There are only molecules. Everything else is sociology.

"Every revolution begins with a single thought that refuses to be silenced."

科学不是凭经验行事。

For the eyes of the world now look into space, to the moon and to the planets beyond, and we have vowed that we shall not see it governed by a hostile flag of conquest, but by a banner of freedom and peace.

徒步旅行的真正魅力不在于看到物体，而在于它们激发的情感。