Dunbar has found that the human brain has evolved in a way that means we can only give real attention to a particular number of people.
邓巴发现，人类大脑的进化方式使我们只能真正关注到特定数量的人。
In fact, 150 is "the average number of people to whom most of you send Christmas CARDS," Dunbar says.
事实上，“150张圣诞节卡片，这是你发卡片的人的平均数”。登巴说。
BOB DOUGHTY: Professor Dunbar found that the people who had laughed loudly and long could take up to ten percent more pain than the others.
邓巴教授发现那些长时间开怀大笑的人能够比其他人多了百分之十的疼痛忍受力。
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