Alan Kay: A powerful idea about teaching ideas

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Alan Kay 把加速度拆成两个可运行的步骤：每轮先增加速度，再按速度增加距离。学生后来用等时间隔拍摄的落体图像测位移，认出了自己写过的规律。

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of saying, "OK, I'm going to increase the speed by two each time, and then I'm going to increase the distance by the speed each time?

So what I'm doing is measuring from the bottom of one image to the bottom of the next image, about a fifth of a second later,