NASA Astronaut Tweets Provide Inside Look at Mission Training

HOUSTON -- NASA astronaut Mike Massimino is using Twitter to provide a unique, behind the scenes peek at the last weeks of his training for the fifth and final shuttle servicing mission to NASA's Hubble Space Telescope.Massimino, whose Twitter username is Astro_Mike (@Astro_Mike), will fly aboard space shuttle Atlantis as a mission specialist and spacewalker during the