Too often, Dr. Pauline Chen argues, the focus on keeping patients alive gets in the way of helping those who are approaching death. Chen shares her experiences as a medical student and transplant surgeon -- the subject of her book Final Exam: A Surgeon's Reflections on Mortality -- and how they've shaped the way she practices medicine.

Patrick Anthony discusses the Prussian naturalist and explorer, Alexander von Humboldt, the world's most famous explorer in the early 1800s. Famed and admired for his 1799 expedition to South and Central America, Humboldt has been rediscovered by a new generation of scholars on both sides of the Atlantic. Anthony is the author of "Mining as the Working World of Alexander von Humboldt's Plant Geography and Vertical Cartography." Isis 109, no. 1 (2018): 28-55.

Ingrid Horrocks talks about the way women travelers, specifically women wanderers, are represented in late-eighteenth century literature. Horrocks in an associate professor in the School of English and Media Studies at Massey University in Wellington, New Zealand. She is the author of Women Wanderers and the Writing of Mobility, 1784–1814.

Martin Thomas discusses the 1948 Arnhem Land expedition and the controversy that surrounds it. His new documentary, Etched in Bone, which he co-directed with Beatrice Bijon, traces the events of the expedition and its effects upon the aboriginal communities of Northern Australia. Thomas is a professor of history at the ANU College of Arts and Social Sciences.

Dr. Alistair Sponsel talks about Darwin's experiences on HMS Beagle and his early career as a naturalist. Sponsel's close reading of Darwin's journals and letters reveals insights about the man that would become known as the father of evolution. Sponsel is the author of Darwin's Evolving Identity: Adventure, Ambition, and the Sin of Speculation.