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Ships and search planes are being sent to investigate a pulse signal that a Chinese patrol ship picked up twice this weekend, says the head of the search effort for a Malaysia Airlines jet.

Matthiessen was a spy, a naturalist, a well-regarded activist and a three-time winner of the National Book Award — for both fiction and nonfiction. He died of acute myeloid leukemia.

Anja Niedringhaus was killed last week in an attack by an Afghan police commander. She was in Khost province covering the run-up to Saturday's presidential election.

The Wildlife Service mission is to mitigate conflict between humans and wildlife. But critics, including members of Congress, say the agency uses cruel methods and is not transparent enough.

Several scientific teams are developing sensitive tests for tumor DNA that, when perfected, could be used to diagnose cancer earlier, and more closely monitor the response to treatment.

The undefeated Connecticut and Notre Dame could meet in a record-setting final Tuesday, if they can get past Stanford and Maryland, respectively, today. All four programs have won past titles.

Seeking to advance the cause of equal pay for women, President Obama plans to sign am executive order Tuesday barring federal contractors from retaliating against employees who compare salaries.

Attendees at the annual We Robot conference are peering into the future, pondering questions like, do robots have rights? What kinds of laws do we need to regulate unmanned drones?

A key moment in the butchery occurred at the Ecole Technique Officielle. Thousands of Tutsis sheltering there were left to fight for survival after the school was abandoned by Belgian peacekeepers.

It's easy to think that a shaking hand could be a sign of Parkinson's disease. But it's more likely essential tremor, an ailment that's not life-threatening but can become debilitating.