The popular framing of the question — why has no human walked on the Moon since 1972? — usually proceeds as though there is some technical answer to be found. The rockets must have stopped working. The engineering must have been forgotten. The expertise must have been lost in the half-century since Apollo 17 splashed […] The popular framing of the question — why has no human walked on the Moon since 1972? — usually proceeds as though there is some technical answer to be found. The rockets must have stopped working. The engineering must have been forgotten. The expert... [8177 chars]