"Randomized experiments are the gold standard for causal inference, but they are not always feasible."

投资农民教育能带来最高的回报。

"I'm like a kid. I never think about the consequences."

Sustainability is not an option; it's a responsibility we owe to future generations.

The human being is a sun, and the senses are his planets.

建筑的强度不仅在于其材料，还在于使用它的人的精神。