What If

Randall Munroe:

The lesson: If the optimist says the glass is half full, and the pessimist says the glass is half empty, the physicist ducks.

'What If' is a new blog by Randall Munroe, the author of XKCD, that explores theoretical physics via simple questions like “what if a glass of water was, all of a sudden, literally half empty?” or “how much Force power can Yoda output?” and then plays out the scenarios in exhaustive detail (with XKCD humor injected, of course.) The result is my favorite new thing on the entire internet. Recommended.