Lisa Randall - Physicist and cosmologist, Frank B. Baird, Jr. Professor of Science at Harvard University

The latest developments in physics may force us to radically revise what we know about the world: its composition, its evolution, and the fundamental forces that drive its operation. Lisa Randall, a leading voice in theoretical physics and cosmology, recounts current research developments and describes the nature of scientific thinking, explaining how experiments today are expanding the frontiers of knowledge.