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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.

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  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.

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  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.

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  4. Earth

    Waters near croplands impair frogs’ immunity

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