First graders of a cadet's lyceum attend a ceremony to mark the start of the new school year in Kiev, Ukraine, September 1, 2015. September 1 marks the start of a new academic year for students in Ukraine.(Photo by Valentyn Ogirenko/Reuters)

Police officers display their AI-powered smart glasses in Luoyang, Henan province, China on April 4, 2018. (Photo by Reuters/China Stringer Network)

Children play on a flooded highway during a summer downpour in Edsa, Quezon city, metro Manila, Philippines on April 25, 2018. (Photo by Dondi Tawatao/Reuters)

Video bloggers stream live broadcast of an event to celebrate the fourth birthday of the world's only giant panda triplets, Meng Meng, Shuai Shuai and Ku Ku, at Chimelong Safari Park in Guangzhou, China July 29, 2018. (Photo by Bobby Yip/Reuters)

Municipal workers try to retrieve the lid of a manhole to prevent pedestrians from falling in, in Mumbai, India, Wednesday, September 20, 2017. Incessant rainfall in India's commercial capital has affected air and rail traffic, and schools and colleges remained shut for the day. (Photo by Rafiq Maqbool/AP Photo)

A jaguar ambushes a giant jacare caiman high up on the Three Brothers River in the Pantanal in Mato Grosso, Brazil. The cat wrestled with the reptile for over twenty minutes in a death struggle witnessed by photographer Chris Brunskill just after ten o'clock in the morning on the 26th of September, 2017. Caimans form a large part of the jaguar's diet in the Pantanal but battles such as this are very rarely observed and seldom photographed. (Photo by Chris Brunskill Ltd/Getty Images)

Kyrgyz Communist supporters gather in front of the Soviet Union founder Vladimir Lenin monument in Bishkek on November 7, 2017, to celebrate the 100th anniversary of The Bolshevik Revolution. (Photo by Vyacheslav Oseledko/AFP Photo)

Filipino villagers escape to a safe area as the Mayon Volcano erupts anew in the town of Daraga, Albay province, Philippines, 23 January 2018. The Philippine Institute of Volcanology and Seismology (PHIVOLCS) agency on 22 January raised the alert level for the Mayon Volcano amid fears of a bigger eruption over the next few hours or days. (Photo by Francis R. Malasig/EPA/EFE)