Here’s a video from a guy I’m a fan of, Phil Plait.

Plait writes the Bad Astronomy Blog, which I enjoy.

He is the author of Death From the Skies, which is a super entertaining science book about some potential doomsday scenarios (asteroid collision with earth, gamma ray burst, heat death of the universe, etc). I highly recommend it.

More recently, Plait teamed up with the guys at Crash Course, a fun YouTube channel where you can click on interesting things to learn about. He is doing the Astronomy Crash Course.

All of the videos are pretty interesting, but I found the one on light to be incredibly good.