"Randomized experiments are the gold standard for causal inference, but they are not always feasible."
Scientific rigor must never be compromised by commercial pressures.
In mathematics, you don't understand things. You just get used to them.
We are all in the gutter, but some of us are looking at the stars.
Next time, leave a little earlier. Your son is pleading for you
對天資在中等程度以上的人，可以和他談?wù)摳呱畹膶W(xué)問；而對于中等以下天資的人，則不可以和他談?wù)摳呱畹膶W(xué)問。
The pursuit of happiness is not just about seeking pleasure, but also about finding meaning and purpose in life.