Robina Shaheen and Mark Thiemens discuss an oxygen isotope signature that reveals how carbonates on Mars form in the absence of life.

Interview with Cozzarelli Prize Winner Liza Moscovice

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.