Every life leaves behind a trail of evidence; the biographer is the detective who follows it.

The key to success is to get out into the store and listen to what the associates have to say. It's terribly important for everyone to get involved. The best ideas come from the floor.

最危险的武器不是杀人的武器，而是改变思想的武器。

人性的弱点总是充满贪婪、恐惧或者是愚蠢，这是完全可以预测的，但是我们无法预测这种人性弱点的发生顺序。

The concept of polynomial-time reduction is central to understanding the structure of NP-complete problems.