John Green joins the show to talk about how Everything is Tuberculosis -- which is coincidentally the name of his new book. Plus, Lauren talks about sending squirrels into space, and Rachel explains how brains can (very rarely) turn to glass.

Check out John's new book: https://everythingistb.com/

The Weirdest Thing I Learned This Week is a podcast by Popular Science. Share your weirdest facts and stories with us in our Facebook group or tweet at us!

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Space Squirrels, the Most Beautiful Youth, Glass Brains

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