Dr. Joy McCann discusses the great circumpolar ocean that surrounds Antarctica. She is a historian at the Centre for Environmental History at Australian National University and the author of Wild Sea: A History of the Southern Ocean.

Erika Milam talks about the scientific search for human nature, a project that captured the attention of paleontologists, anthropologists, and primatologists in the years after World War II. Milam is a professor of history at Princeton University. She is the author of Creatures of Cain: The Hunt for Human Nature in Cold War America.

Dr. Beth Taylor discusses the science and psychology of running. Taylor is an Associate Professor of Kinesiology at the University of Connecticut. She also serves as the Director of Exercise Physiology Research at Hartford Hospital.

Annette Joseph-Gabriel talks with Tiffany Gill about the history of African American travel in the late twentieth century and its importance to black communities across the lines of class and gender. Joseph-Gabriel is an assistant professor of French at the University of Michigan, College of Literature, Science and the Arts. Gill is an Associate Professor of Africana Studies & History and Cochran Scholar at the University of Delaware. She is the co-editor of To Turn the Whole World Over: Black Women and Internationalism.

In 1845, the two British naval ships left England with 129 men in search of the Northwest Passage. They were never heard from again. Professor Russell Potter talks about the expedition and the reasons why it continues to fascinate people around the world. Potter is the author of Finding Franklin: The Untold Story of a 165-year Search