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"Does the president have the authority to use a weaponized drone to kill an American not engaged in combat on American soil?" the attorney general asks. "The answer to that question is no."

Kentucky Sen. Rand Paul (R-KY) held the Senate floor for more than 12 hours on Wednesday in protest of the White House drone policy. His action delayed the vote on the confirmation of John Brennan as CIA director. NPR's Ken Rudin discusses the use of the filibuster throughout history.

For more than a century, neurons have been the superstars of the brain. Now researchers say that when they placed human versions of another type of brain cell into mice brains, the mice grew up to be faster learners. This supports the hypothesis that these glial cells — and not just better-known neurons — play an important role in learning.

Feeding on flowers with caffeinated nectars gives bees a memory boost, new research shows. Turns out, other studies have found humans can get a similar boost in short-term memory with caffeine — if they're exhausted.

Syrian rebels have captured a provincial capital, Raqqa, in the north of the country. The Syrian government has responded with airstrikes, which has set off an exodus of refugees heading to the Turkish border.

The Senate easily confirmed the nomination of John Brennan as CIA director, that following the dramatics of Sen. Rand Paul, who filibustered against it for nearly 13 hours on Wednesday night. Is this the dawn of a new era of these, old-school, "talking" filibusters? Tamara Keith talks to Audie Cornish.

The chairman of the Armed Services Committee said the best thing for the country would be for him to serve the next two years without the distraction of a campaign.

Organizing for Action, which was formed from the Obama for America campaign committee to promote the president's second-term agenda, now says it won't take money from corporations or PACS. Critics say they'll believe it when they see it.

When he was arrested for driving under the influence of alcohol and other charges in 2005, Stephen Slevin had no way of knowing that initial findings about his mental state would put him on a path to spend more than 22 months of solitary confinement in a New Mexico county jail, despite never having his day in court.

By some accounts, sticky fingers could be costing the school $250,000 a year. The dining halls at the school have just started stocking the chocolate and hazelnut spread.