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  1. Health & Medicine

    Lo-Cal bones hold up

    One study of many recent investigations of how calorie restriction affects people shows that bone density does not necessarily suffer when a person loses weight quickly.

    By Nathan Seppa
  2. Space

    Around the ring

    The first protons beamed out at the Large Hadron Collider.

    By Ron Cowen
  3. Math

    Largest known prime number found

    The Great Internet Mersenne Prime Search, a cooperative computing project, helps find a prime that has nearly 13 million digits.

    By Julie Rehmeyer
  4. Life

    FDA releases guidelines for genetically modified animals

    Draft rules lay out policies for approving altered animals, including those used for food.