Today is cruel, tomorrow is crueler, and the day after tomorrow is beautiful, but most people will die tomorrow night.

The interplay between theory and observation is what advances astrophysics.

We often think of poverty as a lack of money, but it’s also a lack of information and opportunities.

现代化学家不满足于仅仅成为化合物的制造者；他必须是自然的解释者。

自由在于做自己所愿。