Medicine
  • In this Monday, Oct. 10, 2011 photo, the box for a Sephora Collection Pink Eyelash Curler is displayed in Philadelphia.

    Scientists have found new evidence for a theory about why some cancers return after they've seemingly been wiped out. Three studies in mice say tumors contain a pool of cancer stem cells that can multiply and seed the tumor's regrowth.

    LAST UPDATE : Aug 20, 2012, 3:40 PM EDT
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