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  1. Math

    Classroom Birthdays

    What's the probability of finding matching birthdays in a small group?

    By Ivars Peterson
  2. Humans

    Letters from the April 23, 2005, issue of Science News

    The shark as red herring I’m sure you published “A Fishy Therapy,” (SN: 3/5/05, p. 154) in good faith, but I believe that claims for shark cartilage are not made seriously by anyone who studies the role of natural substances in cancer prevention. It was proved ineffective long ago. I think your article does a […]

    By Science News
  3. Humans

    From the April 20, 1935, issue

    Workings of human body portrayed in new exhibit, tapping brain waves to study epilepsy, and the discovery of a new amino acid.