The amazing tale of two sisters from a poor neighborhood — who play tennis unlike anyone before them and each reach No. 1 in the world — is one we're not likely to see again.

Authorities are revisiting a triple murder in the Boston suburb of Waltham. One of the victims may have been a friend of bombing suspect Tamerlan Tsarnaev. Tsarnaev would sometimes spar at the same mixed martial arts gym where the victim worked as an instructor.

The Ruth Ellis Center in Highland Park, Mich., is making an effort to meet its clients where they are — on the dance floor, specifically with the dance form known as "vogue." From there, the center can connect them with counseling, health services, tutoring and clean clothes.

President Obama's commencement speeches often seem more about the big-picture state of the union than do his State of the Union addresses, which read like to-do lists. And his assessment of where the country stands and where it's going has changed over the past four years.

Playing the famous half-Vulcan requires a little meditative depth and a lot of brow-shaving. Heroes villain Zachary Quinto plays Spock in the reboot of the Star Trek franchise, with the blessing of original Spock Leonard Nimoy. Quinto tells NPR about befriending Nimoy, shaping eyebrows and more.

On Spirityouall, McFerrin performs classic black spirituals with roots in enslaved communities, as well as songs he composed himself. Throughout the album, he says, he hears the influence of his father, Robert McFerrin Sr., a renowned operatic baritone.

Proposals for chemical plants to use "inherently safer" design practices have been blocked by industry executives and their allies in Congress, despite deadly accidents and the risk of a potential terrorist attack that could harm an entire community or city.

Audie Cornish speaks with political commentators E.J. Dionne of The Washington Post and Brookings Institution and David Brooks of The New York Times. They discuss controversial IRS audits, the release of White House emails on Benghazi talking points and the Justice Department's seizure of AP phone logs.

As America's Cup officials investigate the tragic drowning of Olympian Andrew Simpson last week in San Francisco, some in the sailing community are questioning the safety of the ultra-fast high tech catamarans featured in the upcoming race.

A new study confirms that the vast majority of scientists who research the climate accept that the planet is warming and human beings are largely responsible. Yet a large slice of the American public believes that scientists are deeply split about global warming.