量子场论的发展表明，真空不是空的，而是充满了虚粒子。

银河系的黑洞是我们研究极端引力的最近实验室。

Your work begins, work that will not be always joyful to you, labor that may not always fulfill you and days that will seem like one damn thing after the other.

You have to be willing to sacrifice, to put in the time and effort.

You have to believe in yourself when no one else does.