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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.

    By Bruce Bower
  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.

    By Peter Weiss
  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.