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Physicists using data from an Antarctica telescope say they've observed evidence of primordial gravity waves — in other words, echoes of the Big Bang. If real, this may be a big advance for physics.

Brig. Gen. Jeffrey Sinclair, who was accused of sexually assaulting a subordinate, has pleaded guilty to lesser charges in a deal with the government.

Following Sunday's referendum in Crimea, Robert Siegel speaks with the U.S. ambassador to Ukraine, Geoffrey Pyatt, to find out his reaction to the vote in favor of secession.

A year after the release of a Republican Party report on what went wrong in 2012, party leaders say they have better data collection and outreach. Immigration reform, however, remains a thorny issue.

Khalid Sheikh Mohammed, self-described mastermind of the 2001 attacks, submitted a statement on behalf of Sulaiman Abu Ghaith, who is on trial in Manhattan.

Western lawmakers and Interior Secretary Sally Jewell urge changes to the way America pays to fight wildfires, starting with preserving money that's meant for fire prevention.

An Egyptian criminal court on Monday sentenced them to death over the killing of a police officer. Human rights groups say the unprecedented verdict followed a sham trial that wrapped up in 2 days.

Gale-force winds temporarily halted efforts to find the Malaysia Airlines jet as China demanded access to satellite data used to determine that the plane crashed off the Australian coast.

LINCOLN, Neb. (AP) — A bill designed to prevent Nebraska county supervisors from making decisions behind closed doors has won first-round approval in the…

Thompson has been named acting head of the Office of Legal Counsel, which approves executive branch legal arguments on armed drones, surveillance and other national security issues.