Russian President Vladimir Putin, right, and North Korea's leader Kim Jong Un pose for photographers during their meeting in Vladivostok, Russia, Thursday, April 25, 2019. Putin and Kim are set to have one-on-one meeting at the Far Eastern State University on the Russky Island across a bridge from Vladivostok. The meeting will be followed by broader talks involving officials from both sides. (Photo by Alexander Zemlianichenko/AP Photo/Pool)

Maggie Estby, of Champlin, Minn., high-fives her bulldog Bam Bam after the pooch was crowned the winner of the annual Drake Relays Beautiful Bulldog Contest, Monday, April 25, 2022, in Des Moines, Iowa. The pageant kicks off the Drake Relays festivities at Drake University where a bulldog is the mascot. (Photo by Charlie Neibergall/AP Photo)

Members of the Sydney Swans Football Club and LA Rams cheerleaders walk in the Sydney Gay & Lesbian Mardi Gras Parade as part of Sydney WorldPride on February 25, 2023 in Sydney, Australia. The Sydney Gay and Lesbian Mardi Gras parade returns to Oxford Street in celebration of the event's 45th anniversary. The parade began in 1978 as a march to commemorate the 1969 Stonewall Riots in New York and has been held every year since to promote awareness of gay, lesbian, bisexual and transgendered issues. (Photo by Brendon Thorne/Getty Images)

The competition, which is run by the Royal Observatory Greenwich in association with BBC Sky at Night Magazine, is now in its sixth year and has received over 2,500 entries. Photo: Centre of the Heart Nebula by Ivan Eder (Hungary). Situated 7500 light years away in the “W”-shaped constellation of Cassiopeia, the Heart Nebula is a vast region of glowing gas, energized by a cluster of young stars at its centre. The image depicts the central region, where dust clouds are being eroded and moulded into rugged shapes by the searing cosmic radiation. (Photo by Ivan Eder)

Amundsen-Scott South Pole Station experiences months of darkness. The sun dips below the horizon on March 21, after which follows several weeks of twilight before complete darkness results. Photo taken on June 25, 2009. (National Science Foundation/Jeremy Johnson)

Queen of drums, Sabrina Sato of Unidos de Vila Isabel samba school during the Champions Parade on the last day of Rio de Janeiro 2022 Carnival at Marques de Sapucai Sambadrome on May 01, 2022 in Rio de Janeiro, Brazil. Rio de Janeiro's iconic carnival returns to the sambodrome after a two year suspension and postponements due to the coronavirus pandemic. (Photo by Wagner Meier/Getty Images)

Skiers and snowboarders in swimwear during the Grelka Fest-2019 Festival at the Sheregesh ski resort, Kemerovo Region, Russia on April 13, 2019. (Photo by Kirill Kukhmar/TASS)

The Invasion. A quiet street in Macau. Modernization around is quickly changing the city, as documented by Paul Tsui. (Photo by Paul Tsui/National Geographic Travel Photographer of the Year Contest)