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  1. Animals

    Swimming evolved several times in treetop ants

    Certain ants living in tropical forest canopies turn out to be fine swimmers.

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  2. Animals

    Feedback

    Readers discuss mammal milk, ancient human genetics and hand washing techniques.

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  3. Tech

    Scientists struggle to find signals in the noise

    Even in a simple system like email, detecting the signal from the noise is not always easy. It can be even more difficult separating a dazzling discovery from dust or whether a breast mass is cancerous or benign.

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  4. Health & Medicine

    Mammography’s limits becoming clear

    It may be time to move way from blanket recommendations about mammography and empower women to decide for themselves, new work suggests.