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  1. Essence of g

    New efforts to probe the biology of intelligence stir up a long-running controversy over what mental tests actually measure.

    By Bruce Bower

  2. Genghis Khan’s Legacy?

    Genghis Kahn's military success 800 years ago may have spread a particular form of the Y chromosome, one he may have himself carried.

    By John Travis
  3. Planetary Science

    Forgotten Planet

    Mercury: The solar system's inner frontier.

    By Ron Cowen
  4. Health & Medicine

    Stress-prone? Altering the diet may help

    Tailoring a diet to fuel the brain with the precursor of a mood-enhancing chemical may help vulnerable individuals cope with stress.

    By Janet Raloff

  5. Mice can thank a hormone for the memories

    Oxytocin, a hormone previously implicated in mammalian sexual and maternal behavior, may play a role in social recognition in mice.