Science

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Tested: Unfair Advantage?

by Rose Eveleth

Episode 5: A battle over science and ethics unfolds. World Athletics releases and then tweaks multiple policies impacting DSD athletes, while critics cry foul. In this episode, World Athletics doubles down on its claims, Caster Semenya challenges the rules again, and we dig deep on a big question: what constitutes an "unfair" advantage on the track?

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There are over eight hundred species of leeches, but researchers estimate that only ten percent of all leeches are terrestrial.

We hate to tell you this, but there are leeches that can jump

Generally, we at Short Wave are open-minded to the creepies and the crawlies, but even we must admit that leeches are already the stuff of nightmares. They lurk in water. They drink blood. There are over 800 different species of them. And now, as scientists have confirmed ... at least some of them can jump!

Interested in more critter science? Email us at shortwave@npr.org — we'd love to consider your animal of choice for a future episode!
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