Until recently, scientists assumed humans were the only species in which females went through menopause, and lived a substantial part of their lives after they were no longer able to reproduce. And they had no idea why that happens, and why evolution wouldn’t push females to keep reproducing right up to the end of their lives. But after a close look at some whale poop, and a deep dive into chimp life, we find several new ways of thinking about menopause and the real purpose of this all too often overlooked second act of life. Special thanks to Danielle Friedman, Rachel Gross, and Kate Radke.EPISODE CREDITS: Reported by - Heather Radke and Becca BresslerProduced by - Sarah Qari and Becca BresslerFact-checking by - Emily Kriegerand Edited by - Becca BresslerEPISODE CITATIONS:Books - Check out everything Heather Radke writes, including Butts: A Backstory, cause it’s all that good, here: Heather Radke (www.heatherradke.com).Find any one of Lucy Cooke’s book, including Bitch:On the Female of the Species, here: Lucy Cooke (http://www.lucycooke.tv/)And check out everything Caroline Paul has on offer, including Tough Broad, here: Caroline Paul (https://www.carolinepaul.com/) Socials - Heather Radke: https://www.instagram.com/radhradkeLucy Cooke: https://www.instagram.com/luckycooke/Audio:Becca Bressler’s greatest hits- Bloc PartyOur Stupid Little BodiesGigaverseLateral cuts - Butt StuffSignup for our newsletter!! It includes short essays, recommendations, and details about other ways to interact with the show. Sign up (https://radiolab.org/newsletter)!Radiolab is supported by listeners like you. Support Radiolab by becoming a member of The Lab (https://members.radiolab.org/) today.Follow our show on Instagram, Twitter and Facebook @radiolab, and share your thoughts with us by emailing [email protected] support for Radiolab’s science programming is provided by the Simons Foundation and the John Templeton Foundation. Foundational support for Radiolab was provided by the Alfred P. Sloan Foundation.