Article Photos: Shuttle crossing provides a unique teaching moment 6/7

  A worker welds steel plates prior to the transfer of the space shuttle Endeavour in Los Angeles, Thursday, Oct. 11, 2012. Beginning Friday, the shuttle heads off on its last mission, a 12-mile creep through city streets. It will move past an eclectic mix of strip malls, mom-and-pop shops, tidy lawns and faded apartment buildings. Its final destination: California Science Center in South Los Angeles where it will be put on display. (AP Photo/Jae C. Hong)