An injured demonstrator receives aid during a protest against a lockdown planned for the capital this weekend to halt the spread of the coronavirus disease (COVID-19) in Belgrade, Serbia on July 7, 2020. (Photo by Marko Djurica/Reuters)

Children in a Hong Kong refugee resettlement area watch as former Vice President Richard Nixon shows them his badminton service. Nixon visited Hong Kong, April 4, 1964, during his tour of countries in the Far East. (Photo by AP Photo)

The secretive indri (Indri indri) of Madagascar, the largest living lemur. It is also critically endangered and highly evolutionarily distinct with no close relatives, which makes its branch one of most precarious on the mammal evolutionary tree. In the likely event that the indri goes extinct, we will lose 19m years of unique evolutionary history from the mammal tree of life. (Photo by Pierre-Yves Babelon/Aarhus University)

People stand in front of an murals at Lodhi Art District in New Delhi on March 24, 2019. Visitors throng Lodhi colony which has murals by dozens of Indian and international artists. (Photo by Sajjad Hussain/AFP Photo)

Shaymaa Ismaa’eel, a 24-year-old Muslim woman passes by a group of angry protesters at an Islamic conference in Washington, DC on April 21, 2019. In response, she crouched in front of them and flashed a peace sign. The photo, posted on Instagram, prompted an outpouring of support. (Photo by Shaymaa Ismaa'eel/Instagram)

Ariana Lamcellari, 4, holds a sign at a protest against violence, following the charge of a British police officer in the London kidnapping and murder of Sarah Everard, in Dublin, Ireland on March 16, 2021. (Photo by Clodagh Kilcoyne/Reuters)

United States Air Force Academy graduates cheer as the United States Air Force Thunderbirds fly over the graduation for the Class of 2021 at Falcon Stadium on May 26, 2021 in Colorado Springs, Colorado. Chairman of the Joint Chiefs of Staff General Mark A. Milley gave the commencement address to the 1,019 graduates from the academy. (Photo by Michael Ciaglo/Getty Images)

Wildlife officials carry away the carcass of a turtle that was washed ashore at the beach of Angulana, south of Sri Lanka's capital Colombo on June 24, 2021. (Photo by Ishara S. Kodikara/AFP Photo)