A competitor poses before the Tough Guy Challenge endurance race on January 27, 2013 in Telford, England. Every year thousands of people run the 8 mile assault course which involves freezing temperatures, fire and ice. (Photo by Michael Regan)

An employee at Christie's auction house examines a complete sub-fossilised elephant bird egg on March 27, 2013 in London, England. The elephant bird egg is expected to fetch 30,000 GBP when it features in Christie's “Travel, Science and Natural History” sale, which is to be held on April 24, 2013 in London. (Photo by Oli Scarff)

“I have seen batches of banknotes worth more than $2.6 million, but beyond all doubt, gold bars look much more attractive!”. – Shamil Zhumatov. Photo: Cooling-down gold ingot. March 14, 2013; Tien Shan mountains, Kyrgyzstan. (Photo by Shamil Zhumatov/Reuters)

A couple throw themselves into an energetic jive at a studio in London.

“The Amish, sometimes referred to as Amish Mennonites, are a group of Christian church fellowships that form a subgroup of the Mennonite churches. The Amish are known for simple living, plain dress, and reluctance to adopt many conveniences of modern technology”. – Wikipedia

Photo: An Amish farmer plows his field behind six draft horses June 2, 2011 in New Wilmington, southwestern Pennsylvania. (Photo by Jeff Swensen/Getty Images)

The attendants of the Sumptha Raja, Agra Durbar. (Photo by Hulton Archive/Getty Images). 1873

(L-R) Zandea,18, and Jessica, 21, pose showing off their clothing backstage during a show featuring OPT jeans December 8, 2011 in Yangon, Myanmar. (Photo by Paula Bronstein /Getty Images)

Dance Team Rage Crew perform at BAFTA LA's 6th Annual Christmas Party and Toy Drive at Helen Keller Park on December 17, 2011 in Los Angeles, California. (Photo by Frazer Harrison/Getty Images)