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.
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
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