The truth is, the science of Nature has been already too long made only a work of the brain and the fancy: It is now high time that it should return to the plainness and soundness of observations on material and obvious things.
物理定律是普适的，在像银河系中心这样的极端环境中测试它们是至关重要的。
I would like to paint the way a bird sings.
"We live in a world where the past is always present, and the future is always uncertain."
The best mathematics is not just rigorous; it is also elegant.