120. The Science of Time Travel – Part Two (2012)

A short video by science journalist Dan Falk, author of In Search of Time (St. Martin’s Press 2008).

Time travel into the future is relatively easy but what about travelling into the past? Though nothing in the laws of physics prohibits it, such a journey would seem to violate our notions of causality and free will. And then there’s the Grandfather Paradox. (10 minutes.)

See also Dan Falk’s homepage.