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同学们都玩过“陀螺”:用鞭子缠绕陀螺 几圈再放到地面上一拉(或用手指一拧),陀 螺就转动起来了;这时用鞭子抽打它,它会在 一个稳定的状态下急速旋转起来．如果你把 旋转陀螺抛向空中,它的轴依旧保持原来的 方向,而且落在地面上仍然转动着．为什么? 这一问题可不简单了,它就是世界上著名 的“数学水妖”问题．也就是说小小的陀螺蕴含 着大大的科学．这一问题在1888年之前世界 上可是没人能解答的．法兰西科学院曾两次向 世界悬赏三千法朗征集解答都未果．直到 1888年第三次举办该问题的国际有奖征文,
All the students had played “gyro”: When the gyro was wrapped in a whip several times and put on the ground, it was pulled (or twisted with a finger), and the gyro turned up; when it was whipped with a whip, it would be in a stable state. Spin up quickly. If you throw the spinning gyroscope into the air, its axis still keeps its original direction, and it still rotates on the ground. Why? This problem is not simple, it is the world’s famous “macro-water demon” problem. In other words, a small gyro contains great science. This problem was before 1888 in the world but nobody can solve it. The French Academy of Sciences had twice offered a reward of 3,000 francs to the world. The international prize essay was held for the third time until 1888.