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The Pentagon says the U.S. dropped the largest conventional weapon ever used in combat to hit an underground ISIS complex. Some speculate the action was also meant to send a message to North Korea.

A mind-controlled robotic arm has pressure sensors in each fingertip that send signals directly to a paralyzed man's brain. It's still experimental, but could eventually help thousands, engineers say.

Mayorkas, who was born in Havana, came to the U.S. with his family as a political refugee. He was U.S. Citizenship and Immigration Services chief in the Obama administration.

A new study finds that too little sleep boosts a signal in the body that may drive a stronger desire to eat. It's the latest evidence linking sleep deprivation to overeating and increased body weight.

The secretary of state says the U.S. would be willing to engage North Korea "without preconditions." But he has signaled support for talks before, only to be publicly rebuked by the president.

A 73-year-old French woman in confinement in Chamonix recalls her Jewish father, who survived World War II hiding out in a nearby village. Others sent him smoke signals to warn when Nazis were near.

Another week of standoffs between the executive and legislative branches.

U.S. employers added 136,000 jobs in September — a sign of continued resilience in the labor market amid growing signals that the economy is losing steam. The jobless rate was the lowest since 1969.

The Tropical Atlantic Ocean has been quiet, and there are no signs of significant trouble anytime soon.Water temperatures might be favorable for tropical…

Thirst is what compels us to start hydrating. Now scientists have found a brain circuit in mice that seems to switch off thirst when they've taken in enough fluid and before it gets dangerous.