They may be not on the national radar For me, in my own life, when I think of real heroes or even role models, or well-known people in the Patheon of struggle.

有哪些是你觉得人们需要了解的？,对于我来说，当我想到真正的英雄或者榜样时，或者先贤祠中的名人。

普林斯顿公开课 - 人性课程节选

It is true mathematically, you can add two numbers, but you've got to ask yourself,"What am I doing as a physicist when I add these two numbers?"

在数学上它是正确的,你可以引入这两个常数,但是你需要问问自己,当我引入这两个常数时,这么做有什么物理意义

耶鲁公开课 - 基础物理课程节选