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  1. Math

    Sand Drawings and Mirror Curves

    To accompany the telling of a story or recounting of a fable, men of the Chokwe people in south-central Africa traditionally made sand drawings, called sona, to illustrate the tale. These highly stylized geometric illustrations also served as memory aids. Sand drawing. Paulus Gerdes Plaited mat designs. Mark Schlatter Lion’s stomach design. Mark Schlatter Example […]

    By Ivars Peterson

  2. From the September 19, 1931, issue

    ORCHIDS THAT LOOK LIKE GIRLS Plucked from their stems and stood on the table, they are the daintiest little dancers imaginable–dancers in the latest fashionable costumes at that. Their skirts are long and concealing, tight over the slim hips and flaring widely at the bottom.