News

  1. Life

    Gut bacteria come in three flavors

    Everybody has one of a trio of types — and which one seems to be less important than how the bugs behave.

    By Tina Hesman Saey
  2. Physics

    Scientists see the one-way light

    Nonlinear materials that allow directional discrimination of waves could be used to make components for light-based computers.

    By Devin Powell
  3. Humans

    Killing fields of ancient Syria revealed

    Stone corrals were used to trap whole herds of animals for mass slaughter.

    By Daniel Strain
  4. Space

    NASA pulls out of astrophysics missions

    Europe is now on its own for two planned spacecraft to study black holes and gravitational waves.