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  1. Life

    Fruit fly bodies bank stem cells

    Stem cells carve their own niches.

    By Tina Hesman Saey
  2. Physics

    Symmetry found hidden in supercold atoms

    Scientists have detected an elusive, complex symmetry in the frequencies of resonating particles

    By Rachel Ehrenberg
  3. Space

    Gamma-ray burst may reveal some of oldest dust in the universe

    Remote flash may have uncovered supernova-generated dust from just 1 billion years after the Big Bang

    By Ron Cowen
  4. Life

    Bornavirus genes found in human DNA

    Researchers have found molecular fossils of an RNA virus in human and other mammalian genomes, pushing back the emergence of RNA viruses millions of years.