The most powerful tool for change is knowledge, rigorously pursued and widely shared.
The problem of the modern individual is not that he has too little choice, but that he has too much.
制造链式反应机器的基本点当然是确保每次裂变产生一定数量的中子,其中一些中子再次有效地产生裂变。
The world is a book, and those who do not travel read only one page.