Cheese history, redating the Inca empire, and the source of the breath’s rhythm

The episode connects historical evidence and modern biological methods. Meagan Cantwell and Christie Wilcox discuss nuclear history, a gene associated with hair graying and old Swiss cheese. Lizzie Wade explains how radiocarbon evidence is changing the chronology of the Inca empire. Nicholas Bush then describes neuronal recordings and computational approaches to understanding the circuits that generate rhythmic breathing.