When I look at the world I'm pessimistic, but when I look at people I am optimistic.
合作和知识共享对于科学的进步至关重要。
The greatest discovery of my generation is that human beings can alter their lives by altering their attitudes of mind.
History is humanity's collective memory.
To love truth for truth's sake is the principal part of human perfection in this world, and the seed-plot of all other virtues.
质量会被长久记住，而价格很快被遗忘。