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. That's 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 don't 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 they're 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.
所以不同的结构点对你的人生有着不同的影响。事实上,我们的实验结果表明,朋友数量的差异有46%都是可以通过基因得以解释。这并不奇怪。因为我们知道,有的人生来腼腆,有的人生来合群。这是显而易见的。但我们也发现了一些不是那么明显的东西。比如,你的朋友们是否认识彼此,其中47%的差异都是和你的基因有关。你的朋友们是否认识彼此不仅仅和他们自己的基因有关,也和你的基因有关。我们认为其中的原因就在于有的人喜欢把自己的朋友介绍给彼此──没错,说的就是你──而其他人喜欢把朋友们分开,不喜欢介绍给彼此。所以有些人将他们身边的网络们编织在一起,构成了紧密相联的深层网络,而他们则是舒服地身处其中。最后,我们甚至发现人们是身处网络中心还是边缘,30%的差异也是和他们的基因相关。所以你是在中心还是边缘,有一部分是遗传的。
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