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  1. Earth

    Moderate flows help carve rivers

    Measurements of erosion in a rocky river channel in Taiwan suggest that the day-to-day flow of water accounts for more rock wear there than occasional catastrophic floods do.

    By Sid Perkins

  2. Gene found for big, firm sheep rumps

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

    By Susan Milius
  3. 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

  4. A Man’s Job

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