The fundamental point in fabricating a chain reacting machine is of course to see to it that each fission produces a certain number of neutrons and some of these neutrons will again produce fission.

心灵不是需要填满的容器，而是需要点燃的火炬。

过去不是一个固定的点，而是一个随着每次重述而变化的流动记忆。