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Shuttle "discovery." they are now past the halfway point of their 12-day mission and marks the final voyage of the final discover dvr. it will be retired after its scheduled touchdown next tuesday. last hour on cnns "american morning," steve lindsey took stock of what he called a successful mission. >> well, so far, the mission has been fantastic. we have accomplished most of our major objectives already. we had two successful space walks and accomplished all of those objectives plus a whole bun...