John Spear discusses the legacy of Thomas Gold's "Deep Hot Biosphere" hypothesis.

Interview with 2016 Cozzarelli Prize Winner Yayoi Obata

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.