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  1. Animals

    Dee for Danger: Chickadees add notes as threat grows

    Chickadees change their alarm calls depending on how serious a lurking predator seems.

    By Susan Milius
  2. Paleontology

    Killer Bite: Ancient, tiny mammal probably used venom

    Paleontologists have unearthed the remains of an ancient, mouse-size mammal that seems to have had a venomous bite.

    By Sid Perkins
  3. Humans

    Letters from the June 25, 2005, issue of Science News

    Dark secret? “Dark Influence: Most of the universe’s matter is out of sight, but not out of mind” (SN: 4/23/05, p. 264) made me wonder about the possibility of a continuum of matter. Could part of the problem in identifying dark matter be that only part of the spectrum of matter is observable by our […]

    By Science News
  4. Health & Medicine

    Alcohol increases bacterium’s virulence

    Drinking alcohol can increase the ability of one type of bacteria to cause disease.