这些故事不是自传，但它们以那种方式是个人的。我似乎只知道我学到的东西。可能有些东西是通过观察，但我觉得我肯定知道的东西是个人的。
The stories are not autobiographical, but they're personal in that way. I seem to know only the things that I've learned. Probably some things through observation, but what I feel I know surely is personal.
The most important thing in mathematics is to understand the concepts, not just to memorize the formulas.
Every child deserves to see themselves in a story.