The great secret that all old people share is that you really haven't changed in seventy or eighty years. Your body changes, but you don't change at all. And that, of course, causes great confusion.

可归约性的概念对于理解不同计算问题之间的关系至关重要。

光就是一切。它定义形式，创造空间，并赋予画作生命。

天文学的历史是一部视野不断退却的历史。