April 22 - April 28, 2012 (118 images)

Former Soviet President Mikhail Gorbachev (L) and actor and activist Sean Pen talk to students at Frederick Von Steuben Metropolitan Science Center as part of the 12th World Summit of Nobel Peace Laureates on April 23, 2012 in Chicago. Gorbachev was awarded the Nobel Peace Prize in 1990. UPI/Brian Kersey

Chinese men take a break from working as panda mascots promoting a website at the world's biggest automobile show, Auto China 2012, during a pre-opening day show in Beijing on April 23, 2012. China is the world's largest automobile market, with international car makers setting up massive plants and dealerships across the country in hopes of gaining a share of the fast growing domestic market. UPI/Stephen Shaver

Chinese models pose next to 'armorized' luxury cars (capable of stopping high-caliber bullets), on display at the world's biggest automobile show, Auto China 2012, during a pre-opening day show in Beijing on April 23, 2012. China is the world's largest automobile market, with international car makers setting up massive plants and dealerships across the country in hopes of gaining a share of the fast growing domestic market. UPI/Stephen Shaver

Tyra Banks reacts as Katie Couric stands on a photographers stool at the New York Women in Communications 2012 Matrix Awards at the Waldorf Astoria in New York City on April 23, 2012. UPI/John Angelillo