News

  1. Metal in diet harms Colorado birds

    Cadmium, a metal naturally present in south-central Colorado, concentrates at deadly levels in willow plants, poisoning the ptarmigan that rely on the plant during winter months.

    By Ruth Bennett
  2. Health & Medicine

    Weight-loss pill carries risks

    The drug ephedra and its presumed active ingredient, ephedrine, provide only modest weight-loss effects and pose health risks.

    By Nathan Seppa
  3. Astronomy

    All-sky survey makes Internet debut

    An atlas of some 5 million images from the Two Micron All-Sky Survey is now available online.

    By Ron Cowen
  4. Earth

    Mapping watersheds invites comparisons

    Computerized maps of environmental features for 154 of the largest river watersheds will soon be available to the public, free of charge.