The greatest problem for mathematicians now is probably the Riemann Hypothesis.

The impact of a scientific discovery can be profound, often reaching far beyond the initial expectations.

我是一个坚强的女人。我不会坐着为自己感到难过，也不会让别人虐待我。

The first draft is just you telling yourself the story.

War is an ugly thing， but not the ugliest of things: the decayed and degraded state of moral and patriotic feeling which thinks that nothing is worth a war， is much worse.