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Roughly 2.5 million Americans are addicted to heroin and opioids like Oxycontin. Researchers say addiction takes over the brain's limbic reward system, impairing decision making, judgment and memory.

Patrisse Khan-Cullors' new memoir recalls the female origins of the movement and the "deep contradiction" of being labeled the enemy.

Snipers. Specially trained dogs. Multiple layers of security screening. Detectives in hotels. After recent attacks, New York and Las Vegas are seeing beefed up security this year.

The idea of using leeches to treat ailments is ancient — and no longer in favor. But now these blood-suckers are gaining new respect as a doctor's helper during surgery.

About a month ago, the Brazilian government said miners would get access to an expanse of rain forest larger than Denmark. After public resistance and a legal setback, it reversed course Monday.

Researchers have developed a new wheat-like species called Salish Blue that grows back year after year, which not only cuts down on work for farmers, but helps prevent erosion and agricultural waste.

NBC fired Matt Lauer as Variety was preparing a story in which several women detailed their allegations against the powerful TV host.

Jake Heggie's new work explores what goes into producing an opera, poking fun at the genre with a wink at technical challenges and backstage melodrama.

NBC News fired longtime "Today" show host Matt Lauer on Wednesday for "inappropriate sexual behavior," making him the second morning television show personality to lose his job because of sexual misconduct charges in a week.

The fight pitted those who think the terminally ill should have the choice to end their lives with medication against those who worry people might be pressured into suicide.