A piece of the ill-fated space shuttle Columbia has surfaced in eastern Texas, where a severe drought has dried up a lake and exposed debris from the 2003 accident, NASA said Tuesday. The globe-shaped object that turned up in Lake Nacogdoches, north of Houston, was one of 18 tanks on Columbia that helped power the shuttle, said NASA spokeswoman Lisa Malone. Member of NASA's Columbia Reconstruction Team is pictured at the Kennedy Space Center in 2003 "Late last week, we were contacted by the Nacogdoches sheriff's office letting us know that they had found an item of what they thought...