If you've got half a heart it's an easy question to answer. But if you're happy living without polio and hepatitis B you may want to question further. Learn about what makes chimps special and the history of medical testing in this episode.
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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