Sen. Joe Manchin, a West Virginia Democrat, has an "A" rating from the NRA, but questions why anyone would need the kind of semi-automatic assault rifle used in the Newtown, Conn., killings. Dave Martin/AP hide caption

The contents of a box of some of the new foods containing caffeine collected by the Center for Science in the Public Interest. Karen Castillo Farfán/NPR hide caption

Maria Lola Melisio, 18, entered the U.S. illegally with her mother when she was 7. Now she's an undocumented resident living in Alabama, which has one of the country's toughest immigration laws. Debbie Elliott/NPR hide caption

The GRAIL mission's gravity map of the moon. Very precise measurements between two lunar probes orbiting the moon allowed researchers to study the moon with great detail. NASA/JPL/Caltech hide caption

Andras Gyorfi's winning entry in The Seasteading Institute's 2009 design contest. The institute supports the idea of permanent, autonomous offshore communities, but it does not intend to construct its own seasteads. Courtesy of The Seasteading Institute hide caption