An employee of the British Museum examines a silver coin dating from 900 AD which is part of the Silverdale Viking Hoard on December 14, 2011 in London, England. The hoard, which was discovered by local metal-detectorist Darren Webster in North Lancashire, comprises of 201 silver objects including arm-rings, coins, finger-rings, ingots, brooch fragments and fine wire braid. (Photo by Oli Scarff/Getty Images)

People walk past the 23-foot “Unitled (LAMP/BEAR)” outdoor sculpture of a teddy bear by artist Urs Fischer April 8, 2011 in New York City. The 35,000 pound sculpture of a yellow teddy bear with a working lamp will be on display for five months in front of the Seagram Building in Manhattan. The sculpture is expected to sell for more than $10 million at Christie’s Post-War & Contemporary Evening Sale on May 11. (Photo by Mario Tama/Getty Images)

People view artist David Byrne's installation "Tight Spot" beneath Manhattan's High Line park on September 27, 2011 in New York City. The 48-foot by 20-foot inflatable globe is squeezed beneath the steel support framework of the High Line and is accompanied with a rumbling audio soundtrack created by distorting Byrne's voice. (Photo by Mario Tama/Getty Images)

Fireworks light up the London skyline and Big Ben just after midnight on January 1, 2012 in London, England. Thousands of people lined the banks of the River Thames in central London to see in the New Year with a spectacular fireworks display. (Photo by Peter Macdiarmid/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)

The BMW i8 concept vehicle is displayed at a sneak preview of the car along with the BMW i3 on November 9, 2011 in New York City. (Photo by Spencer Platt/Getty Images)