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地球上任意两个人之间平均要经过多少人才能扯上关系? 1967年,一位英国社会学家为了研究这个问题,在美国中西部进行了一项调查。他随机挑选了300人,要求他们把一个包裹送到一个陌生人那里去。寄送者知
How many people on earth would the average number of people go through to get involved? In 1967, an English sociologist conducted a survey in the Midwestern United States to study this issue. He randomly selected 300 people and asked them to send a parcel to a stranger. Sender know