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.

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  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.

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  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.

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  4. Environment

    Cliff snails and rock climbers

    Rock climbers can accidentally wipe out communities of cliff snails.

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