If you're not stubborn， you'll give up on experiments too soon. And if you're not flexible， you'll pound your head against the wall and you won't see a different solution to a problem you're trying to solve.

在原子和电子的世界中，经典物理学的定律不再有效，我们必须转向量子力学以获得正确的描述。

恐惧是底片显影的暗房。