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  1. Physics

    Soot hastens snowmelt on Tibetan Plateau

    Black carbon pollution is a more potent driver of melting in the region than increases in carbon dioxide, a new computer simulation suggests.

    By Janet Raloff
  2. Science & Society

    Humans

    The sophisticated lives of early North Americans, plus third arms and drunken memories in this week's news.

    By Science News
  3. Health & Medicine

    ‘Diabetes Belt’ outlined

    The Deep South and Appalachia show a high prevalence linked to obesity, poor educational achievement and a sedentary lifestyle, a study shows. 

    By Nathan Seppa
  4. Space

    The best next space missions

    The National Research Council issues recommendations for planetary science projects that NASA and NSF should fund starting in 2013.