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  1. Physics

    Peer Pressure in Numbers: Physicists model the power of social sway

    A mathematical model of peer-influenced behavior may help explain some unexpected patterns that have been observed in financial data and bird populations.

    By Kristin Cobb
  2. Planetary Science

    Lost in Space: Comet mission appears to have broken apart

    A spacecraft that had just begun its journey to two comets has fallen silent and may have broken apart.

    By Ron Cowen
  3. Earth

    Global Impact: Space object may have spread debris worldwide

    Sediments laid down about 3.47 billion years ago in what are now western Australia and eastern South Africa contain remnants of what may have been an extraterrestrial-object impact large enough to disperse debris over the entire planet.