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  1. Earth

    Ozone hole on the mend

    Researchers claim to see atmospheric healing more than a decade earlier than a detectable uptick was expected.

    By Alexandra Witze
  2. 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
  3. Health & Medicine

    Gravely damaged brains have ‘bottleneck’

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

    By Daniel Strain
  4. 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.