在生物圈的地质历史演化中，智慧圈是众多阶段的最后一个阶段。

The most important political challenge of our time is to create strong, effective, and accountable states.

The best way to predict the future of chemistry is to invent it.

受过教育的人与未受过教育的人之间的差异，如同生者与死者之间的差异。