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  1. Earth

    Toxic Surfs

    Scientists have discovered not only three new mechanisms by which an alga species in Florida water can poison but also a trio of natural antidotes produced within that same species.

    By Janet Raloff
  2. Math

    Closing the Gap on Twin Primes

    A long-sought proof that there are infinitely many pairs of primes that differ by only 2 may not be far away.

    By Ivars Peterson
  3. Earth

    Letters from the July 16, 2005, issue of Science News

    Muddy, clarified “Muddy Waters” (SN: 5/21/05, p. 328), on the deleterious effect of dams on coastal systems, contains a major conceptual error. It states that “another important cause of the ground sinking is the waning of sediment deposition by the Mississippi River.”