Stanley Milgram from the '60s and '70s, the creator of the small-world experiments, which became later popularized as six degrees of separation, made the point that any two arbitrarily selected people were likely connected from between five to seven intermediary steps.
上世纪60到70年代的斯坦利·米尔格兰姆（美国著名社会心理学家） “小世界现象”实验的创造者， 这个实验就是以后著名的“六度分离”理论， 意思就是任何两个人 都会在5到7人之间建立起联系。