Trace Dominguez joins the show to explain just how inconceivable building up an immunity to iocane powder (or other poisons) is. Sara Kiley also discusses unidentified seismic objects, and Rachel talks about how peeing together transcends species.

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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