Feature

  1. Health & Medicine

    Whooping cough bounces back

    A new type of pertussis vaccine introduced in the late 1990s may have led to the return of a disease that was nearly eradicated 40 years ago. Public opposition to vaccination hasn’t helped matters.

    By Nathan Seppa
  2. Earth

    Buying time when quakes hit

    On the West Coast, geologists are developing an earthquake warning system that can provide seconds of notice before destructive shaking begins. The system could be ready before the next big quake hits.

    By Alexandra Witze
  3. Cosmology

    Cosmic question mark

    Two ways of measuring the universe’s expansion rate disagree by about 10 percent. One of the methods may be flawed.