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  1. Life

    Body attacks lab-made stem cells

    In mice, the immune system targets and destroys reprogrammed adult skin cells, raising questions about their medical potential.

    By Tina Hesman Saey
  2. Health & Medicine

    Gravely damaged brains have ‘bottleneck’

    A failure in electrical signaling may distinguish patients in vegetative states.

    By Daniel Strain
  3. Health & Medicine

    Body & Brain

    Heart attacks are worse in the morning, plus who remembers dreams, stem cells in lungs and more in this week’s news.

    By Science News
  4. Humans

    Stone Age cold case baffles scientists

    Stone-tool makers who hunkered down near Arctic Circle left uncertain clues to their identity.