Merlin Hanauer and Chase Mendenhall discuss the science of biodiversity, in the second of two recordings of a PNAS Science Cafe event held in Washington, DC on October 17, 2012.

The evolution of music from noise

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.