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  1. Anthropology

    Chimps spread out their tools

    Chimpanzees use stones to crack nuts in an African region far from where that behavior was thought to be relegated.

    By Bruce Bower
  2. Anthropology

    Mental Leap

    As scientists discover traits shared by human and ape ancestors millions of years ago, they try to fill in the gaps of human evolution.

    By Eric Jaffe
  3. Chemistry

    Target Practice

    As they study the biochemical processes that make Mycobacterium tuberculosis tick, researchers are finding new targets to exploit to combat the microbe.

    By Aimee Cunningham
  4. Humans

    Letters from the September 2, 2006, issue of Science News

    B line “A Vexing Enigma: New insights confront chronic fatigue syndrome” (SN: 7/1/06, p.