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.

You do not have to be good. You do not have to walk on your knees for a hundred miles through the desert, repenting. You only have to let the soft animal of your body love what it loves.

【释义】凯根打破童年决定论：快乐童年未必护航成年，而经历过黑暗的孩子反而可能锻造韧性。

The search for truth is more precious than its possession.