r/explainlikeimfive

How are machines like forklifts skid steers etc so capable of lifting such heavy loads?

I’ve noticed that sometimes when I’m pulled an all-nighter or I'm way past my bedtime, I suddenly go from feeling like a zombie to being wide awake and full of energy. It feels like my brain just decided to drink three espressos out of nowhere, even though I haven't had any caffeine.

How does our body suddenly find this hidden energy when we should be crashing? Is it actually "fake" energy, and do we pay a price for it the next morning?

Remote control model planes and helicopters have been around for decades, after all.

I am learning electricity in physics right now, I understand resistance, electric currents, magnets, electric fields and electric charges but voltage makes no sense to me. My physics teacher tried to explain it, my dad who knows physics tried to explain it and I have watched videos about it but I still don't get it.

For example, things like color, taste, and sound depend on how our brain processes signals.

Does that mean our overall experience of the world is also something the brain constructs? If yes, how does that actually happen?

And how is it that everyone seems to see and experience things in roughly the same way?

And can it still pump outside the body for a couple of seconds/minutes before stopping?

Like how did they figure out that d(x^2)/dx= 2x and vice versa for integration. Other operations like addition, multiplication, subtraction makes sense but how do u find what the integral of 1/x is and so forth.

Several web sites have asked me if I want to make a passkey. I don't know what that means and if it's to my benefit.

I find it hard to believe that a robot or AI is unable to click the "Are you human?" box, as well as the more "difficult" captcha that involves identifying which pictures contain a bus or bicycle, especially if they already completed their task far enough to end up at the captcha box. It isn't exactly a good security measure and I don't understand the existence of this, or atleast why something else hasn't been put into place due to how intelligent robots and AI have gotten throughout the years

Eg, if an old car gets crushed at a junk yard, or there’s a dumpster full of random objects made from any number of different types of metal - how are these recycled?

Do they just get melted down together to form a massive block of random metal alloy, and used in that form for… something? Or is there a way of separating out all the original metals for re-use?

See also: when a whole intact car gets crushed down to a block of about a cubic yard, including metals, plastic, rubber and everything else: what then?

I see this floating around trading and finance subs, what is it and what is the significance of it?

Originally, I thought the brain stored memories like the files in a computer. You throw them in the hard drive, leave them there until you need it, pick it back up, and boom you remember.

However the problem I've noticed with this is that files on a computer stay the same no matter how much time passes. A jpg of a dog isn't going to become a jpg of an elephant. Memories on the other hand do change over time. So relating how the brain stores memories to a file system doesn't work.

So, how does the brain store and callback memories?

Okay, I have 2 theories. To maintain pressure and ensure the sewage flows away from origin, either

1. A system pressurize the sludge is utilized.

2. A downward gradient from origin to out is maintained.

3. seems unlikely to me having not seen any pressurizing unit at most places.

In that case, if 2) is true, how does one get a contant downward gradient for the severs when the geography around has so many extreme ups and downs? Even a 1 degree downward slope over many miles would be hard to achieve.

For example, I once bought a CD (Billy Hatcher and the Giant Egg). It told me the game wouldn't work on my Windows 7 computer for some reason, only on Windows Vista

Another example, I try to find an old game on the app store. It tells me it's not compatible on my newer phone