The Chinese people had invented the compass, paper, the printing press, gunpowder, the seismograph, the crossbow, and the umbrella; they had sailed to Africa in the fifteenth century; they had constructed the Great Wall; over the past decade they had built their economy at a rate never before seen in the developing world. They could return a rental car with exactly three-eighths of a tank of gas, but filling it was apparently beyond the realm of cultural possibility.