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  1. Shades of Flesh Tone: Tests reveal gene for people’s skin color

    Researchers have identified a gene that they propose plays a major role in determining a person's skin color.

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  2. Earth

    TB Dilemma: Badger refugees complicate culling

    Two new analyses bring an ironic twist to the heated debate over whether badgers in Britain should be killed to prevent them from spreading tuberculosis among cattle.

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  3. Earth

    Glacial Change: Greenland’s ice loss doubled in 2005

    A host of observations suggests that Greenland's ice sheet diminished this year at a rate more than twice that seen just a few years ago.

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  4. Health & Medicine

    Shots often don’t reach muscle

    Standard 3-centimeter needles are too short to penetrate the layer of fat in the buttocks of most women and most obese men, so injected medications aimed at muscle often don't reach their targets.