它脚底的力量，竟然来自宇宙中最基本的物理学原理——分子引力。
It is foot power, even from the most basic principles of physics in the universe - molecular attraction.
如果观察沙摊上的脚印，就可以清楚地看到脚底的受力点主要在脚后跟和脚前掌。
When I look at a foot print on sand it is very clear to see that the main force goes to the heel and ball.
脚底的热量作用在上层薄片，较冷的地面作用在下层薄片，好了，电就这样产生了。
Heat from the foot is applied to the top side of the wafer, and cold from the ground is applied on the other side, and voila: electricity.
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