I was walking down a suburban street seeing other people's children and I stopped to see one in a carriage and I thought it was a sweet child, but I was looking for my child in his face.

VOA : special.2009.06.28

In fact, there's a very famous book called A Random Walk Down Wall Street, that was one of the first to make this hypothesis.

实际上，有一本很著名的书,叫做在华尔街上随机漫步，这本书是最早提出这种假设的先驱者之一。

计算机科学及编程导论课程节选 : 麻省理工公开课