Professor Markus Buehler, novelist Barbara Kingsolver and ecologist David Goulson were guests on a recent episode of The Forum, a BBC radio program that features ideas and discussion with some of the worlds “most eminent minds.” “Fragility: What is it That Makes Materials and Ecosystems Prone to Fracture?” aired June 9. Buehler studies the fracture behavior of natural materials like bone and spider silk. Kingsolver’s latest novel, “Flight Behavior,” explores climate change and the life cycle of the monarch butterfly. Goulson studies the ecology, behavior and conservation of wild and commercially bred bumblebees. Listen to the podcast (available through the first week of July).