Exploring the Idea of Things Coming in Threes

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Many natural features or phenomena come in pairs due to symmetry, but the search for distinct groups of three examples has been challenging. One intriguing example of three similar structures is found in the reproductive and waste systems of female mammals. Another example involves the three erectile bodies in the penis, consisting of two corpus cavernosum and one corpus spongiosum, although they are not identical. The quest for sets of three identical features continues.

Sometimes a seemingly silly question gets stuck in your craw and you can’t shake the feeling that something big lies behind it. We are constantly collecting these kinds of questions from our listeners, not to mention piling up a storehouse of our own “stupid” questions, as we lovingly call them. And a little while back, we noticed a little cluster of questions that seemed to have a shared edgy energy, and all led us to the same place: Our own bodies. So, today on Radiolab, we go down our throats and get under our skin, we take on evolution and anatomy and molecular cosmetics, to discover some very not-stupid answers to our seemingly stupid questions.

Special thanks to Mark Krasnow, Sachi Mulkey, Kari Leibowitz, Andrea Evers, Dr. Mona Amin, Benjamin Ungar, Praby Singh, Brye and Rachel Adler

EPISODE CREDITS:

Reported by - Molly Webster, Becca Bressler, Latif Nasser, and Alan Goffinskiwith help from Ekedi Fausther-KeeysProduced by - Sindhu Gnanasambandan, Becca Bressler, Alyssa Jeong Perry, Molly Webster with help from - Matt KieltyOriginal music and sound design contributed by - Jeremy Bloom with mixing help from - Arianne WackFact-checking by - Diane Kelley, Emily Kriegerand edited by - Pat Walters and Alex Neason

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