In clear, nontechnical language, string theorist Brian Greene explains how our understanding of the universe has evolved from Einstein's notions of gravity and space-time to superstring theory, where minuscule strands of energy vibrating in 11 dimensions create every particle and force in the universe. (This mind-bending theory has been testing at the Large Hadron Collider in Geneva).
Is there more than one universe? In this visually rich, action-packed talk, Brian Greene shows how the unanswered questions of physics (starting with a big one: What caused the Big Bang?) have led to the theory that our own universe is just one of many in the "multiverse."
Brian Greene - The Hidden Reality | Brian Greene, PhD, professor of physics and mathematics at Columbia University and bestselling author, spoke with Amir D. Aczel at the Museum of Science on March 2, 2011.