Data is the oil of the new era, but more valuable than oil.
Every act of communication is a kind of performance.
人们还往往把真理和错误混在一起去教人，而坚持的却是错误。
Man is born free， and everywhere he is in chains.
The past is never dead. It's not even past.
To teach how to live without certainty and yet without being paralyzed by hesitation is perhaps the chief thing that philosophy， in our age， can do for those who study it.
Every problem in NP can be reduced to the satisfiability problem, which is the cornerstone of computational complexity theory.