科学的进步不仅是通过回答问题，而是通过提出更好的问题。

I define nothing. Not beauty, not patriotism. I take each as it comes, and I leave it as it goes.

The act of writing is an act of optimism. You would not take the trouble to do it if you felt it didn't matter.

若是有足够的空间，婴儿会爬行去抓取东西。