对我们星球的最大威胁是相信别人会拯救它。

计算理论不仅仅是关于解决问题，还涉及理解可计算性的极限。

People with a sense of fulfillment think it a good world and would like to conserve it as it is, while the frustrated favor radical change.

生命太短暂，不要在早晨醒来时带着遗憾。