Millions saw the apple fall, but Newton asked why.

数学不仅仅是关于数字、方程、计算或算法：它是关于理解的。

The meaning of a sentence is not just in the words themselves， but also in the illocutionary act it performs.

Humans are allergic to change. They love to say, 'We've always done it this way.' I try to fight that. That's why I have a clock on my wall that runs counter-clockwise.

解释：不可以不知道活着的乐趣，也不可以不知道虚度光阴的担忧。