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  1. College may endow memory to old brains

    College-educated older adults recruit new brain areas to counteract some of the memory loss that occurs with aging, a new brain-imaging study suggests.

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  2. Health & Medicine

    New protease inhibitor looks promising

    An antiretroviral drug under development may work in patients for whom existing drugs fall short.

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  3. Astronomy

    Too Darn Hot

    A new theory of planet formation suggests that sizzling-hot Earths may be abundant throughout the galaxy and could soon be detected.

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  4. 19531

    Regarding this article, might I suggest that, rather than being a tool of thinking, imagination is just another word for thinking? Greg OttingerSunnyside, Calif.