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  1. Math

    Möbius at the Shopping Mall

    Möbius strips can show up in the unlikeliest places.

    By Ivars Peterson
  2. Math

    Pentomino Sudoku

    A contest features a combination of sudoku and tiles called pentominoes.

    By Ivars Peterson
  3. Humans

    Letters from the May 20, 2006, issue of Science News

    Forget dessert In “Got Data? Consuming calcium, dairy doesn’t keep off weight” (SN: 3/11/06, p. 147), you report, “Every 4 years, each volunteer completed a questionnaire about his body weight and dietary habits.” Any dieter knows that it is next to impossible to remember what one has eaten 4 days ago. Any more details on […]

    By Science News

  4. From the May 16, 1936, issue

    Long-lived cicadas, zinc coatings for wire, and schizophrenia's cause.