Brian Greene Answers Your Questions

Brian Greene, author and host of NOVA's "The Fabric of the Cosmos," answers questions from Facebook and Twitter, including: 1) What is "The Fabric of the Cosmos" about?; 2) Where would you go if you had a time machine?; and 3) What's your favorite tech gadget? "The Fabric of the Cosmos" premieres November 2, 2011 on PBS.