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By Eric Hand of Nature Magazine On 4 January, John Grunsfeld, the fix-it-man for the Hubble Space Telescope, became the head of NASA's Science Mission Directorate. [More]

By Eric Hand of Nature magazine John Grunsfeld, an astrophysicist and astronaut who fixed the Hubble Space Telescope, has been chosen to lead NASA's science mission directorate, according to several sources with knowledge of the selection.