Cattle are the most important way of livelihood for the Karamojong: they provide milk, meat, blood and money when sold, Karamoja, Uganda, February 2017. (Photo by Sumy Sadurni/Barcroft Images)

Andrey Karr from Western Riders Slacklines at sunset above big waves in Nazare, Portugal on December 27, 2017. (Photo by Aidan Williams/National Geographic Travel Photographer of the Year Contest)

British actress and humanitarian Audrey Hepburn, 1955. Jumpology. (Photo by Philippe Halsman)

Henry Frayne of Australia shows his ability to triple jump the lenghth of more than two Formula 1 cars during a press conference at Albert Park on February 29, 2012 in Melbourne, Australia. (Photo by Robert Prezioso/Getty Images)

Singer Rihanna poses at amfAR's fifth annual Inspiration Gala in Los Angeles, California October 29, 2014. (Photo by Mario Anzuoni/Reuters)

Jeremy Scott's spring 2019 collection is modeled during Fashion Week in New York, Thursday, September 6, 2018. (Photo by Kevin Hagen/AP Photo)

A boy looks for scrap metal using an improvised magnetic tool near a construction site in New Delhi, India, March 21, 2016. (Photo by Cathal McNaughton/Reuters)

“If a man insisted always on being serious, and never allowed himself a bit of fun and relaxation, he would go mad or become unstable without knowing it”. – Herodotus. “You can discover more about a person in an hour of play than in a year of conversation”. – Plato. Photo: Mandalay, Burma. (Photo by Steve McCurry)