Change is uncomfortable, but stagnation is fatal.

"La muerte no existe, la gente sólo muere cuando la olvidan; si puedes recordarme, siempre estaré contigo."

Education is the most powerful weapon which you can use to change the world.

Mathematics is not just about numbers, equations, computations, or algorithms: it is about understanding.

可持续性不是一种选择，而是我们对后代的责任。

自然实验是理解现实世界中因果关系的强大工具。