News

  1. Physics

    Spectral atom rings in

    Electron waves can generate a phantom atom when a real atom is placed at the right spot inside an elliptical quantum corral, or loop of atoms, arranged on a surface.

    By Peter Weiss
  2. Health & Medicine

    One more reason to worry

    A single dose of the AIDS drug nevirapine, given to mothers to help prevent them from infecting their children during birth, may be enough to prod the virus to develop drug resistance.

    By Damaris Christensen
  3. Health & Medicine

    HIV may date back to the 1930s

    Genetic analysis of the AIDS virus suggests it first infected humans in the first third of the 20th century.