Children pour cold water on themselves under the control of fitness coach Margarita Filimonova (R) at local kindergarten number 317, with the air temperature at about minus 23 degrees Celsius (minus 9.4 degrees Fahrenheit), in Russia's Siberian city of Krasnoyarsk, February 5, 2013. (Photo by Ilya Naymushin/Reuters)

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A woman sits on a curb at the scene of a shooting outside of a music festival along the Las Vegas Strip, Monday, October 2, 2017, in Las Vegas. Multiple victims were being transported to hospitals after a shooting late Sunday at a music festival on the Las Vegas Strip. (Photo by John Locher/AP Photo)

Opossums on their mothers back at a game reserve in Central Minnesota, USA, on September 2, 2013. (Photo by Caters News Agency)

A competitor participates in the Tough Mudder challenge near Henley-on-Thames in southern England May 2, 2015. (Photo by Eddie Keogh/Reuters)

Guo Meiling of China jumps her Mini into the road during the 38th Dakar Rally in Arrecifes, Argentina, January 2, 2016. (Photo by Reuters/Stringer)

Men work on a large hookah at the Taha factory in Baghdad, Iraq July 2, 2016. (Photo by Khalid al Mousily/Reuters)

A man sleeps at Beirut's Corniche, a seaside promenade, in Lebanon May 2, 2016. (Photo by Alia Haju/Reuters)

Waves hit the seawall during heavy seas and high winds in Dawlish in south west Britain, February 2, 2017. (Photo by Toby Melville/Reuters)