News

  1. Cells in bloodstream don’t refill ovaries

    Contrary to a report published last year, cells that circulate in a female mammal's blood don't seem to restock its egg supplies.

    By Christen Brownlee
  2. Anthropology

    Mexican find reveals ancient dental work

    A 4,500-year-old human skeleton found in Mexico represents the earliest instance in the Americas of intentionally modified teeth, apparently to create space for a ceremonial mouthpiece.

    By Bruce Bower
  3. Paleontology

    Sticky Subjects: Insights into ancient spider diet, kinship

    Remnants of a spider web embedded in ancient amber suggest that some spiders' diets haven't changed much in millions of years.

    By Sid Perkins
  4. Earth

    Toxic Leftovers: Microbes convert flame retardant

    Bacteria can break down a common flame retardant into more-toxic forms.