantic ocean
You should read Palo Alto by Malcolm Harris
- camera → racehorse → leland → stanford → eugenics → nazis: There’s a lot there
The bluestones in Stonehenge come from West Wales. Instead of quarrying stone from near the monument, they dragged these huge blocks from ~278km away. Likewise, the altar stone comes from ~700km away in North-East Scotland. It must’ve been very important for the ancient Britons to’ve used these specific rocks for some reason, but their religious practices were conveyed via a now extinct oral tradition so no-one knows exactly why they did it.
I thought this got debunked?
Edit: no, it was just the alter (from Scotland!) https://www.bbc.co.uk/news/articles/c207lqdn755o you are correct.
(History Channel Hair Guy)
“MAGNETS”
There is a planet in our solar system populated entirely by robots.
Shouldn’t that be 2? Mars and Venus.
Pretty sure the one on Venus is dead.
well yeah, but that’s because the native robots killed it
