ELI5: Explain Like I'm 5

Quantum inequalities

Quantum inequalities are rules that say how much energy and time can be squeezed into a tiny amount of space. Imagine if you had a really tiny room that was only big enough for a toy car. You couldn't fit a real car in there, right? Well, the same goes for energy and time. There's only so much you can cram into a small space.

Quantum mechanics is all about really tiny things like atoms and particles. And when you get down to that level, strange things start to happen. It's like a whole new world that follows different rules than we're used to in our everyday lives.

One of those rules says that you can't have too much energy and time in a really small space. If you try to pack in too much, some really weird stuff starts to happen, like particles popping in and out of existence for no apparent reason. So quantum inequalities help us understand how much we can pack in before things get too weird. It's like a speed limit for energy and time in a tiny space.