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  1. ADHD kids show slower brain growth

    A new brain-scan investigation indicates that attention-deficit hyperactivity disorder involves substantial delays in children's brain development.

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  2. Anthropology

    Ancient-ape remains discovered in Kenya

    Newly unearthed fossils of a 9.8-million-year-old ape in eastern Africa come from a creature that may have evolved into a common ancestor of African apes and humans.

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  3. Earth

    Hey, What about Us?

    The plight of polar bears may get most of the attention as climate change disrupts the Arctic ice, but plenty of other species, from walrus and seals to one-celled specks, are also going to see their world change radically.

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  4. Computing

    Social Networking for Zebras

    Scientists are developing a new branch of network theory to understand zebra communities.