Aspiring hemp growers are stuck in a tricky gray area these days. While voters in some states, like Colorado, have given the go-ahead to growing and processing the plant, a blanket ban still exists at the federal level. Not to mention the lack of rules for growing and processing hemp.

What happened over the weekend? At 8:34 on Friday night, Kanye West tweeted. He said he'd be premiering a song in a half hour and we'd have to do what he said to hear it – we'd have to go to a particular address and stand outside with other people and watch a video projected onto the side of a building. Of course, the first video of the video was up within minutes, so most people didn't have to do any such thing.

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.

Shanghai did something last fall that few other cities on the planet could have even considered. It opened two massive art museums right across the river from one another on the same day.

The grand openings put an exclamation point on China's staggering museum building boom. In recent years, about 100 museums have opened annually here, peaking at nearly 400 in 2011, according to the Chinese Society of Museums.

Hollywood superstar Angelina Jolie has been in the headlines, by her own choice for a change.

Genetic testing showed she was at high risk for breast cancer, so she decided to have a double mastectomy to improve her odds. She revealed her choice, and the thinking behind it, in a recent op-ed in The New York Times.