Marcelo Vieira of Real Madrid celebrates with Sergio Ramos after scoring Real's opening goal during the UEFA Champions League round of 16 second leg match between Real Madrid and Lyon at Estadio Santiago Bernabeu on March 16, 2011 in Madrid, Spain.

Donny Golden shares a laugh with dancers from the Irish American Society during the 250th annual St. Patrick's Day parade March 17, 2011 in New York City. The parade honors the patron saint of Ireland and marched for the first time in the U.S. on March 17, 1762, fourteen years before the Declaration of Independence.

A man fires his pistol in the air during a celebratory rally after the United Nations approved a no fly zone over the country on March 18, 2011 in Tobruk, Libya. Libya declared an immediate cease-fire after the UN vote but reports indicate that Muammar Gaddafi's forces were still shelling two cities. (Photo by Joe Raedle/Getty Images)

In this handout photo provided by the U.S. Navy, the USS Stout launches a Tomahawk missile in support of Operation Odyssey Dawn March 19, 2011. This was one of approximately 110 cruise missiles fired from U.S. and British ships and submarines targetting about 20 radar and anti-aircraft sites along Libya's Mediterranean coast.

Revelers celebrate the Indian festival of Holi on the deck of the ship Peking at South Street Seaport in Manhattan March 19, 2011 in New York City. The Hindu festival of Holi , also known as the Festival of Colors, marks the arrival of spring where participants throw colored powder and water on one another. Many of the New York participants are Indian-American.

Emily Hasler, an English Heritage employee at Charles Darwin's home, Down House, cleans a rabbit bone in his old study on April 2, 2011 in Downe, England. Staff at the house are cleaning and preparing the property ahead of their peak visitor season. The house contains the study where Darwin wrote “On the Origin of Species”, as well as family rooms and an extensive garden that inspired the renowned scientist. (Photo by Oli Scarff/Getty Images)

Commuters walk up the redesigned subway stairs at the Tanjong Pagar subway station on August 23, 2011 in Singapore. The subway stairs have been repainted in bright colours and slogans encouraging people to take the stairs, by way of promoting fitness in the city. (Photo by Chris McGrath/Getty Images)

Suspension artist and LUSH Cosmetics employee Alice Newstead inspects shark hooks that she had pierced into her skin during a demonstration against the shark fin trade at a LUSH Cosmetic store on August 24, 2011 in San Francisco, California.