A general view of the Burj Khalifa on February 23, 2012 in Dubai, United Arab Emirates. At 829.84 m (2723 ft) tall the Burj Khalifa is currently the tallest building in the world. (Photo by Chris Jackson/Getty Images)

Jimmy Fallon and Madonna sign the Facebook wall before their livestream interview at the Facebook offices on March 24, 2012 in New York City. (Photo by Dimitrios Kambouris/Getty Images)

New Zealand Paralympic swimmer Cameron Leslie poses for portrait at the Millennium Pool on March 26, 2012 in Auckland, New Zealand. (Photo by Hannah Johnston/Getty Images)

A Hawker Hurricane Mk XIIa 5711 (G-HURI) fighter aircraft prepares to perform an aerobatic display at the IWM Duxford on October 18, 2012 in Duxford, England. The aeroplane, similar to those that defended British shores during the Battle of Britain in World War II, is due to be auctioned by Bonhams in their sale of “Collectors' Motor Cars and Automobilia” at Mercedes-Benz World Brooklands on December 3, 2012. The plane was built in 1942 and joined the Royal Canadian Air Force the following year, where it remained for the duration of the war, it is expected to fetch up to 17 million GBP. (Photo by Oli Scarff)

Head of Global Marketing, Volkswagen Group Luca de Meo speaks onstage during the U.S. reveal of the 2012 Volkswagen Beetle at Pier 36 on April 18, 2011 in New York City. (Photo by Michael Loccisano/Getty Images for Volkswagen)

A volunteer approaches a male toad to pick him up from a road near Berlin on March 18, 2012 in Gueterfelde, Germany. (Photo by Sean Gallup/Getty Images)