Dr. Vanessa Heggie talks about the history of biomedical research in extreme environments. Heggie is a Fellow of the Institute for Global Innovation at the University of Birmingham. She is the author of Higher and Colder: A History of Extreme Physiology and Exploration.

Sean Cocco talks about the 1631 eruption of Vesuvius and its impact on Renaissance science and culture. Cocco is an associate professor of history at Trinity College. He is the author of Watching Vesuvius: A History of Science and Culture in Early Modern Italy.

Shayne Legassie talks about Medieval travel, especially long distance travel, and the way it was feared, praised, and sometimes treated with suspicion. He also talks about the role the Middle Ages played in creating modern conceptions of travel and travel writing. Legassie is an associate professor of English and Comparative literature at the University of North Carolina, Chapel Hill. He is the author of The Medieval Invention of Travel.

Cole Kelleher talks about his work for the Polar Geospatial Center at the University of Minnesota, an agency that uses satellite data to make cutting-edge maps for the support of polar scientists in the field.

Neil Maher talks about the social forces that shaped NASA in the 1960s and 1970s, connecting the space race with the radical upheavals of the counterculture. Maher is a professor of history at the New Jersey Institute of Technology and Rutgers University, Newark. He is the author of Apollo in the Age of Aquarius.