So, remember a few weeks back when CNBC gave in and decided Jim Cramer would go on the Daily Show after all. Well, that late booking meant a previously scheduled guest was bumped. That guest, Tom Zoellner, appeared on the show Thursday night. Zoellner has written a new book about and called Uranium. So, if you want to know all about that silvery-white element that’s causing so much global grief, watch the clip.

Zoellner, a contributing editor for Men’s Health, also happens to be a mediabistro.com instructor.