If you want to relax and learn something about Physics, I suggest you watch these lectures by Richard Feynman. They were filmed in 1964, the year before Feynman was awarded the Nobel Prize. If you ever thought about the relationship between Physics and Mathematics, that is the place to start.

PS: you have to be on Windows because Silverlight is required. Bill Gates bought the rights of the BBC documentary and decided to distribute it FREELY on the Web (great!), provided that you PAID for Windows, of course (not so great!).