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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.

Prolific French film-maker Alain Resnais died over the weekend at the age of 91. Resnais' films captured international awards over seven decades. And, he was making movies up until the very end.

Honey Dew Donuts has been cleared to open one of its stores at the YMCA in Quincy, Mass. Just one restriction: no donuts. Salads, fruit cups, sandwiches and smoothies are allowed.

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.

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.

The Conservative Political Action Conference, an annual gathering of conservative activists, routinely attracts big names in the Republican party — and this year's no different. It starts Thursday.

President Obama held a Spanish-language town hall-style meeting on the law. Latino enrollment in the health insurance exchanges is seen as critical to its success, but there's been a rocky start.

An astrophysicist is using something called the Z machine at Sandia National Lab to recreate the conditions on a white dwarf star — only for a few nanoseconds, but still, enough to study.

World War I began 100 years ago this summer. The spark — Archduke Franz Ferdinand's assassination — was dramatic, tragic and, in some ways, almost comic.