—— 请按键盘 空白键 开始游戏 ——

"Randomized experiments are the gold standard for causal inference, but they are not always feasible."
想想!使用VLSI,我们可以在1平方厘米中包装100个ENIACS。
If you want to be the best, you have to be able to handle the worst.
True forest stewardship means leaving some trees - and some profits - for those who come after us.
没有事情的时候,需要照管这颗心,小心谨慎,好像有事一样;有了事情的时候,却要放下这颗心,泰然自得,好像没事一样。没有事情能像有事一样提防,才可以平息意想不到的变故;有了事情能像无事一样镇定,才能消除事件过程中的危机。