There are more trees on earth by far than there are stars in the galaxy.
this post was submitted on 20 Jan 2025
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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
Printer ink costs more per milliliter than human blood.
- 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.
Rojava exists.
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.
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
Thank you. Your hypothetical question has been a nagging, unresolved background radiation in my mind for decades, but Iโd 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.
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
That Mark Zuckerberg holds several records for most fists shoved inside a human body at once
Nothing insane, but the Red Hot Chili Peppers as a band are older than Guns 'N' Roses.
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