In this September 4, 1963, file photo, a police officer carries off a demonstrator holding a Confederate flag after a group of demonstrators protested enrollment of two African-Americans at Ramsay High School in Birmingham, Ala. The Confederate battle flag has been removed from South Carolina's Statehouse grounds, in the wake of the massacre of nine African-Americans, including a state senator, at an historic black church in Charleston in June 2015. (Photo by AP Photo)

A demonstrator attends a protest against fare hikes for city buses in Rio de Janeiro January 16, 2015. Amid a marked economic downturn and high inflation, bus fares went up in Sao Paulo, Brazil's largest city, from 3 to 3.50 reais, and in Rio, the former capital, from 3.0 to 3.40 reais. (Photo by Mauro Pimentel/Reuters)

An Afghan woman fills containers with water near her temporary shelter at an internally displaced person's (IDP) camp on the outskirts of Herat, Afghanistan, January 21, 2015. Dozens of families are living in temporary shelters even in harsh winters and most depend on aid distributions by the United Nations High Commissioner for Refugees (UNHCR). (Photo by Jalil Rezayee/EPA)

A police officer speaks to a driver shortly after midnight in Bucharest, Romania, Monday, November 9, 2020 informing him of the pandemic related night traffic restrictions that just came into effect. Romania introduces new restrictions aimed at limiting the spread of the COVID-19 infections following a week when it registered an all time high number of new infections. (Photo by Vadim Ghirda/AP Photo)

An anti-lockdown activist dressed as Father Christmas is arrested in Grosvenor Square during a demonstration in London, England, on November 28, 2020. London is to return to “Tier 2” or “high alert” covid-19 restrictions once the current England-wide coronavirus lockdown ends next Wednesday. All three of the tiers, assigned to local authorities across England, have been strengthened since the lockdown began on November 5, however, with the main impacts to be felt by the hospitality sector. (Photo by Mark Thomas/i-Images)

Indonesia's Mount Sinabung erupts, sending a column of volcanic materials as high as 16,000 feet into the sky on August 10, 2020. The volcano, one of two currently erupting in Indonesia, was dormant for four centuries before exploding in 2010, killing two people. Another eruption in 2014 killed 16 people, while seven died in a 2016 eruption. (Photo by Sutanta Aditya/Abaca/Sipa USA via AP Images)

Spot, a robot with dog-like movements, walks past a dog in Cathedral Square in Erfurt, Germany on April 20, 2021. Security service provider Ciborius, a provider of robotic security solutions with artificial intelligence, presented its artificial employee with high-resolution 360-degree all-round camera, ultra-bright LED light and a light detection system on Domplatz. (Photo by Michael Reichel/dpa)

Rare images of wild tigers in Bhutan, captured by camera traps, show tigers and other animals using high-altitude wildlife corridors which are lifelines to isolated tiger populations and critical to genetic diversity, conservation and growth. Here: A wild Bengal tiger (Panthera tigris tigris) captured on a camera trap in corridor eight at an altitude of 3,540 metres in Trongsa, Bhutan. (Photo by Emmanuel Rondeau/WWF UK/The Guardian)