The choices we make in our 20s are the foundation for the lives we will lead.
Happiness and unhappiness depend upon the opinion we have of things.
The best way to predict the future is to create it.
To do mathematics is to explore a universe of ideas, where the only limit is your imagination.
你读得越多,知道的东西就越多。你学得越多,去的地方就越多。
Every new planet we find is a step closer to answering the age-old question: Are we alone in the universe?