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.

John Hawks talks about new developments in paleoanthropology – the discovery of a new hominid species Homo Naledi in South Africa, the Neanderthal ancestry of many human populations, and the challenge of rethinking anthropological science's relationship with indigenous peoples and the general public. Hawks is the Vilas-Borghesi Achievement Professor of Anthropology at the University of Wisconsin-Madison. He is the co-author of Almost Human: The Astonishing Tale of Homo naledi and the Discovery That Changed Our Human Story

Angelina Callahan talks about the Naval Research Laboratory's Vanguard Project. While this satellite mission was part of the Cold War "Space Race," it also represented something more: a scientific platform for understanding the space environment as well as a test vehicle that would provide data for satellites of the future.

Hal Cook talks about the travels and trials of the young René Descartes, a man who spent more time traveling and fighting than studying philosophy.