Feature

  1. Math

    Pieces of Numbers

    A long-sought proof has forged an intriguing link between numbers expressed as sums and as products.

    By Erica Klarreich
  2. Anthropology

    Faithful Ancestors

    A controversial fossil analysis supports the view that, more than 3 million years ago, human ancestors living in eastern Africa favored long-term mating partnerships.

    By Bruce Bower
  3. Animals

    Comeback Bird

    Looking for a long-lost woodpecker had its special challenges, including anticipating what would happen if the hunt actually succeeded.

    By Susan Milius
  4. Tech

    Morphing Memory

    A promising memory technology for future portable gadgets exploits the same atom-shuffling materials that have already led to rewritable CDs and DVDs.