This picture taken on January 25, 2015 shows a participant taking part in an ice water challenge in Zhangjiajie, central China's Hunan province. Participants were required to stay in an ice pond, holding an ice block while eating ice-cream with an electric fan blowing at them. (Photo by AFP Photo/Stringer)

These stunning pictures show a normally vicious tiger calmly swimming in a pool of algae, on Jule 9, 2014. The powerful cat takes a refreshing break by taking a dip in the bright green algae. But it looks like this big cat is scared of getting his head wet as he strains to keep it above the water. After splashing around for a bit the tiger gets out and tries to air-dry with specks of the vegetation dripping off his fur. The striking pictures were taken at Copenhagen zoo by snapper Soren Lundgren Neilson. (Photo by Soren Nielsen/Caters News)

Lilly Caron, 8, of Bridgeton, Maine, Jason Homchick, of San Diego, and Lilly's father Jason Caron, (obscured), ride the Sky Swing at Seacoast Adventure, Thursday, July 14, 2016, in Wyndham, Maine. The 100-foot-tall swing gives riders the combined thrills of sky diving and hang gliding. (Photo by Robert F. Bukaty/AP Photo)

Russian soldiers write home while serving on the Eastern Front during World War I, circa 1915. (Photo by Hulton Archive/Getty Images)

A girl carries breads on her head as she walks in the snow, in Kabul, Afghanistan, Tuesday, February 8, 2022. (Photo by Hussein Malla/AP Photo)

Two monitor lizards wrestle at Singapore Botanic Gardens on February 7, 2022. (Photo by Xinhua News Agency/Rex Features/Shutterstock)

A Ukranian soldier hugs his wife in the city of Irpin, north of Kyiv, on March 10, 2022. Russian forces on March 10, 2022 rolled their armoured vehicles up to the northeastern edge of Kyiv, edging closer in their attempts to encircle the Ukrainian capital. Kyiv's northwest suburbs such as Irpin and Bucha have been enduring shellfire and bombardments for more than a week, prompting a mass evacuation effort. (Photo by Aris Messinis/AFP Photo)

A student works on her skills during an acrobatics class near the pier in Huntington Beach, CA on Monday, August 17, 2020. Instructors at the Orange County Performing Arts Academy decided to bring the class to the beach from Anaheim Hills to beat the heat and give the students an end of the summer treat. (Photo by Paul Bersebach/The Orange County Register via AP Photo)