因果模型是理解世界的关键。
The causal model is the key to making sense of the world.
The past is never dead. It's not even past.
未来属于科学——属于那些敢于探索的人。
数学中真正的挑战不是解决问题,而是提出正确的问题。
健康不是富人的特权,却是穷人的脆弱点。
I'm not going to let anyone bring me down.