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  1. 19746

    I am a retired high school mathematics teacher who has quilted mathematical ideas for over 20 years. Currently, I am working on a quilt called Pascal’s Pumpkin. I was totally excited by this article and began to think about quilting some spidrons! Elaine EllisonWest Lafayette, Ind.

    By Science News
  2. Math

    Swirling Seas, Crystal Balls

    A remarkable geometric shape made up of a sequence of triangles leads to a host of intriguing forms and mobile structures.

    By Ivars Peterson

  3. Air’s oxygen content constrains insect growth

    The size to which insects grow is limited by their need to route oxygen to tissues in their legs.

    By Ben Harder
  4. Earth

    Waters near croplands impair frogs’ immunity

    Pesticide-containing waters leave frogs more susceptible to fungal infections than pristine environments do.