数学不仅仅是关于数字、方程、计算或算法：它是关于理解的。
物理学不仅是一门科学，它是一种思考世界的方式。
We are just an advanced breed of monkeys on a minor planet of a very average star. But we can understand the Universe. That makes us something very special.
Most of what makes a book 'good' is that we are reading it at the right moment for us.
