Samantha Kerr prepares coffee at Artifact Coffee in Baltimore, MD. Maggie Starbard/NPR hide caption

itoggle caption Maggie Starbard/NPR

Watch as global population explodes from 300 million to 7 billion.

Adam Cole, Maggie Starbard/NPR hide caption

itoggle caption Adam Cole, Maggie Starbard/NPR

Spooked by a noise, giraffes in northwest Namibia interrupt lunch to look around. John W. Poole/NPR hide caption

itoggle caption John W. Poole/NPR

A painter touches up one of the bridge's cables. When it came time to decide the paint color for the bridge, consulting architect Irving Morrow wanted a warm hue to contrast with the cool grays, blues and greens of San Francisco Bay. Courtesy of goldengatebridge.org hide caption

itoggle caption Courtesy of goldengatebridge.org

At a party outside Brisbane, Australia, nursing students sing i-Kiribati songs. Brian Reed for NPR hide caption

itoggle caption Brian Reed for NPR

There are no proper roads in Cabaret, just tracks worn in the dirt and paths that wind amid haphazardly fenced plots. David Gilkey/NPR hide caption

itoggle caption David Gilkey/NPR