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  1. Tech

    In Its Own Image: Simple robot replicates itself block by block

    A robot made by stacking identical, cubelike modules has demonstrated that it can copy itself.

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  2. Health & Medicine

    Watch and Wait, or Not: Studies weigh risks of delaying prostate surgery

    Two long-running studies of men with prostate cancer have partly clarified the risks of postponing treatment of the disease.

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  3. Chemistry

    Metal Rebel: Under extreme pressure, sodium breaks the rules for turning into liquid

    In a demonstration that defies certain basic assumptions in physics, researchers have created liquid sodium at room temperature under high pressures.

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  4. DNA’s Moody Temperament: Gene variant linked to depression-ready brain

    A common version of a gene involved in regulating the neurotransmitter serotonin creates a brain that responds sensitively to stress and is therefore more likely to become depressed.