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  1. Math

    Problems to Sharpen the Young

    Medieval brainteasers have kept students and other people puzzled and entertained for centuries.

    By Ivars Peterson
  2. Humans

    Willis Harlow Shapley (1917-2005)

    Willis Harlow Shapley, a longtime member of the Science Service Board of Trustees, died Oct. 24.

    By Julie Ann Miller
  3. Humans

    Letters from the November 19, 2005, issue of Science News

    It’s not there “Organic Choice: Pesticides vanish from body after change in diet” (SN: 9/24/05, p. 197), as presented, doesn’t address the statement made in the headline. The article shows only that on days when no pesticides are ingested in food, no pesticides are excreted in urine. Charles WyttenbachLawrence, Kan.