NASA Sets Briefings to Provide Update About Hubble Shuttle Mission

WASHINGTON -- NASA will hold news briefings April 23 to update reporters about the space shuttle's fifth and final servicing mission to the Hubble Space Telescope. NASA Television and the agency's Web site will provide live coverage of the briefings from NASA's Johnson Space Center in Houston and NASA Headquarters in Washington.Shuttle Atlantis' 11-day flight, designated STS-