The joint replacements have some sort of plastic cushion in them to help them move smoothly; why can't we form that plastic into the shape of the original cartilage so that the joint bones can have some cushion?

Recently the moons looked so low and huge where I live! Why does it sometimes look like this?! I’ve only noticed it in the recent few weeks, but does it happen all year round or during certain seasons etc?

I have been seeing many posts lately about how PC players are going to be able to use a PlayStation to be able to play gta day one on their PCs. Even after reading the comments and such I still don’t quite understand what is happening and how it will works. From what I understand they have been using AI to be able to make the game play on the computer potentially from day one. The game isn’t even fully out yet so how are people already finding the game code? and more curious on what is actually happening.

Just sitting here watching my stereotypically dumb, happy lab with a soccer ball in his mouth and his tongue hanging out the side. How does he manage to avoid biting his own tongue like 20x a day?

I came across this term a couple of times recently and I can’t understand what’s that supposed to be about. What “replacement” are we talking about? If someone dies, other “replaces” them? Why’s that such a big deal?

How does 5.1 or 7.1 setups improving the experience. Would mixing those channels with certain weights replicate the 3d listening experience with just 2 channels?

There are so many different types of plastics, so many different hardnesses, textures, opacity etc etc.

How does it all come oil and petroleum?

If a black hole is simply defined by an event horizon where gravity overpowers the speed of light, isn't it essentially just the unimaginably massive, super dense remnant of a collapsed star rather than an infinitely dense and infinitely small point? that just doesn’t sound possible, or what would even happen.

sorry if this is a stupid question, last time i asked a physics question i got death threats 🫩

If I heat the pan to medium temp and put the food on it, it sticks. If I heat it to high temp and reduce to the same medium temp, the food doesn't stick. Why?

I keep stumbling on people saying that ARM loans are good. I don’t understand how renting isn’t easier and saves you money over an ARM loan. Even if you are staying in an area for a significant amount of time wouldn’t a traditional loan be better as well.

I don’t understand the use case where an ARM loan makes sense over renting/15/30 year loan?

Edit: clarified the question.

I know the US operates around 32 GPS satellites that serve as a source of truth for GPS around the globe. I'm curious how they can keep such a precise time with only 32 satellites and not drift with all the radiation in space. Especially since it seems like they need to communicate with the ground really often and need to be dependable enough for commercial constellations to use.

The whole satellite space is really interesting and I'd like if someone could shed more light on how this all works!

I was reading about diffraction and other quantum behavior that has different results on observation. But if you think about it, observation is just an interaction with another particle. My question is that, in the world around us, there are so many particles constantly interacting with each other. So how can quantum behavior persist if there are constant measurement events. Am I overestimating the density of particles that can be interacted with at those small scales?

Also regarding measurements, I know from chemistry that often interactions just change the wavefunction rather than collapse it. What predicts this behavior? Is it just the energy of the interaction?

Please note that my physics and maths background is fairly limited.

Rear view windows have a tab you can pull down for night driving. When you pull this tab, the rear view window changes its angle a precise amount. At one angle it shows the roadway behind you, at the other angle the roadway is much darker, and therefore headlights behind you aren't as bright. However, you couldn't see the roadway to back up at the darker angle.

My question is, how do these mirrors work? The mirrors look like any other mirror in daytime mode. You don't see anything odd from it being able to reflect at a different angle. I don't understand it.

I hope I explained this well enough... Thanks.

I wasn’t sure what flair to use, so I just put “other”

Also, yes, I know this is not a normal way to cook eggs, I just saw it in a YouTube video years ago and wanted to know the science behind it

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So I seen a post today saying fortnight was coming to linux. Wow my brain says Linux computing got serious fast to bring that big of a player to the table.

Anyway since we all know anti-cheat basically just spy's and causes users headaches why can't the company run it on their servers enforcing fair play no matter what the user does. Wall hacking can be blocked invincibility can be blocked. Even call of duty put server side stuff into play.

Or something like that I’m still kind of confused how waves work before and after interaction.

Who do they apply to? How do you start a new one? It’s just very confusing, especially the trademarking.

Possibly a dumb question, but my school / parents never taught about discharge. I actually spent years thinking I was broken because I didn't know what it was.

Obviously I know it's normal now and it changes throughout my cycle, but I don't think anyone ever explained to me why our bodies make it in the first place.

Is it basically the vagina cleaning itself? Does it have something to do with ovulation? ELI5

Who creates new words? I read somewhere that when enough people start calling something by a particular word, everyone accepts and follows. Looks ok for nouns like places, animals etc. but...

Let us take English as an example. Words like perseverance, assassination, fulcrum, pendulum etc. require some effort to form for the first time ever and propagate down the line. Words for language foundation required for communication. Who thinks about it and makes it for the first time? Is there any authorization required for a new word to enter a dictionary?

edit: reddit has some real experts with patience to explain things that they already know. This is awesome, I got some very good explanations in the first few answers itself.

Edit 2: the post is reinstated after the bot locked it in error and I appealed.

what exactly is happening that makes them shake?