不要害怕问愚蠢的问题。因为99%的情况下其他人也想问同样的问题，只是因为怕尴尬而羞于提问。

The PAC learning framework provides a formal way to quantify the learnability of a concept class.

I think art is a way of keeping the fear of death at a distance.

创新是将变化视为机会而非威胁的能力。

A proof of a proposition is a process the nature of which is such as to produce in us a belief in that proposition.

Consumer expectations are shifting—businesses must adapt or risk irrelevance.