Chapter 24 Videos
Here's a few videos from YouTube and other places that might help reinforce the subjects at hand:
Big Bang THEORY!! 34:32
EMR-Intro thru Visible
EMR-UV thru Gamma
Big Bang
Big Bang
Hertzsprung Russell
Hertzsprung Russell
Hertzsprung Russell
Hope these help... keep an eye out, I'm always trying to update them.