Combinatorics is like the art of counting without actually counting.

习俗并非任何协议或契约的结果，而是长期发展过程的产物，在此过程中它们适应了社会的生活条件。

Memory is not fixed; it’s a skill you can train.

I like to tell a story and not tell the audience what to think about it. I like to just sort of lay it out there and let them decide.

世界充满了故事，但这些故事其实是一个。