Biography:

Throughout history, thinkers from mathematicians to theologians have pondered the mysterious relationship between numbers and the nature of reality. Dr. Mario Livio tells the tale of a number at the heart of that mystery: phi, or 1.6180339887... Dr. Livio is head of the Science Division at the Hubble Space Telescope Institute, where he studies a broad range of subjects in astrophysics, particularly the rate of expansion of the universe.