The brain caps off its second and last growth spurt in your 20s as it rewires itself for adulthood.

如果你没有失败，说明你不够努力。

The end of history will be a very sad time. The struggle for recognition, the willingness to risk one's life for a purely abstract goal, the worldwide ideological struggle that called forth daring, courage, imagination, and idealism, will be replaced by economic calculation, the endless solving of technical problems, environmental concerns, and the satisfaction of sophisticated consumer demands.

听听他们的言论，看看他们的实际行为，考察他们的能力，谨慎的授予官职。

Mathematics is a creative endeavor, just like art or music.