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Mrs. Giffords is undergoing rehab in Houston for a gunshot wound to the head. She was critically wounded Jan. 8 in Tucson, Ariz., during a political event. She attended Capt. Kelly’s launch May 16 and, two days later, underwent skull reconstruction.

She is not expected to be at Kennedy Space Center for Endeavour’s homecoming, given the inconvenient hour: 2:35 a.m.