When an object is lost， 95% of the time it is hiding within arm’s reach of where it was last seen. Search in all possible locations in that radius and you’ll find it.

写得越多，越发现自己无知。

在数学中，最深刻的思想往往源于最简单的观察。

Science progresses not just by answering questions, but by asking better ones.

光明在书中。把书完全打开，让它发光，让它发挥作用。