White nationalists, neo-Nazis and members of the "alt-right" clash with counter-protesters as they enter Emancipation Park during the "Unite the Right" rally August 12, 2017 in Charlottesville, Virginia. Chip Somodevilla/Getty Images hide caption

Artists paint a mural on a wall near Scottish Events Centre (SEC) in Glasgow, which is hosting the U.N. climate summit that started on Sunday. Jeff J Mitchell/Getty Images hide caption

Yaël Eisenstat, pictured in September, says Facebook leaders have known about problems with disinformation and how Facebook incentivizes the most extreme voices. Riccardo Savi/Getty Images for Concordia Summit hide caption

New Mexico residents attend a candlelight vigil to honor cinematographer Halyna Hutchins in Albuquerque, N.M. Saturday, Oct. 23, 2021. Hutchins was fatally shot on Thursday on the set of a Western filmed in Santa Fe, N.M. Andres Leighton/AP hide caption

Children from Hong Kong sing at the Sutton Friendship Festival last month as the London borough welcomed new arrivals from the former British colony. Frank Langfitt/NPR hide caption

Voting rights activist Stacey Abrams speaks during an Oct. 17 rally in Norfolk supporting Terry McAuliffe in his bid to reclaim the Virginia governor's office. To drum up enthusiasm, Democrats have brought in some of their biggest names. Zach Gibson/Getty Images hide caption

At a meeting in Concord, New Hampshire, on Oct. 13, 2021, audience members voice opposition to federal vaccine mandates. Some employers, from state governments to hospitals to private companies, have already begun enforcing their own vaccine mandates, leading to the resignation or firing of a small percentage of workers. Holly Ramer/AP hide caption