问HN：在你的社交网络中，平均需要多少步才能联系到9-11事件的死者？
在你的社交网络中，平均需要多少步才能联系到一个认识在911袭击中遇害者的人？我特别想了解这个答案如何根据社交网络中第一个人的年龄而有所不同。
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What is the average number of hops in your social network to someone living who knew someone who was killed in the 9-11 attack? I am particularly interested in how the answer would vary depending on the age of the first person in the social network graph?