杰夫·贝索斯接受了莱克斯·弗里德曼的播客采访
海洋浩瀚,但我们的责任更大。
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.
大脑是一个复杂而动态的系统,理解它需要多学科的方法。