 This is THNK. I'm Chris Boyd. Today we're talking with someone whose family was dealt what ought to be impossible, the three in a hundred billion odds of a four-year-old and her mother both being diagnosed with brain tumors within the course of a single year. Alan Townsend is Dean of the University of Montana's W.A. Franke College of Forestry and Conservation and author of This Ordinary Stardust, A Scientist's Path from Grief to Wonder.