Jeff Melton (left) and Adrian Rohr, friends and pro wrestling super fans, greet each other with "too sweet," a gesture known to pro wrestling fans as a way of saying hello or acknowledging something positive. Photo illustration by Claire Harbage/NPR and Paige Vickers for NPR hide caption
American University researchers (front to back) Marek Cabrera, Dan Perry and Scotty Summers excavate an area in Delta, Pa., where migrant workers camped during the Depression. In the area in this photo, taken in 2016, researchers found evidence of a shelter, a slate mandolin pick and fragments from a ceramic bowl, plate and cup. Courtesy of Justin Uehlein hide caption
A DIYgirls team from San Fernando Senior High School created a device that uses solar power to sanitize a tent using antibacterial UV lights. Courtesy of DIYGirls hide caption