Fourth grade student Joy English of Central Intermediate School in Washington, Ill., lifts her President Obama mask during instructor Jane Woith's Wax Museum Hall of Presidents, Feb. 16, 2012. Students in Woith's social studies classes portrayed the U.S. presidents as a class project as President's Day nears. (Ron Johnson/Journal Star/AP Photo)

Brazilians perform capoeira on the first day of Carnival celebrations, Feb. 16, 2012 in Salvador, Brazil. Capoeira is a Brazilian martial art and dance form that was developed by slaves in the region. Carnival, the grandest holiday in Brazil, starts on Fat Tuesday, the Tuesday before Ash Wednesday. (Mario Tama/Getty Images)

Nora, a Rothschild giraffe, stares at the camera at Prague Zoo in Prague, Czech Republic, Feb. 17, 2012. (Petr David Josek/AP Photo)

Maria Hernandez stands behind a fence as she waits for information about her relative outside the morgue in Tegucigalpa, Honduras, Feb. 16, 2012. Relatives have arrived at the morgue from the city of Comayagua, where a fire broke out at the city's prison, killing over 300 inmates. (Fernando Antonio/AP Photo)

Supporters of India's ruling Congress party listen to Indian Prime Minister Manmohan Singh at an election rally in Kanpur, India, Feb. 17, 2012. Elections in Uttar Pradesh, India's most populous and politically crucial state, are being currently held in seven phases. (Rajesh Kumar Singh/AP Photo)

Dustin Martin of the Tigers is tackled by Levi Greenwood of the Kangaroos during the round one NAB Cup AFL rugby match between the Richmond Tigers and the North Melbourne Kangaroos at Etihad Stadium, Feb. 17, 2012 in Melbourne, Australia. (Quinn Rooney/Getty Images)

A homeless woman weaves a colorful rope with rags to earn her living in Karachi, Pakistan, Feb 17, 2012. (Fareed Khan/AP Photo)

A four-day-old eastern lubber grasshopper hops a ride on the head of one of its older siblings at Brookfield Zoo's Swamp exhibit in Brookfield, Ill, Feb. 16, 2012. The species, which is native to the south-central portion of the United States, turns a brilliant green and orange when it reaches adulthood. (Jim Schulz/Chicago Zoological Society/AP Photo)

Chinese people watch Li Hongxiao, center, using his teeth holds up 23 wooden benches, each one-meter-long with total weight of 152 pounds in Dazu district in southwest China's Chongqing Municipality, Feb. 16, 2012. (AP Photo)

Philadelphia Flyers center Maxime Talbot (27) reacts after colliding with Buffalo Sabres defenseman Tyler Myers (57) in the second period of an NHL hockey game, Feb. 16, 2012 in Philadelphia. The Flyers won 7-2. (Alex Brandon/AP Photo)