Professor Mona Fawa on the situation in Lebanon, Hezbollah's role, and where public opinion in the country lies. Climate policy expert Leah Stokes and former Rep. Bob Inglis (R-SC) on climate change policies in the U.S. Meryl Streep, Fawzia Koofi and Habiba Sarabi on the new documentary, "The Sharp Edge of Peace." Malcom Gladwell on his new book, "Revenge of the Tipping Point."