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  1. Anthropology

    Ethiopians reveal high-altitude twist

    To the surprise of researchers, blood measures of oxygen-rich hemoglobin in Ethiopian villagers living more than 2 miles above sea level are the same as those of lowland dwellers.

    By Bruce Bower
  2. Anthropology

    Ethiopians reveal high-altitude twist

    To the surprise of researchers, blood measures of oxygen-rich hemoglobin in Ethiopian villagers living more than 2 miles above sea level are the same as those of lowland dwellers.

    By Bruce Bower
  3. Physics

    Prying apart antimatter

    Matter and antimatter look reassuringly alike in physicists' first investigations of energy levels of antihydrogen atoms.

    By Peter Weiss
  4. Physics

    Prying apart antimatter

    Matter and antimatter look reassuringly alike in physicists' first investigations of energy levels of antihydrogen atoms.