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  1. Genetics

    The Newly Sequenced Genome Bares All

    The mapped human genome begins to reveal its secrets.

    By Jessa Netting and Linda Wang
  2. Math

    Immersed in Klein Bottles

    “Need a zero-volume bottle? Searching for a one-sided surface? Want the ultimate in nonorientability?” One way to depict a Klein bottle. Computer-generated image by John Sullivan, University of Illinois at Urbana-Champaign Joining the top and bottom of this rectangle produces a cylinder. Matching the arrows of the remaining two sides produces a Klein bottle. One […]

    By Ivars Peterson

  3. From the February 14, 1931, issue

    SMALL CHANGES OF SUN’S HEAT CONTROL WEATHER ON EARTH The sun when it radiates heat and light to Earth also broadcasts information that can be used to foretell the weather here on Earth.