The Diamond Diverges: Cars swap sides of the road at the end of a bridge in Springfield, Mo. Missy Shelton for NPR hide caption

itoggle caption Missy Shelton for NPR

Regina Holliday prepares her supplies for a day of painting. Maggie Starbard/NPR hide caption

itoggle caption Maggie Starbard/NPR

Marine scientist Walter Boynton of the University of Maryland Center for Environmental Science is studying mud, ooze, and other material from the Chesapeake Bay's bottom to find out what areas are healthy and where it's dying. John Poole/NPR hide caption

itoggle caption John Poole/NPR