Never stop learning because the world never stops changing.

物理学的美丽在于它能够揭示宇宙表面复杂性之下的深刻简单性。

Human kindness has never weakened the stamina or softened the fiber of a free people. A nation does not have to be cruel to be tough.

"All true stories are about the meeting of opposites."

I'm not a perfect person. I never claimed to be.

Every piece of fruit tells a story—of the land, the labor, and the love that went into growing it.

I believe that we should all follow our passions and do what makes us happy.

粒子的概念只是近似的，并且只有在动量较小的极限下才有意义。