NPR News

The idea of vertical farming is all the rage right now. Architects and engineers have come up with spectacular concepts for lofty buildings that could function as urban food centers of the future.

A federal appeals court ruled Tuesday in favor of the government's decision to keep photos and video of the May 2011 raid that killed Osama bin Laden a secret, rebuffing a conservative watchdog group that had sought their release.

A three-judge panel of the U.S. Court of Appeals in Washington accepted a White House assertion that releasing the images, including death photos of bin Laden, could spark violence and risk the lives of Americans abroad.

A federal court in Guatemala has thrown out the genocide conviction of former dictator Efrain Rios Montt, which had been called a breakthrough in the region's human rights.

NPR's Carrie Kahn reports that "all trial evidence and testimony as of April 19th, the date a trial judge was removed from the case, must be re-entered."

Even as President Obama was declaring that tornado-devastated Oklahoma would get "everything it needs right away," the state's most vociferous critic of federal emergency aid vowed that he, too, would push for assistance "without delay."

A rare piece of America's military history was located this spring, when dolphins from the Navy's Marine Mammal Program located an unusual artifact: a torpedo from the 19th century. Discovered during a training exercise in the ocean near San Diego, the torpedo will eventually make its way to a museum.

The bottlenose dolphins were honing their ability to find underwater mines when the discovery was made. The torpedo did not have a warhead, Navy officials say.