The walls of a garden should be high enough to keep the world out, but low enough to let the sky in.

现代物理学的挑战不仅在于找到答案，还在于提出正确的问题。

解释：愚者最大的弊病，就是误把聪明人当糊涂人糊弄。

If you want to understand a system, try changing it.

The digital revolution is far more significant than the invention of writing or even of printing.

The value and utility of any experiment are determined by the fitness of the material to the purpose for which it is used.