Chinese artist Song Dong stands in his installation entitled “Waste Not” in The Curve at the Barbican Art Gallery on February 14, 2012 in London, England. Waste Not comprises over 10,000 objects collected by Song Dong's mother over a period of 5 decades. The installation is Song Dong's first major solo exhibition in the UK and opens to the general public on February 15, 2012. (Photo by Oli Scarff/Getty Images)

International artist Yvette Mattern shows her stunning laser rainbow projection, Global Rainbow, on March 1, 2012 in Whitley Bay, England. The light installation celebrates the London 2012 Cultural Olympiad in the north-east of England. The Global Rainbow has previously lit up the skies of Germany, France and the United States. The projection will shine along the North Tyneside coastline for 4 days, before moving to other locations in the UK. (Photo by Bethany Clarke/Getty Images)

Russian Prime Minister and presidential candidate Vladimir Putin speaks during a rally after Putin claimed victory in the presidential election at the Manezhnya Square March, 4, 2012 in Moscow, Russia. Exit polls showed Putin had over 60 percent of the vote according to state television in an election that has been alleged to be marred by widespread violations. (Photo by Oleg Nikishin/Epsilon/Getty Images)

Chamrock, an Irish wolfhound, sports a green coat as he waits for the start of the St. Patrick's Day parade on March 17, 2012 in Chicago, Illinois. Tens of thousands took advantage of record high temperatures and sunny weather to attend the city's annual St. Patrick's Day celebration. (Photo by Brian Kersey/Getty Images)

A girl rides a broomstick in front of a green screen at the new Harry Potter Studio Tour at Warner Brothers Leavesden Studios on March 23, 2012 in London, England. The studio, which includes the actual sets and special effects departments where the films were created and shot, goes on public display on March 31, 2012. (Photo by Dan Kitwood/Getty Images)

Bo, a 55-day-old baby Echidna known as a puggle, rests in the hands of vet nurse Annabelle Sehlmeier at Taronga Zoo in Sydney November 1, 2012. The puggle was brought to the zoo after it being found by itself on a walking track north of Sydney and will be fed by hand until it is weaned at about six months of age. (Photo by Tim Wimborne/Reuters)

In this photograph taken on January 19, 2012, Indonesian schoolchildren hold on to iron cables as they cross a nearly-collapsed suspension bridge at Sanghiang Tanjung village in Indonesia's Banten province to reach their school. (Photo by Kris Aria/AFP Photo)

Starting on Monday, August 12, Perseid meteors will streak across the summer sky for a couple of nights, offering casual stargazers and serious nighttime photographers a chance to capture a glimpse of the annual meteor shower. Photo: Photographer David Kingham created this composite image from 23 photos on August 12, 2012. (Photo by David Kingham)