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  1. Gene found for big, firm sheep rumps

    Scientists have found the gene that gives sheep unusually big, muscular bottoms.

    By Susan Milius
  2. Tech

    Ribbon to the Stars

    Advances in one of the tiniest of technologies—carbon nanotubes—is bringing the concept of a space elevator closer to reality.

    By Ron Cowen

  3. A Man’s Job

    Sperm contain an unexpected payload of RNA, a discovery offering insight into infertility, cloning, and contraception.

    By John Travis
  4. Humans

    From the October 1, 1932, issue

    WARNING SPOTS OR TARGETS? Eye-spots, like those on the wings of the Cecropia moth on the front cover, are commonly interpreted either as warning markings, to scare off enemies, or as “targets” to draw the enemy’s attention to a non-vital spot.