The End of Everything (Astrophysically Speaking)

Ugh. Between a 4 and a 5. Dr. Mack's an excellent writer. The text was funny and informative. I did feel that it tapered off toward the end, though.

I think my problem is that I'd listened to The Universe, hosted by Dr. Mack and John Green. It was first, and I think a little better.

Still, recommended.