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  1. Certain memories may rest on a good sleep

    People who practice a task that demands quick visual processing perform it better on ensuing trials if they are first allowed to get some sleep.

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  2. Planetary Science

    An early cosmic wallop for life on Earth?

    New evidence from lunar meteorites suggests that debris bombarded the moon some 3.9 billion years ago, about the same time that life may have formed on Earth.

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  3. Math

    Prime proof zeros in on crucial numbers

    A new theorem may lead to a proof of Catalan's conjecture, a venerable problem in number theory concerning consecutive powers of whole numbers.

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  4. Animals

    First mammal joins the eusocial club

    Because naked mole rats exhibit permanent physical traits that distinguish certain castes of a colony, they belong to the same grouping as so-called eusocial insects such as bees, ants, wasps, and termites.