Do you know what the hell is the Schwarzschild radius? I didn't have a clue, but now I know that if you compress Earth to an 8mm radius ball, you will get a black hole. My fascination didn't stop there.
I've spent all morning mesmerised by these videos—created by a bunch of extremely smart people at the University of Nottingham—which explain the most common symbols in physics and astronomy so any moron like me can understand them. And if you like physics and astronomy, you should probably do exactly the same. [Sixty Symbols]