President Obama chose retired astronaut Charles Bolden to head up NASA.  Mr. Bolden is 62 years old and is a retired marine pilot.  Bolden, who became an astronaut in 1981, would be only the second astronaut to serve as an administrator.  The formerly retired astronaut has gone on four spaceflights: the Space Shuttle Columbia, STS-31 Space Shuttle Discovery, Space Shuttle Atlantis, and the STS-60 Space Shuttle Discovery.