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  1. Anthropology

    Chimps indifferent to others’ welfare

    New laboratory experiments suggest that chimpanzees, unlike people, don't care about the welfare of unrelated members of their social groups.

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  2. Physics

    A matter of gravity

    Gravity Probe B has finished its test of general relativity but results of the study won't be known for another year.

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  3. Questions on the Couch

    A new policy statement on evidence-based practice from the American Psychological Association illustrates the intense struggle among researchers and clinicians over how best to study the effectiveness of psychotherapy in its many forms.

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  4. Math

    Pushing the Limit

    Scientists are moving closer to constructing superefficient, noisefree data-transmission codes.