As grim observances for America's notorious shooting massacres come and go, CNN's Fareed Zakaria explores mental health and guns, the Second Amendment, mass shootings, and the politics and policies of guns in America and around the world for a special edition of Fareed Zakaria GPS. Guests: Michael Waldman; Jeffrey Toobin; Dr. Amy Barnhorst, MD; Dr. Sanjay Gupta, MD. Update to original that aired December 8, 2013.

Journalist and author Fareed Zakaria hosts this in-depth look at the major global developments of the week (the title's "GPS" stands for "Global Public Square"), with an emphasis on new ideas and innovative solutions to the world's toughest problems. Each episode also features Zakaria leading a panel discussion and interviewing a major world figure.

Paris rocked by violence and its danger to French President Emmanuel Macron; the Brexit deal in peril; the future of the West; China's next great leap forward with the race to dominate Artificial Intelligence; where have all the experts gone under the Trump Administration?, bestselling author Michael Lewis joins the show to talk about his new book, "The Fifth Risk." Guests: Sophie Pedder, George Osborne, Nicholas Burns, Kai-Fu Lee, and Michael Lewis.