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.
最伟大的事件并非总是最重要的。
"History is not the past. It is the method we have evolved of organizing our ignorance of the past."
历史不是过去。它是我们进化出来的组织我们对过去无知的方法。
Every challenge is an opportunity to grow.
