过去是一个谜，我们都在试图拼凑它。

A hundred times every day I remind myself that my inner and outer life are based on the labors of other men, living and dead, and that I must exert myself in order to give in the same measure as I have received and am still receiving...

宇宙的扭曲面——黑洞、虫洞、奇点等——是一个谜团，一个挑战我们理解的奥秘。