John Grunsfeld, an astrophysicist and astronaut who fixed the Hubble Space Telescope, has been chosen as associate administrator of NASA's science mission directorate, according to sources with knowledge of the selection. Grunsfeld is currently deputy director of the Space Telescope Science Institute in Baltimore, Maryland, which operates Hubble. He would replace Ed Weiler, who resigned in September. See go.nature.com/ u929zt for more.
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