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  1. Math

    Benjamin Franklin Plays Sudoku

    Founding father entertained himself devising beautiful mathematical puzzles.

    By Julie Rehmeyer
  2. Astronomy

    Four’s a crowd

    Astronomers have found a quartet of stars packed into a region smaller than Jupiter's orbit around the sun.

    By Ron Cowen
  3. Astronomy

    Gravity at play: A double lens

    Astronomers have discovered an extraordinarily rare double cosmic mirage.

    By Ron Cowen
  4. Astronomy

    Case of the misshapen disk

    A deformed disk around a young star may have gotten its swept-back appearance as the result of a collision with a dense gas cloud.

    By Ron Cowen

  5. 9/11 attacks stoked U.S.