Ken Caldeira of the Carnegie Institution for Science takes a water sample during his experiment on part of the Great Barrier Reef. The water is slightly pink because his team is using a dye to trace an acid-neutralizing chemical as it flows across the reef. Richard Harris/NPR hide caption

A sign on I-93 alerts motorists that Boston is under a "shelter in place" order Friday. Elise Amendola/AP hide caption

A portrait is projected on the walls of a building as part of a project promoting art through re-evaluating urban spaces and buildings in Sao Paulo, Brazil, on Nov. 22. Yasuyoshi Chiba/AFP/Getty Images hide caption

People line up to enter the Supreme Court on Monday for arguments. Mark Wilson/Getty Images hide caption

First-time homeowner Amanda Cowley in her new home in the Bloomingdale neighborhood of Washington, D.C. After married couples, single women are the largest demographic group of homebuyers. Gabriella Demczuk/NPR hide caption

Dawes' new album is titled Stories Don't End. Courtesy of the artist hide caption

Robert Redford directs and stars as Jim Grant in The Company You Keep, a film about retired radicals living out nervous lives in hiding. Doane Gregory/Sony Pictures Classics hide caption