Quantum entanglement is a thing, apparently. It's like when you're trying to get a cat to take a selfie, but the cat's all like "no, human, I'm over here, in this other dimension, and I'm going to entangle with this particle, and you can't have my picture, you're just going to have to deal with the cat's quantum uncertainty."
But seriously, folks, quantum entanglement is when two particles become connected in such a way that what happens to one affects the other, even if they're on opposite sides of the universe. It's like a cosmic game of telephone, but with particles.
Learn about entanglement superposition, where things get really weird. Explore entanglement decoherence, where things get even weirder.