In November 2011, Lisa Randall spoke to an audience at the Brattle Theatre in Harvard Square about her new book, Knocking on Heaven's Door. In this hour-long video, we offer you a complete, unedited version of her talk.

Lisa Randall is the Frank B. Baird, Jr. Professor of Science in the Department of Physics. Her research connects theoretical insights to puzzles in our current understanding of the properties and interactions of fundamental particles as well as cosmology. She has developed new conceptual frameworks and models that explore extra dimensions of space, supersymmetry, dark matter, baryogenesis, and the Standard Model of particle physics. Randall's research also involves finding new ways to experimentally test and verify ideas, with a current focus on experiments at the Large Hadron Collider at CERN.