Martha (right), an extinct passenger pigeon, at the Smithsonian's Natural history Museum in Washington. The passenger pigeon was once the world's most plentiful bird. Sept. 1 is the centenary of the bird's extinction.
Lindolfo Carballo, an immigrant from El Salvador, meets his son Raynel outside school. In El Salvador, he says, families often "teach their boys one thing and their girls differently." He's trying to set a different example for his children.
Sarah Tilotta for NPR
The Ricketts family poses on the Chicago Cubs field in 2010, a year after they bought the team. From left, Laura Ricketts, Joe Ricketts, Marlene Ricketts, Todd Ricketts, Tom Ricketts and Pete Ricketts.
Nam Y. Huh/AP
Third-year medical student Allie Tetreault, left, talks with Gabrielle Nuki, 16, at Maine Medical Center in Portland, Maine. Gabrielle helps med students practice patient care.
Tony Stewart, driver of the #14 Bass Pro Shops / Mobil 1 Chevrolet, hits the wall on the backstretch during the NASCAR Sprint Cup Series Oral-B USA 500 at Atlanta Motor Speedway on Sunday in Hampton, Ga.
Jamie Squire/Getty Images
Long time employees Denise Miller, facing camera, and Gloria Panameno hug as they leave the Showboat Casino Hotel on Sunday. Owner Caesars Entertainment closed the still-profitable Showboat to reduce the number of casinos in Atlantic City, which has been struggling with plunging revenue.