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  1. Winter depression may heed hormonal signal

    A biological signal of seasonal change, similar to that observed in many mammals, appears to trigger recurring cases of winter depression.

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  2. Tech

    Little lamp may set quantum tech aglow

    By reliably emitting just one photon when excited by just one voltage pulse, a sophisticated takeoff on a common class of tiny lamps called light-emitting diodes, or LEDs, may help usher in exotic technologies that rely on quantum mechanics, including quantum cryptography and quantum computers.

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  3. Health & Medicine

    Boost in protein repair extends fly lives

    In warmer-than-normal conditions, fruit flies that overproduce a protein-repair enzyme live about one-third longer than typical flies.