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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.

Ski mountaineering will make its Olympic debut this year, the first winter sport to do so since 2002. Skeleton, luge, ski jumping and moguls are also getting new events.

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

Kid, meaning a young goat, is a word that was borrowed from the Vikings around the 9th century. Centuries later, it came to mean a child and a teasing joke.

Homeless women face unique health challenges with few dedicated resources. And as the number of women experiencing homelessness in Los Angeles continues to grow, Dr. Mary Marfisee hopes to bring them lifesaving resources.