Remember that this molecule, let's look at the blue one wouldn't be the same if I turned it upside down.

让我们记住,如果我把蓝色的,单链倒过来,那么这条链和原来不一样了

耶鲁公开课 - 生物医学工程探索课程节选

After a while, part of you is going to start asking, "Huh, say, it feels the same as it was yesterday, and the day before that and the day before that.

经过一段时间后，你会开始产生置疑，“原来和昨天的感觉一个样，和之前每一天的感觉都一样。

耶鲁公开课 - 死亡课程节选