This 2015 episode examines that humans have always longed to explore underwater, but need to breathe air. From as far back as the 4th century B.C.E., clever inventors have been designing technology to give us face time with the creatures of the sea.

Behind the Scenes Minis: Progressive Medicine
22:11

Coley's Toxins and the Origins of Immunotherapy
38:27

Philippe Pinel
39:12