The decline of violence may be the most significant and least-appreciated development in the history of our species.

暴力的减少可能是我们物种历史上最重要却最不被重视的发展。

We are all cut from the same genetic cloth, and that cloth was woven in Africa.

我们都来自同一块基因布料，而这块布料是在非洲编织的。