Uncategorized

  1. Ecosystems

    Spring Forward

    Scientists who study biological responses to seasonal and climatic changes have noted that the annual cycles for many organisms are beginning earlier on average, as global temperatures rise.

    By Sid Perkins
  2. Math

    Turtle Tracks

    One way to describe a geometric figure is in terms of the path generated by a moving point. Instead of defining a square, for example, as a four-sided polygon with equal sides and angles, you can call it the path generated by the following rule: Go straight for a distance s, turn 90 degrees right, […]

    By Ivars Peterson

  3. Pass the Genes, Please

    Gene swapping muddles the history of microbes.

    By John Travis

  4. 19227

    The July 22 cover, “Sticker shock,” and the related article say that the powerful forces that arise at the surface of micromachines weren’t expected.