What’s so weird about Quantum Mechanics

I think I can safely say that nobody understands quantum mechanics.”
(R. Feynman)

Richard Feynman, probably smoking because he was trying to cope with quantum mechanics.

Quantum Mechanics (QM) is the “best” theory of the world physicists have at the moment (at least of everything apart from gravity). But it’s infamously hard to wrap one’s head around what it actually means. It’s probably the first time in physics where it becomes really apparent that the mathematical language in…