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This is Scientific American's 60-Second Science. I'm Karen Hopkin. This'll just take a minute.

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A book a day may keep dementia away.

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Even if you read it as a kid.

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Because a study finds that exercising the brain, at any age, may preserve memory.

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The work appears online in the journal Neurology.

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Previous studies have shown that engaging in brain-building activities is associated with a delay in late-life cognitive decline.

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But why?

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Does flexing the old gray matter somehow buffer against age-related intellectual impairment?

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Or is cognitive loss simply a consequence of the aging brain's physical decline?

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To find out, researchers questioned nearly 300 elderly individuals about their lifelong participation in intellectual pursuits,

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like reading books, writing letters and looking things up in the library.

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Then, every year, for an average of six years until they died, the subjects took tests to measure their memory and thinking.

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What the researchers found is that folks who worked their mental muscles, both early and late in life, remained more intellectually limber than those who didn't,

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even when a post-mortem look at their brains revealed the telltale signs of physical decline.

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So if you're headed to the beach, don't forget a hat and a book, both to protect your head.

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Thanks for the minute, for Scientific American's 60-Second Science. I'm Karen Hopkin.

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