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  1. Animals

    Naked and Not

    The Damaraland mole rat may be less famous than its naked cousin, but both have some of the oddest social structures found in a mammal.

    By Susan Milius

  2. Nurture Takes the Spotlight

    What a person eats, what chemicals he or she is exposed to, and other features of a person's environment chemically modify chromosomes, thereby changing how genes are ultimately expressed.

    By Christen Brownlee
  3. Math

    Folding Perfect Thirds

    Origami provides a hands-on way to explore mathematical concepts. For more math, visit the MathTrek blog.

    By Ivars Peterson
  4. Humans

    From the June 13, 1936, issue

    A giant spectrographic camera and an electric fencing judge.