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  1. Humans

    Letters from the March 12, 2005, issue of Science News

    Cheaters like us? The model for the emergence of a population of “cheaters” out of a population of “cooperators” described in “When Laziness Pays: Math explains how cooperation and cheating evolve” (SN: 1/15/05, p. 35) gives a fresh viewpoint on existing ecosystems—and much more. Might the evolution of asymmetric modern sex from symmetric DNA exchange […]

    By Science News
  2. Health & Medicine

    Inner-brain electrode may curb depression

    Deep-brain electrical stimulation has shown promise in treating severe depression.

    By Christen Brownlee
  3. Astronomy

    Radiation from a baby star

    X-ray telescopes have captured the earliest and clearest view of the core of a gas cloud about to transform into a star.