How do you tell who your kin are?

你怎么知道谁才是有血缘关系的呢
And this actually turns out to be a really interesting question.

这事实上是个非常有趣的问题
It used--And some research suggests that the answer is simple.

一些研究结果表明答案很简单
You avoid sex with people you grew up with.

你不想和你一起长大的人做爱
And these studies actually come from kibbutz studies,

这个研究来自基布兹(以色列集体农场)
studies where people are raised communally on an Israeli kibbutz.

研究在基布兹一起长大的人们
They know they're not related,

他们知道互相之间是没有血缘关系
but still,

但同样
the fact that they were raised together as kids suggests that

他们从小一起长大说明
there's a cue at a gut level

这会在内心深处产生一个信号
not to be attracted to one another.

示意他们不应该被彼此吸引
It turns out there's some reason now to believe this story

而现在又有理由证明这个故事