Does the human body really replace itself every few years? The answer is yes, but different parts of the body do so at different rates. Learn all about which parts of your body are the speediest, and which take the longest to regenerate, in this classic episode.

Selects: Thrill to the Stunning Bicameral Mind Hypothesis
50:19

How to Drink a Tree's Blood
49:07

Short Stuff: Wisdom Teeth
13:36