Welcome to Science Sessions, the PNAS podcast program. Listen to brief conversations with cutting-edge researchers, Academy members, and policymakers as they discuss topics relevant to today's scientific community. Learn the behind-the-scenes story of work published in PNAS, plus a broad range of scientific news about discoveries that affect the world around us. Please scroll down for the most recent podcasts.

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David Crowder and Gengping Zhu explain how to predict the spread of the Asian giant hornet.

Brian Fields explores a hypothesis that a supernova may be responsible for a mass extinction.

Eric Horvitz discusses AI’s promises and perils.

Juliana Vianna and Rauri Bowie explain the origin and diversification of penguins.

William Nordhaus explains the economic consequences of Greenland ice sheet melt.