"Randomized experiments are the gold standard for causal inference, but they are not always feasible."
我信奉老派作风——写经得起时间考验的歌。
这个行业最优秀的领导者既了解土地,也了解在这片土地上工作的人。
The dead are visible only in the terrible lidless eyes of memory.
Creativity requires the courage to let go of certainties.