Every problem in mathematics is an opportunity to learn something new.
Coal will remain a vital energy source, but only if we evolve with the times.
股市是一个将资金从急躁者转移到耐心者的工具。
The most important thing is to enjoy your life—to be happy—it's all that matters.
宇宙的周期性变化源于爱和争斗的相互支配。