Time may not seem all that controversial, but to scientists it’s a debatable topic. Adam Frank is a professor of Astrophysics at the University of Rochester in New York and a regular contributor to Discover and Astronomy magazines. He's also the co-founder of the 13:7 Cosmos and Culture blog on NPR. His book About Time: Cosmology and Culture at the Twilight of the Big Bang is published by Simon and Schuster. Frank spoke with Bonnie North from his office in Rochester.