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  1. Math

    Shadows of the Fourth Dimension

    In a new book, artist Tony Robbin presents his vision of the fourth dimension in science, art, and modern thought. For more math, visit the MathTrek blog.

    By Ivars Peterson
  2. Humans

    From the April 4, 1936, issue

    Hidden blossoms of spring, postponing old age, and the future of atomic energy.

    By Science News
  3. Math

    Math Focus on Internet Security

    Internet security is the theme for this year’s Mathematics Awareness Month, highlighting the crucial role that mathematics plays in the development of cryptosystems. This Web site provides information and resources for celebrating Mathematics Awareness Month. Go to: http://www.mathaware.org/mam/06/

    By Science News
  4. Humans

    Letters from the April 8, 2006, issue of Science News

    Hot and cold “Warming climate will slow ocean circulation” (SN: 2/4/06, p.