Why Do Humans Swim? Guest: Bonnie Tsui, "Why We Swim" and "American Chinatown: A People’s History of Five Neighborhoods" Swimming has mental, emotional, physical, and even spiritual effects on us. Yet, unlike other mammals, we have to learn how to swim.  Diving Sea Nomads Guest: Melissa Ilardo, Evolutionary Genomicist, University of Utah, UC Berkeley Ilardo studies the Bajau people, who are nomadic divers from Southeast Asia. Their bodies have developed larger spleens and genetic advantages that allow them to stay underwater much longer than the rest of us. Understanding these traits may help doctors treat conditions such as hypoxia.