This week, we’re discussing the function, evolution and complicated social norms attached to the human female breast. Guest host Rachelle Saunders talks to freelance health and science journalist Florence Williams, about her New York Times notable book  Breasts: A Natural and Unnatural History. And researcher and blogger Scicurious returns to discuss the work of a French researcher who claims that wearing a bra can harm, rather than help, attempts to ward of the effects of gravity.