Young man making the O.K. sign. (Photo by George Marks/Retrofile/Getty Images). Circa 1950s

Juno, a Beluga whale, greets a young viewer at the Mystic aquarium in Connecticut, USA on December 5, 2015. (Photo by Tim Clayton/Corbis)

Young U.S. visitors pose for a photograph next to a vintage car in Havana March 16, 2016. (Photo by Ueslei Marcelino/Reuters)

A three metre lego turbine is displayed at Customs House August 16, 2007 in Sydney, Australia. Engineers without Borders are constructing a 7,000 LEGO brick fully functioning three-metre tall wind turbine in Customs House Square as part of a three day technology extravaganza to highlight the organisation's work in developing countries. (Photo by Cameron Spencer/Getty Images)

Members of a teenage girl gang convincing an unwilling recruit to join the gang, circa 1955. (Photo by Vecchio/Three Lions)

A woman plays with her three dogs at the beach after sunset in Del Mar, California, USA on November 10, 2017. (Photo by Mike Blake/Reuters)

Three female friends dancing in nightclub. (Photo by Cultura Creative (RF)/Alamy Stock Photo )