News

  1. Chemistry

    Building big molecules bottom-up

    Using templates, chemists make ring structures on the scale of biological machinery.

    By Rachel Ehrenberg
  2. Paleontology

    Oceans may have poisoned early animals

    High sulfur and low oxygen produced a deadly brew nearly 500 million years ago that apparently stalled a burst of evolutionary change.

    By Alexandra Witze
  3. Health & Medicine

    Second chicken pox shot boosts coverage

    Giving a follow-up vaccination increases coverage to more than 98 percent of kids who receive it, a study finds.

    By Nathan Seppa
  4. Health & Medicine

    How the brain shops

    Using implanted electrodes, researchers find individual neurons associated with attaching value to objects.