生活的全部秘诀在于对一件事深感兴趣，对一千件事都感兴趣。
The whole secret of life is to be interested in one thing profoundly and in a thousand things well.
I have now taken a serious task upon myself and I fear a greater one than is in the power of any man to perform.
The poor are not irrational; they are just as rational as anyone else, but they operate under very different constraints.
Inflation is the mechanism that can make the universe flat, homogeneous, and isotropic.