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  1. Health & Medicine

    Parkinson’s implants survive in brain

    Human embryonic stem cells transplanted into the brains of people with Parkinson's disease survive and grow better in patients under 60 years of age than in older patients.

    By Nathan Seppa
  2. Astronomy

    Creating a warmer, wetter Mars

    A new study adds to the evidence that past volcanic activity could have temporarily created a warmer, wetter Mars, a place on which water once flowed freely.

    By Ron Cowen

  3. Things That Go Thump

    There's a whole world of animal communication by vibration that researchers are now exploring.

    By Susan Milius

  4. From the March 21, 1931 issue

    MUSHROOMS SUDDEN GROWTH FOLLOWS LONG PREPARATION Quick as a mushrooms growth, is the phrase we like to apply to sudden and unexpected developments.