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In his first major policy speech, the defense secretary said the Pentagon is at war with itself: There are competing and spiraling costs within the military — for aging weapons, and for health and pension benefits for military personnel and retirees. He added that U.S. military power must be used judiciously, with a keen appreciation of its limits.

The draft proposal from the Environmental Protection Agency has sparked opposition from industry groups who say the changes would be prohibitively expensive.

Scientists are studying the way we show complex emotions. It turns out we're better at it than was previously thought, mixing and matching basic expressions with sophistication — and consistency.

Will Chicago Mayor Rahm Emanuel, a former top aide to President Obama, find himself facing a challenge from another politician who was once close to Obama?

Google is mining its search data from the World Cup games, trying to make factoids that go viral. Its "newsroom" is focused on happy thoughts, not sad ones — like Brazil's brutal defeat.

Many indigenous Guatemalan children entering the U.S. alone speak little or no Spanish. This language barrier contributes to the complexity of the unfolding humanitarian crisis at the border.

We looked at 15 top companies and services that handle your email or store your data every day to see what steps they take to keep it from prying eyes. See how they stack up.

The attorney general hugged community leaders, a highway patrol captain and the mother of Michael Brown during his visit, and got an update on the federal investigation into the teen's shooting.

A group representing some of the world's richest countries has created an interactive online tool that invites the public to rank 11 factors that contribute to happiness.

Controversial remarks about women not needing to ask for raises, how people in tech often limit their kids' screen time and a heated debate over smartphone encryption topped our tech coverage.