漆黑的sustain_sustained_sustain 84(11)

Thats my social experience。" But now we, with a birds eye view looking at this network, can see that they occupy very different social worlds。 And I can cultivate that intuition in you by just asking you: Who would you rather be if a deadly germ was spreading through the network? Would you rather be C or D? Youd rather be D, on the edge of the network。 And now who would you rather be if a juicy piece of gossip -- not about you -- was spreading through the network? (Laughter) Now, you would rather be C。

把左上角的点B和左下角的点A做比较。他俩都有四个朋友，但是A的朋友们彼此相知，B的朋友们却不是。所以A的一个朋友的朋友，反过来还是A的朋友，而B的一个朋友的朋友倒不一定是B的朋友，而是在网络中的更远处。这就是网络中的可传递性。最后再来比较点C和点D，两者都有六个朋友，如果你问他们：“你的社交生活怎样？”他们会说：“我有六个朋友。这就是我的社交经历。”但我们来鸟瞰这个网络，我们就会发现他们的社交圈是完全不同的。接下来的这个问题就可以培养你这方面的直觉：如果一种致命的病毒在这个网络里得以扩散， 你希望你是其中的哪一位？你是想当C还是想当D？你当然是想当D，处在网络的边缘。如果一条跟你无关的八卦新闻在这个网络里散播，你又会想当谁呢？这次你会想当C。

So different structural locations have different implications for your life。 And, in fact, when we did some experiments looking at this, what we found is that 46 percent of the variation in how many friends you have is explained by your genes。 And this is not surprising。 We know that some people are born shy and some are born gregarious。 Thats obvious。 But we also found some non-obvious things。 For instance, 47 percent in the variation in whether your friends know each other is attributable to your genes。

Whether your friends know each other has not just to do with their genes, but with yours。 And we think the reason for this is that some people like to introduce their friends to each other -- you know who you are -- and others of you keep them apart and dont introduce your friends to each other。 And so some people knit together the networks around them, creating a kind of dense web of ties in which theyre comfortably embedded。 And finally, we even found that 30 percent of the variation in whether or not people are in the middle or on the edge of the network can also be attributed to their genes。 So whether you find yourself in the middle or on the edge is also partially heritable。

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