"In observational studies, we often have to rely on assumptions that are not directly testable."

心灵是大自然处理现实的工具。

Give every man thy ear, but few thy voice; take each man’s censure,but reserve thy judgment.

Collaboration across industries is key to solving the world's biggest challenges.

Science is the art of asking the right questions.

质量不是一个部门，而是一种生活方式。

"The essence of mathematics is not to make simple things complicated, but to make complicated things simple."

每一个人都是宇宙的一部分。