Some interesting statistics:
Discovery flew both return-to-flight missions after its sister ships, Challenger and Columbia, were lost. It launched the Hubble Space Telescope. It carried John Glenn, one of America's first space pioneers, on his sentimental return to space in 1998. It assembled the first components of the International Space Station. It has flown more times than any other spaceship in history: 39 missions, 365 days in space, 5,830 orbits of the Earth, 148,221,665 miles traveled. It has gone through 39 sets of landing-gear tires since its first flight in 1984.