Lisa Randall gives us an update on the Large Hardon Collider, dark matter, string theory, and all the latest news from the world of physics. Randall has a gift of making difficult concepts intelligible. She describes how classical physics and quantum physics differ, yet scientists think they might be able to reconcile them as new theories of atomic particles emerge. If you’re interested in where contemporary physics is going, Knocking on Heaven’s Door delivers an understandable, detailed picture. GRADE: A-