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  1. Anthropology

    The Ultimate Colonists

    Human ancestors managed to adjust to life in a variety of ecosystems during the Stone Age, indicating that their social lives were more complex than they've often been given credit for.

    By Bruce Bower
  2. Materials Science

    Microbial Materials

    Microorganisms can be coaxed into producing high-tech components and can themselves serve as valuable ingredients in new classes of materials.

    By Jessica Gorman
  3. Animals

    Life Without Sex

    The search is on for creatures that have evolved for eons without sex.

    By Susan Milius
  4. Astronomy

    Mystery in the Middle

    The Milky Way's core is loaded with seemingly young stars, which have no business being there.