Science & Society

  1. Archaeology

    Symbols from the Stone Age

    Rocks found in a cave suggest the people used objects and colors to stand for other things more than 90,000 years ago.

  2. Genetics

    Baby swaps, crime scenes, and DNA testing

    By looking at animal DNA, investigators are solving crimes and conservationists are helping save endangered species.

  3. Humans

    A human migration fueled by dung?

    When people crossed from Asia to the Americas thousands of years ago, burning dung may have kept them warm.

  4. Environment

    Cliff snails and rock climbers

    Rock climbers can accidentally wipe out communities of cliff snails.