A boy jumps into a pool of mud during the traditional “Bloco da Lama” or “Mud Street” carnival party, in Paraty, Brazil, Saturday, February 25, 2017. Legend has it the “bloco” was born in 1986 after local teens hiking in a nearby mangrove forest smeared themselves with mud to discourage mosquitoes and then wandered through Paraty. The party grew year after year, but revelers eventually were banned from parading in the colonial downtown after shopkeepers complained pristine white walls were stained with the hard-to-remove mud. (Photo by Mauro Pimentel/AP Photo)

A girl salutes to visitors before a show at the Mangyongdae Children's Palace in central Pyongyang, North Korea May 5, 2016. Pyongyang held a gala of song and dance performances by local school children on May 5 for visiting delegations of foreign journalists and tourists at the Mangyongdae Children's Palace. The event included orchestral, choir, and acrobatic performances, many of them with political undertones. The Seventh Worker's Party Congress commences on May 6, 2016. (Photo by Damir Sagolj/Reuters)

Valery Bystritskii, 10, gets a fellow student into a lock at Bunny's Gym in July 2015 in Winchester, Tennessee. (Photo by Mike Saliba/Barcroft USA)

In this photo taken on Friday, July 14, 2017, a student at a paramilitary camp for children calls the rank to attention outside Kiev, Ukraine. As the deadly conflict in eastern Ukraine entered its third year, some parents in Ukraine are anxious to make sure their children are ready to fight it, instead of swimming and playing volleyball. (Photo by Efrem Lukatsky/AP Photo)

Five-year-old Jeda takes a close look at “Sharnana” by artist Drew McDonald at the Sculpture by The Sea on October 18, 2024 in Sydney, Australia. (Photo by Jessica Hromas/The Guardian)

Children playing on Walled City rooftop in Hong Kong, 1989. The lack of formal governance in the Walled City led to challenges, but it also fostered a unique system of informal social order. (Photo by Greg Girard/The Guardian)

Everly Base, six, sees the funny side of a TV carol-singing performance with her classmates in which her father had dared her to cross her eyes while she sang in Yate, Gloucestershire, UK on December 19, 2024. (Photo by Tom Wren/South West News Service)

Young Muslim worshippers stand in the rain at the shrine of the 12th-century Sunni cleric Abdul Qadir al-Jilani (Gilani) in Baghdad as people gather to perform the prayers for Eid al-Fitr, which marks the end of the Muslim holy fasting month of Ramadan, as observed locally on March 31, 2025. (Photo by Ahmad Al-Rubaye/AFP Photo)