There's a tendency to think that our present politicians are much worse than we had in the past.But we tend to forget how awful our politicians were in the past.
每座建筑都是一个原型。没有两座是相同的。
"If you want to fly, you have to give up what weighs you down."
A problem is in P if it can be solved quickly by a computer, and in NP if a solution can be verified quickly.
"Pressure is a privilege—it means you have an opportunity to do something great."