Laughter is a mechanism to bond large groups.
笑是一种连接大群体的机制。
The human brain is a social brain, and it evolved to deal with social relationships.
人类大脑是社交大脑，它的进化是为了处理社会关系。
We are the product of our evolutionary past.
我们是进化历史的产物。
Language evolved to allow us to gossip.
语言的进化是为了让我们能够闲聊。
The magic number 150 suggests that the size of our social networks is limited by the size of our brains.
神奇数字150表明，我们社交网络的规模受限于大脑的容量。