On the season 1 finale of "The Weirdest Thing I Learned This Week," four of our original hosts jump behind the mic to share their spookiest facts, in honor of Halloween.

The weirdest things we learned this week range from fetuses that turn to stone to a newt that sticks its ribs through its body to defend itself from predators. Whose story will be voted "The Weirdest Thing I Learned This Week"?

The Weirdest Thing I Learned This Week is a podcast by Popular Science. Share your weirdest facts and stories with us on social media:
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Rachel Feltman: www.twitter.com/RachelFeltman
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Theme Music by
Billy Cadden: www.twitter.com/billycadden

Edited by
Jason Lederman: www.twitter.com/Lederman

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