我不能教会别人任何事。我只能让他们思考。
让自己振作起来的最好方法是试着让别人振作起来。
化学的艺术在于分离、识别和量化不同物质的能力。
The way in which men produce their means of subsistence depends first of all on the nature of the actual means they find in existence and have to reproduce.
I'm not afraid to die, I'm afraid not to have tried.