Bicycle was invented by Sifrak in France. One day, he was walking on a street in Paris. It was raining heavily on the road and it was difficult to walk. Suddenly, a carriage rolled in from behind, and Sifrak was splashed with mud and rain. When others saw it, they felt sorry for him and wanted to stop the carriage and negotiate rationally. Sifrak stopped him, but when the carriage left, he stayed where he was. He was thinking: the carriage should be cut in half, and four wheels should become two wheels … so he went home and started to do it. After repeated experiments, in 179 1 year, the first "wooden horse wheel" car was built, but only two feet could be pushed forward.