For you arrow-of-time freaks who have been looking for a quick and engaging intro to the issues (maybe to show your friends to get them to appreciate your obsession), here's a guest spot I did for the terrific Minute Physics series illustrated by Henry Reich. If you're not already familiar with them, check out the entire series.
Previously I did one on dark energy. It came out right after the Nobel Prize announcement, but don't let that trick you into thinking I won the Prize myself. (Some people were tricked.)
Meanwhile, in a parallel universe, instead of writing Spacetime and Geometry, I wrote a massive tome on Cosmology. This parallel universe was featured on this week's episode of Fringe. Here's Walter Bishop retrieving his copy from Peter.
I helped with some of the equations on the episode. Thanks to Glen Whitman and Rob Chiappetta for the shout-out.