And I think we just got to the point where we were able to start looking at the energetics of that.

我认为我们刚刚到这一点,我们才能够开始学习,这里面的能量学。

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That's another invention of the 1600s, by the way-- the thermometer. And they learned that concept-- perfectly natural to us--temperature.

顺便说一下,温度计也是十七世纪的发明,那时候的人才刚刚开始理解温度的概念,虽然对我们来说这是个很自然的概念

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