一个测量可用的常识：手臂伸直两测指尖的距离就是你的身高。

过去总是在倾听，等待我们转身，以便在我们耳边低语。

最大的智慧是认识到自己的无知。

The end of history will be a very sad time. The struggle for recognition, the willingness to risk one's life for a purely abstract goal, the worldwide ideological struggle that called forth daring, courage, imagination, and idealism, will be replaced by economic calculation, the endless solving of technical problems, environmental concerns, and the satisfaction of sophisticated consumer demands.

科学不仅仅是发现，更是理解和连接各个点。