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Russia is stepping up covert attacks across Europe — rail sabotage, drones, cyberstrikes — testing NATO. Polish officials warn "disposable agents" are sowing fear and weakening support for Ukraine.

Parkinson's disease appears to disrupt a brain network involved in everything from movement to memory.

Experts warn that the expiration of a long-standing nuclear arms control treaty between the two superpowers could mark the start of a new nuclear rivalry.

Focusing on political victories during his State of the Union address, Trump gave himself and Republicans high marks while scolding Democrats for their stances on the economy and immigration.

The newly elected governor of Virginia focused the Democratic response around affordability, a central issue to her party's campaign to win back the House this fall.

China on Tuesday restricted exports to 40 Japanese entities it says are contributing to Japan's "remilitarization," in the latest escalation of tensions with Tokyo.

Under Trump administration deals to lower drug prices, pharmaceutical companies are offering some of their drugs at discounted prices through a new website called TrumpRx.gov.

Allegations of cheating and swearing on the curling ice have rocked the sport after the Swedes accused the Canadians of "double touching" in a match. What happened then, and what's happened since?

The case is seen as a test of social media's legal responsibility for platform design features that plaintiffs' lawyers say exacerbated mental health issues in young people.

The NHL stars Matthew and Brady Tkachuk are elite at getting under their opponents' skin. But at the Olympics, where they are crucial to Team USA's hockey hopes, fans are pressing pause on the hate.