It turns out fatherhood isn't just a role — it's a biological transformation. Darby Saxbe, an award-winning psychologist at USC, draws on decades of research in Dad Brain to show how the fathering brain literally rewires itself through time and practice. Then, in the second half of the show, Emory University professor of Anthropology James Rilling traces the evolutionary story in Father Nature — how human males uniquely developed the capacity for deep parental involvement.

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