Demonstrators throw fire bombs to riot police during violent protests in central Athens February 12, 2012. (Photo by Milos Bicanski/Getty Images)

Sean Phillips flies through the air as he demonstrates the JetLev water propelled jet pack that is strapped to his back at the Yacht & Brokerage Show on February 17, 2012 in Miami Beach, Florida. (Photo by Joe Raedle/Getty Images)

Nicole Scherzinger attends The BRIT Awards 2012 at the O2 Arena on February 21, 2012 in London, England. (Photo by Gareth Cattermole/Getty Images)

A dog welcomes a volunteer at the “Ping An A Fu” (“Safe and Happy”) Homeless Animals Rescue Center on September 11, 2006 in Nanjing of Jiangsu Province, China. (Photo by China Photos/Getty Images)

A man dressed as a Santa Claus poses at the front of the Kollhoff Tower at Potsdamer Platz square in Berlin December 14, 2014. (Photo by Hannibal Hanschke/Reuters)

Revelers dressed as Father Frost, the equivalent of Santa Claus, dance during a parade in Almaty December 28, 2014. (Photo by Shamil Zhumatov/Reuters)

A boy jumps from a swing during sunset in Valras-Plage, southern France December 29, 2014. (Photo by Yves Herman/Reuters)

A guard dog in the suburbs of Yakutsk, Russia, considered to be the coldest city in the world, January 2014. (Photo by Amos Chapple/REX Features)