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Scientists have found some human DNA that, when added to mice, makes their brains bigger. But as DNA research into human brains goes forward, are there ethical lines we shouldn't cross?

A defense official tells NPR that the rebels will be vetted and screened under top-secret protocols. Qatar, Jordan and Saudi Arabia will also be part of the effort.

British Typhoon warplanes were scrambled after Russian military aircraft skirted England. The incident comes after the U.K. criticized Russia for its actions in Ukraine.

The Food and Drug Administration has approved a drug that thwarts some enzymes breast cancer cells use to evade treatment with estrogen-blocking drugs.

Prince Turki al-Faisal, the ex-Saudi intelligence chief, says the "pinprick" attacks against the Islamic State are not proving effective. He also says the campaign needs to be better coordinated.

Sharpen your Swiss Army knives and grab an extra roll of duct tape, because Mac may be coming back. The creators are looking to the fans to design the new show. And there's one big twist.

The planes used to spray Agent Orange in Vietnam weren't retired from service — they were used by reservists in the U.S. for more than a decade after the war, exposing the crews to harmful chemicals.

NPR's Steve Inskeep profiles three Iranians who discuss their dreams — and hopes that have been dashed previously.

Investigators say the turboprop plane's right engine lost thrust 37 seconds into the flight, and that the left one failed to restart not long afterwards.

A televised statement said the group was forming a presidential council that would run the country. It called the takeover "a new era that will take Yemen to safe shores."