曾经有一位实验者往一个玻璃杯里放进一只跳蚤,跳蚤立即轻易地跳了出来。再重复几遍,结果还是一样。接下来,实验者再次把这只跳蚤放进杯子里,但在杯上加了一个玻璃盖。“嘣”的一声,跳蚤重重地撞在玻璃盖上。一次次被撞,跳蚤渐渐变得“聪明”起来了,它开始根据盖子的高度来调整自己跳跃的高度。再过了一阵子,这只跳蚤在盖子下面自由地跳动,再也没有撞到这个盖子。 There was an experimenter who put a flea in a glass and the flea jumped out immediately. Repeat several times, the result is still the same. Next, the experimenter put the flea into the cup again, but added a glass cover to the cup. “嘣 ” sound, fleas heavily hit the glass cover. Hit again and again, fleas gradually become “smart” up, it began to adjust according to the height of the lid to jump height. After a while, the flea was beating freely under the lid, never touching the lid again.