German kickboxer Christine Theiss (L) hits challenger Olja Zerajic of Bosnia during their WKA middleweight title fight at Postpalast on March 2, 2012 in Munich, Germany. (Photo by Alexandra Beier/Bongarts/Getty Images)

“The Challenge!” Young boy relishes in a game of tug of war before school. Photo location: Lake Titicaca, Peru. (Photo and caption by Paul Heyman/National Geographic Photo Contest)

Hikaru Cho believes that we should challenge our imaginations to create new work using traditional tools, not fancy computers and software. (Photo by Jim Marks/PA Wire)

A Maori warrior prepares to challenge Prince Charles during his welcome to Takanhanga Marae in Kaikoura, New Zealand November 23, 2019. (Photo by Tracey Nearmy/Reuters)

Two demonstrators hurl stones at Soviet tanks on Leipziger Platz in East Berlin, Germany on June 17, 1953. Germany's parliament on Friday, June 16, 2023, commemorated the 70th anniversary of a popular uprising in the communist east that was brutally crushed by the Soviet-backed dictatorship.(Photo by AP Photo, File)

A visitor takes a picture of goldfish at the Art Aquarium exhibition in Tokyo Friday, August 12, 2016. The exhibition, featuring around 8,000 goldfish in tanks themed on Japan's Edo Period. (Photo by Koji Sasahara/AP Photo)

U.S. Army helicopters providing support for U.S. ground troops fly into a staging area fifty miles northeast of Saigon, Vietnam, August 28, 1966. Helicopter fuel is stored in the large rubber tanks, foreground. (Photo by Henri Huet/AP Photo)

Women wearing historical costumes walk past a tank before a rehearsal for the Victory Day parade, which marks the anniversary of the victory over Nazi Germany in World War Two, in Saint Petersburg, Russia on April 28, 2022. (Photo by Anton Vaganov/Reuters)