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  1. Health & Medicine

    Fewer Drugs, Same Outcome: Simpler HIV regimens are effective

    In two studies, AIDS clinicians found that standard three-drug regimens fight HIV as well as four-drug treatments do, and that a single drug might maintain a patient's health once the virus is suppressed.

    By Eric Jaffe
  2. Astronomy

    New Solar System? Twelve planets and counting (Updated)

    According to a new proposal, the solar system has 12 planets instead of the familiar 9, with several dozen more to come.

    By Ron Cowen

  3. 19721

    I was sorry to learn Pluto did not qualify as a planet (this article and “Doggone! Pluto gets a planetary demotion,” SN: 9/2/06, p. 149). Pluto has a diameter comparable with the Earth’s moon.