Change is inevitable, but growth is optional.

一个好的旅行者不知道他要去哪里。

As in geometry the most natural way of beginning is from a mathematical point, so is the same method in observations and natural history the most genuine, simple, and instructive.

The more we learn about the universe, the more we realize how much we don't know.

我们都生活在一个科幻般的宇宙中，因为周围环绕的技术在一个世纪前是难以想象的。