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  1. Earth

    A Feverish World

    What's behind global warming—and is there anything we can do?

    By Agnieszka Biskup

  2. A moment on the lips …

    Adults may be stuck with the fat they have. A study suggests the number of fat cells doesn't change with weight gain or loss.

    By Tina Hesman Saey
  3. Math

    Insights into symmetry

    This year's Abel Prize goes to mathematicians involved in group theory.

    By Julie Rehmeyer
  4. Life

    Coral keeps it in the family

    The nutrients released during mass coral spawning feed the whole ecosystem.

    By Tia Ghose

  5. Trouble with truffles

    A Chinese truffle species has invaded Italy, raising fears that the newcomer could overgrow the Italian black truffle on its home territory.