Never let age be a barrier to learning or discovery.

Sometimes we get sad about things and we don’t like to tell other people that we are sad about them.

数学的真正力量在于它能够揭示宇宙混沌中隐藏的模式和结构。

大西洋两岸大陆的契合，是大陆漂移理论最引人注目且最关键的验证。

Should you find yourself contorting to fit a system, dear reader, stop and ask if it's truly you that must change or the system.

You should write, first of all, to please yourself. You shouldn't care a damn about anybody else at all.