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  1. Health & Medicine

    An aging protein?

    The defective protein that, when defective, causes a premature-aging disease may also play a role in normal aging.

    By Christen Brownlee
  2. Astronomy

    Crust on a star

    By analyzing X rays generated by the rumblings of a neutron star 40,000 light-years from Earth, astronomers have estimated the thickness of the dense star's crust.

    By Ron Cowen
  3. Plants

    Nectar: The First Soft Drink

    Plants have long competed with one another to lure animals in for a sip of their sweet formulations.

    By Susan Milius
  4. Health & Medicine

    Predicting Parkinson’s

    Scientists are searching for ways to detect the earliest signs in the brain of Parkinson's disease.