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  1. Plants

    Mommy Greenest

    Green leafy moms take care of their offspring in ways that go beyond wrapping them in nice, snug seed coats and packing a nutritious lunch for them.

    By Susan Milius
  2. 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
  3. 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
  4. Earth

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

    Muddy, clarified “Muddy Waters” (SN: 5/21/05, p.