On May 20, 1969, at 12:30 p.m. EST, a 363-foot, thirty-story-high black-and-white Saturn V rocket known as AS-506 was painstakingly trundled five miles across the raging heat and searing green of central Florida's eastern coast by an eleven-man Kennedy Space Center crew aboard the world's third-largest land vehicle, a six-million-pound, tank-wheeled crawler out of NASA's Vehicle Assembly Building, itself a 129-million-cubic-foot edifice so massive that its steel accordion doors were forty-five stories high and, without its ten-thousand ton air conditioner, interior clouds would form under its 525-foot-high ceiling...and it would rain.