So basically, the whole society was spending all of the time raising enough food just to support life and there was only 5% left over and that ended up being used in ways like this.

基本上,整个社会全部时间都被用于积累足量食物,这仅是为了维持生计,只剩下5%的时间,被用来建造金字塔,为法老服务

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

So that's what we are going to focus on, and you will find out that the laws of physics for this entire semester certainly can be written on one of those blackboards or even half of those blackboards.

这就是我们的课程重点,而且你将来会发现,整个学期的全部物理定律,最多也只能写满一块黑板,或者半块黑板

耶鲁公开课 - 基础物理课程节选