This is a wonderful little tribute to two of the men who have brought science into the mainstream in the past few decades.  Practically all footage and sound samples come from Carl Sagan's Cosmos series, and Stephen Hawking's Universe series.  Set to a wonderfully "hip-hop" background beat, and geniusly spliced together, this is perhaps one of the best remix videos I've ever seen done.

Frankly, if Sagan and Hawking rapping about the universe doesn't put a smile on your lips and set your toes a-tapping, then I have to say that you are NOT a geek.  Click the video above for some serious geeky goodness.