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My guest today is Heather Heying – evolutionary biologist, co-host (with her husband Bret Weistein) of the Darkhorse podcast, and also the co-author of 'A Hunter-Gatherer's Guide to the 21st Century: Evolution and the Challenges of Modern Life.'

We mostly spoke about babies! On the modern guidance on breastfeeding, co-sleeping, and sleep training, and th…