Bathing suit models are shown listening to the radio on the beach, circa 1940's. (Photo by Bettmann Archive/Getty Images)

“Valentine Shmalentine”, 2011. (Photo by GillyFace)

Afghan security stands guard as a tractor eradicates a field of young poppy plants May 25, 2011, in Argu District, Badakshan, Afghanistan. (Photo by Paula Bronstein/Getty Images)

A fox pounces on a mouse in the snowy hills on the border of the Czech Republic and Slovakia. (Photo by Johnny Krüger/Mediadrumimages)

A competitor in fancy dress emerges from muddy water during the Tough Guy Challenge endurance race on January 29, 2012 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/Getty Images)

Participants play with water guns during the Sinchon Water Gun Festival in Seoul, South Korea, July 9, 2016. (Photo by Kim Hong-Ji/Reuters)

A devotee covered in motor oil poses for a pictures during celebrations honoring the patron saint of Managua, Santo Domingo de Guzman, in Managua, Nicaragua August 9, 2015. (Photo by Oswaldo Rivas/Reuters)

A cat receives acupuncture treatment in Shanghai, China on August 21, 2017. Traditional practitioners believe acupuncture of the body can stimulate blood circulation to promote healing and relieve some aches and pains. (Photo by Aly Song/Reuters)