News

  1. Cigarette smoke worsens heart attacks

    Breathing in smoke from another person's cigarette causes blood changes that reduce the likelihood that an individual will survive a heart attack.

    By Janet Raloff
  2. Anthropology

    . . . and then takes some lumps

    The skeletal diversity that many scientists use to divide up fossil species in our evolutionary past masks a genetic unity that actually encompassed relatively few species, contend researchers in an opposing camp.

    By Bruce Bower
  3. Anthropology

    Our family tree does the splits…

    Large-scale changes in climate and habitats may have sparked the evolution of many new animal species in Africa beginning 7 million to 5 million years ago, including a string of new species in the human evolutionary family.