April 20, 2012 (14 images)

Chinese migrant laborers work on the grounds of China Central Television's new iconic headquarter shrouded by pollution and clouds in Beijing's central business district April 20, 2012. The past winter China's capital has seen some of the worst air pollution since the government promised more "blue sky' days after the 2008 Olympics. UPI/Stephen Shaver

George Zimmerman smiles after his bail hearing at the Seminole County Criminal Justice Center in Sanford, Florida on April 20, 2012. Zimmerman, accused in the shooting death of Trayvon Martin, had bail set at $150,000 during the hearing on second-degree murder chargers. UPI/ Gary Green/Pool

Philadelphia Flyers Braydon Coburn chases Pittsburgh Penguins Matt Cooke (24) from behind the goal as Flyers Goalie Ilya Bryzgalov looks on during the second period of game five of the NHL Eastern Conference Quarter Finals at the Consol Energy Center in Pittsburgh on April 20, 2012. The Pens defeated the Flyers 3-2. UPI/Erica Hilliard

George Zimmerman walks into the court room with sheriff deputies for his bail hearing at the Seminole County Criminal Justice Center in Sanford, Florida on April 20, 2012. Zimmerman, accused in the shooting death of Trayvon Martin, had bail set at $150,000 during the hearing on second-degree murder chargers. UPI/ Gary Green/Pool