I'm no physics expert, but from what I remember from college, once you get past the basic laws of physics governing movement and massive bodies and descend into the nitty gritty, logic seems almost to disappear. "What do you mean particles are waves? That can't possibly be true!" But this is why physics is beautiful to me. While the math is entirely over my head, the findings never cease to amaze me.

Here's a really cool attempt at explaining the "Many Worlds Interpretation" of quantum mechanics from the Scienceblogs website.

Read that and tell me your brain doesn't hurt.