HN 提问：你的社交网络中，到达 9-11 事件的平均跳数是多少？
2 分•作者: MrCoffee7•14 天前
在您的社交网络中，要联系到一位认识了在 9/11 袭击中遇难者的人，平均需要经过多少次“跳跃”（即中间人）？我特别想知道，这个答案会因社交网络图中第一个人的年龄而有何不同？
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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?