Nature has been the greatest chemist of all time, and we are just beginning to understand its secrets.

The man who writes about himself and his own time is the only man who writes about all people and about all time.

采矿技术不是为了取代人，而是为了让他们能够做得更好。

A single seed can change the world.

The power elite is composed of men whose positions enable them to transcend the ordinary environments of ordinary men and women; they are in positions to make decisions having major consequences.

儿童通过自立获得身体的独立；通过自由的使用其选择能力获得意志上的独立；通过没有干扰的独立工作获得思想上的独立。