Physics
The EPR Paradox: Spooky Action at a Distance
Quick fact
The EPR paradox was published in 1935 by Albert Einstein, Boris Podolsky, and Nathan Rosen. Einstein called the instant correlation 'spooky action at a distance' and used it to argue that quantum mechanics was incomplete.
Why this is interesting
Imagine two particles that are connected in such a way that measuring one instantly influences the other, no matter how far apart they are. It sounds like science fiction, but this was the reality proposed by Einstein, Podolsky, and Rosen in a famous paradox that challenged the very foundations of quantum mechanics.