Ever dream of traveling back in time? According to all the laws of special relativity, all you can do is travel forwards through time, controlling your rate by controlling your motion through space. But in General Relativity, the curvature of spacetime allows you to play with those rules a little more flexibly.

You can make it back in time, but you still can't kill your own grandpa before your parents were conceived. Find out why on this edition of the Starts With A Bang podcast!

Video version (for the first time): https://www.youtube.com/watch?v=PhCxtdxa8nI