The Celtic knot — a pattern of interlocking lines — is centuries old, carved into ancient stones all over Ireland. But that tattoo on your biceps? Like the fortune cookie, American born and bred.

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Pablo Martinez Monsivais/AP

Digital learning initiatives are spreading to schools across the country, but new research raises doubts about how well they work.

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Raccoons, as cute as they are, carry parasites that can be dangerous to humans. Mixing medicine with yummy treats reduced the disease risk for animals and humans in parks in Chicago.

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Phil Klay served in Iraq from January 2007 to February 2008. He recently won a National Book Award for his collection of short stories.

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Justin Sullivan/Getty Images

The Centers for Disease Control and Prevention says only a third of Americans infected with HIV have the virus under control. Most have been diagnosed, though that's less common among the young.

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