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Studies show regular marijuana use by teens — once a week or more — affects areas dealing with memory and problem solving. That can hurt cognition and academic performance.

President Vladimir Putin's forces have effectively taken over the peninsula. Now, the world is watching anxiously to see if Russian troops move into other parts of Ukraine.

After drenching drought-stricken California, the weather system is affecting millions of people from Oklahoma to the Mid-Atlantic. It's another swipe from Old Man Winter.

The murder trial of the South African sprinter known as the "Blade Runner" has begun. He's accused of killing his girlfriend. Oscar Pistorius say she mistook her for an intruder.

What happens when some of Hollywood's biggest stars snap a group photo live on TV and then tweet it? Lots and lots of retweets, that's what. A record number, in fact.

The system aims to keep drivers from fumbling with their phones while they're behind the wheel, even as it brings them more options (and potential distractions).

Boy Scouts of America is "disappointed" by the decision. Disney says it doesn't support groups that aren't in line with the its policies. Gay boys may now be scouts. But gay adults may not be leaders.

Weather tales of the past remind us that others have had harsh winters, too.

Russian media say a stern message has been delivered: Ukraine must surrender Crimea, or a full-on military assault could begin Tuesday. Russia disputes that account.

The government is accusing Muslim separatists, known as Uighurs, for the knife attacks that killed 29 at a train station. But the government hasn't provided hard evidence so far.