Historian Victoria Johnson discusses the life of David Hosack, the attending physician at the Hamilton-Burr duel and founder of the nation's first public botanical garden, today the site of Rockefeller Center.

Peter Moore, writer and lecturer at the University of Oxford, discusses an 18th-century coal collier from a small port in northern England came to define an entire age.

Andrea Wulf, the New York Times bestselling author, discusses her new illustrated book "The Adventures of Alexander von Humboldt"—her second work about the intrepid explorer and naturalist.

Allison L. Strom, Carnegie Fellow at the Carnegie Observatories, shows how astronomers use the world's largest telescopes to determine the chemical DNA of even very distant galaxies.

Sean Bradley, Ph.D. candidate at the University of Washington, explores the history and development of an early text on emergency Chinese medicine, the Zhouhou beiji fang 肘後備急方 (Emergency Medicines to Keep on Hand), by the 4th-century alchemist and scholar, Ge Hong 葛洪.

Larry Nittler, Department of Terrestrial Magnetism at the Carnegie Institution for Science, discusses his use of microscopic analyses to understand what tiny grains of dust in meteorites can tell us about the evolution of stars and the matter that became the sun and planets.

H.R. Woudhuysen, rector of Lincoln College, Oxford, talks about the market for old books and manuscripts in England in the time of the Tudors and Stuarts in this Zeidberg Lecture.

Rosalie McGurk, fellow in instrumentation at Carnegie Observatories, discusses the latest technological advances to build a new, custom-designed instrument for Carnegie Observatories' Magellan Telescopes that can peer into the Universe with extreme detail.

Sujit Sivasundaram, director of the Centre of South Asian Studies at the University of Cambridge, discusses the historic gardens that existed in Sri Lanka before the arrival of the British and the changes they faced during the colonial period.

C. Pierce Salguero, associate professor of Asian history and religious studies at Penn State Abington, provides an introduction to the principles of Sino-Buddhist medicine, the product of centuries of cross-cultural exchange between medieval India and China.