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  1. Rattle and Hum: Molecular machinery makes yeast cells purr

    Molecular-motor proteins inside a yeast cell can cause the cell walls to vibrate.

    By Alexandra Goho
  2. Planetary Science

    Saturn Watch: Cassini finds two new moons and lightning

    The Cassini spacecraft has detected two moons that may be the smallest ever found around Saturn as well as changes in the character of lightning first detected in Saturn's atmosphere in the early 1980s.

    By Ron Cowen
  3. Health & Medicine

    Unorthodox Strategy: New cancer vaccine may thwart melanoma

    In experiments on mice, destroying good skin cells can induce the immune system to kill cancerous versions of these cells.

    By Nathan Seppa
  4. Astronomy

    Cosmic Melody

    An astronomer has converted fluctuations in the density of the early universe—the seeds of the first galaxies and stars—into audible sound.