Daven Henze discusses how air pollution spreads across the globe and what policymakers are doing in response.

Tracing the origin of Europe’s megaliths

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.