Janet Braam and E. Wassim Chehab discuss how plants anticipate and defend against insect attacks.

Interview with 2012 Cozzarelli Prize Winners Andrew Zammit-Mangion, Michael Dewar,Visakan Kadirkamanathan, and Guido Sanguinetti

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.