我是一个非常积极的思想家，我认为这是我在困难时刻最能帮助我的东西。
I’m a very positive thinker, and I think that is what helps me the most in difficult moments.
科学是通过证据追求真理。
Sometimes it seems as if there are more solutions than problems. On closer scrutiny, it turns out that many of today's problems are a result of yesterday's solutions.
我们能留下的最伟大遗产是为后代留下一个更健康的星球。