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  1. 19404

    What an amazing time resolution for 34 million years ago! Could the temperature changes recorded reflect seasonal eel migration, rather than changes in the Gulf of Mexico? Are the results consistent between otoliths found in close association? Does this offer a method of more precise dating similar to the use of tree rings? Gordon C. […]

    By Science News
  2. Math

    Anatomy of a Bead Creature

    Beadwork offers a novel view of hyperbolic geometry.

    By Ivars Peterson
  3. Math

    Functions on Display

    To mathematicians, the term “function” has a specific meaning. It’s a rule that assigns a fixed output for a given input; in effect, a formula. Among the most familiar functions are the sine and cosine functions of trigonometry.