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  1. Earth

    Prions’ dirty little secret

    The malformed proteins responsible for mad cow disease bind tightly to clay, a finding that points to farm soil as a potential long-term reservoir for these infective agents.

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  2. Depression’s rebirth in pregnant women

    Expectant mothers who temporarily stop taking their antidepressant medication stand a good chance of sinking back into depression while pregnant.

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  3. Health & Medicine

    Newborn head size linked to cancer risk

    Healthy newborns with big heads face an increased risk of brain cancer.

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  4. Animals

    Hawk skin sends UV signal

    The patch of skin above a hawk's beak looks orange-yellow to us, but to another hawk, it may broadcast ultraviolet sex appeal.