The PAC learning framework provides a formal way to quantify the learnability of a concept class.

你不必成为最好的，你只需要尽力而为。

Museums are the cemeteries of art.

The true teacher defends his pupils against his own personal influence. He inspires self-trust. He guides their eyes from himself to the spirit that quickens him. He will have no disciple.

我不会让黑暗掩盖我的光芒。

量子非定域性不是关于超光速通信，而是关于关联的结构。