# "Who Got Breasts First and How We Got Them" by rba

Page: https://stenobird.com/podcast/lesswrong-curated-popular-5643401/who-got-breasts-first-and-how-we-got-them-by-rba
Text version: https://stenobird.com/podcast/lesswrong-curated-popular-5643401/who-got-breasts-first-and-how-we-got-them-by-rba.md
Podcast: [LessWrong (Curated & Popular)](https://stenobird.com/podcast/lesswrong-curated-popular-5643401)
Published: 2026-06-30T06:15:46+00:00
Episode link: https://www.buzzsprout.com/2037297/episodes/19423083-who-got-breasts-first-and-how-we-got-them-by-rba.mp3
Audio file: https://www.buzzsprout.com/2037297/episodes/19423083-who-got-breasts-first-and-how-we-got-them-by-rba.mp3
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JSON: https://stenobird.com/v1/public/podcasts/lesswrong-curated-popular-5643401/episodes/who-got-breasts-first-and-how-we-got-them-by-rba
Duration seconds: 1272

## Resource

It really is Sydney Sweeney's world, and we’re all just living in it. Human female breasts are an evolutionary mystery along several dimensions. First, breast permanence is unique to humans. All other mammals develop breast prominence during pregnancy or nursing, and the mammary tissue recedes after weaning. This process is called “involution”. In contrast, humans develop breast tissue at puberty before first pregnancies and maintain it permanently after last pregnancies. Second, breasts...

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## Transcript

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