Every problem in mathematics is a puzzle waiting to be solved, and the joy is in the solving.
The wild is a place of extremes. To survive, you have to find balance.
尽管困难,但约束自己去做你知道是正确和重要的事情,是通往自豪、自尊和个人满足的大道。
The bigger the brain, the more complex the social world it can manage.