This week marks the end of the Space Shuttle program. It may well mark the end of America's manned exploration of space. Though I know the vast majority of American's won't even mark the passing, I will. To my mind, this was the greatest endeavor and greatest achievement in human history-- greater than the pyramids, the Great Wall, the transcontinental railroad. Yes, we may send astronauts into space, hitchhiking or taking the equivalent of an interplanetary taxi-cab, but the great enterprise is gone.