Time Travel discussion

This is a lecture by a hip phycisist explaining time travel in reality and in science fiction.

I only knew him as a movie blogger on a popular movie website, had no idea he was a leading physist. Most of us here will be familiar with much of his lecture (and a certain movie chart) but he has a fun way of presenting the material.

http://www.youtube.com/watch?v=-csNOQ...

Very Cool.