世界上最好和最美丽的东西是看不见甚至摸不着的——它们必须用心去感受。
When we no longer have the power to change a situation, we are challenged to change ourselves.
I was neat, clean, shaved and sober, and I didn't care who knew it.
A proof that P = NP would have profound implications for mathematics, cryptography, and algorithm design.