Part 5 of the TED Radio Hour episode Shifting Time
About Sean Carroll's TED Talk
Cosmologist Sean Carroll tackles a deceptively simple question: Why does time exist at all? The potential answers point to a surprising view of the nature of the universe, and our place in it.
About Sean Carroll
Sean Carroll is a theoretical physicist at California Institute of Technology, where he researches theoretical aspects of cosmology, field theory and gravitation. Carroll's book on cosmology and time, From Eternity to Here: The Quest for the Ultimate Theory of Time, was published in 2010. He keeps a regular blog at Cosmic Variance.