There are variations in the appearance of severely bleached corals. Here, the coral displays pink fluorescing tissue signalling heat stress. ARC Centre of Excellence for Coral Reef Studies/ Gergely Torda hide caption

Protester Jack Willis, 26, demonstrates outside a Starbucks in Philadelphia. Police arrested two black men who were waiting inside a Center City Starbucks which prompted an apology from the company's CEO. Mark Makela/Getty Images hide caption

Novelist Richard Powers moved to Tennessee after first visiting the Smoky Mountains — shown above, at sunset — for research. NPS hide caption

Cans are lined up at the Pacific Coast Producers plant in Oroville, Calif. The company, which cans fruits for sale in supermarkets, says new tariffs imposed by the Trump administration on steel imports will eat into its profits. Rick King Design hide caption

Outgoing European human rights Commissioner Nils Muiznieks (L) shares a joke with the Dalai Lama at the Council of Europe in Strasbourg, France, in 2016. Frederick Florin/AFP/Getty Images hide caption

Ogechi Ukachu, one of the registered nurses recently hired to help staff D.C.'s "Right Care Right Now" program, takes a training call at the city's 911 call center. Selena Simmons-Duffin/NPR hide caption

A daily edition of The Columbian passes overhead at the paper's printing press in Vancouver, Wash. Natalie Behring/Getty Images hide caption

Asylum-seeker Allan Monga, 19, won Maine's Poetry Out Loud competition in March. But he's been barred from the national competition because he's not a citizen or permanent resident. Courtesy of the Maine Arts Commission hide caption

Bernie Dalton (right) and Essence Goldman (center) signing copies of Bernie And The Believer's album Connection Courtesy of Essence Goldman hide caption