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  1. Ebola protein explains deadly mystery

    The infamous virus called Ebola has a surface protein that kills cells in blood vessels.

    By John Travis
  2. Astronomy

    Evidence grows for nearby planetary system

    Astronomers have found the nearest known planet that lies outside the solar system, a mere 10.5 light-years from Earth.

    By Ron Cowen
  3. Chemistry

    Crystal Reveals Unexpected Beginnings

    For the first time, researchers have directly observed a protein begin to crystallize, and they've found it has a peculiar shape.

    By Jessica Gorman
  4. Humans

    From the April 8, 1933, issue

    MT. WASHINGTON COLDER THAN THE ANTARCTIC Rigor of winter at the summit of Mt.