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  1. Humans

    Letters

    Letters from the Nov. 29, 2003, issue of Science News.

    By Science News
  2. Math

    The Cow in the Classroom

    “Miss Zarves drew a triangle on the blackboard. ‘A triangle has three sides,’ she said, then pointed to each side. ‘One, two, three.’ She drew a square. ‘A square has four sides. One, two, three, four.’ “She walked around the cow to the other side of the board. She drew a pentagon, a hexagon, and […]

    By Ivars Peterson

  3. There’s no faking it

    The brain activity in men and women having an orgasm is very similar.

    By John Travis

  4. HIV protein breaks biological clock

    The AIDS virus secretes a protein that interferes with an animal's biological clock.