The Nothing Behind Everything

This week, Radiolab revisits two conversations from the archives that explore imperceptible parts of the world. The first conversation is inspired by Alan Lightman's essay "The Accidental Universe" and features Robert Krulwich discussing the latest developments in theoretical physics with Brian Greene. They discuss how physics has reached a limit in what can be seen and tested, leaving only mathematical equations that can't be verified. The conversation raises questions about the crisis in science and the nature of the universe. The second conversation is with Jim Holt, author of "Why Does the World Exist?", who explores the idea that solid objects are mostly made up of empty space. Robert and Jim debate whether the universe is composed of solid bits and pieces or a cloudy foundation that resembles thoughts and ideas. The conversation delves into the philosophical implications of subatomic particles and the nature of matter. Radiolab invites listeners to sign up for their newsletter, which includes short essays, recommendations, and details about other ways to interact with the show. The podcast is supported by listeners and foundations, including the Simons Foundation, the John Templeton Foundation, and the Alfred P. Sloan Foundation. Listeners can follow Radiolab on social media and share their thoughts by emailing radiolab@wnyc.org.