Haley Williams, left, and Amiya Cox participate in a Global Climate Strike at the Experiential School of Greensboro in Greensboro, N.C., in September 2019.
Trainer Collette Yee walks with Rizzo, a medical detection dog, as she sniffs senior Madison Schoening at Mills High School in Millbrae, Calif., in early May. As part of a pilot program, some students volunteered to be sniffed for COVID by trained dogs before attending the prom.
Two Texas Troopers light a candle at Robb Elementary School in Uvalde, Texas, a day after 19 children and two teachers were killed by a gunman in their school.
Signs, balloons, and police tape are wrapped around a pole across from Tops Friendly Market, the Buffalo, N.Y., grocery store that was the site of a racist shooting rampage on May 14.
The archbishop of San Antonio, Gustavo Garcia-Siller, comforts families following a deadly school shooting at Robb Elementary School in Uvalde, Texas, on Tuesday, May 24, 2022.