From the renowned, multi-disciplinary science journal PNAS (Proceedings of the National Academy of Sciences) comes the Science Sessions. Each of these short podcasts features interviews with scientists (many of whom are members of the National Academy of Sciences) who have discovered a number of fascinating topics. Recent episodes include a conversation with biologist Eve Marder about what the nervous system of crustaceans suggests about neuro-flexibility in humans; a discussion with hydrologist Andrea Rinaldo on how he and his team used cell-phone data in order to analyze human mobility patterns to uncover clues about the spread of cholera; and an interview with climate change researcher Joshua Elliot about how climate change could impact the supply of water for irrigation. These short sessions provide intriguing introductions to a variety of fields of study. Interested listeners can subscribe to the podcast on iTunes.