Rose Eveleth joins the show to talk about chromosome testing in the Olympics. Plus, Claire returns to talk elite tug-o-war, and Rachel talks about the leech that can fly.

Listen to Rose's new show, Tested: https://link.chtbl.com/js0J2gTx

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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Links to Rachel's TikTok, Newsletter, Merch Store and More: https://linktr.ee/RachelFeltman 

Rachel now has a Patreon, too! Follow her for exclusive bonus content: https://www.patreon.com/RachelFeltman

Link to Jess' Twitch: https://www.twitch.tv/jesscapricorn

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Rachel Feltman: www.twitter.com/RachelFeltman

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