 You're listening to Think. I'm Chris Boyd. Today we're talking about a story that sounds impossible. A four-year-old girl and her mother both diagnosed with unrelated brain tumors in the course of the same year. My guest is Alan Townsend, dean of the University of Montana's W.A. Franke College of Forestry and Conservation and author of a memoir about this experience called This Ordinary Stardust, A Scientist's Path from Grief to Wonder.