Through a study of nearly 1000 pairs of identical and non-identical twins, British and Australian researchers found genes control half the personality traits that make people happy.

英国和澳大利亚科学家通过对将近1000对双胞胎的研究发现，人类的快乐情绪一半是由基因控制的。

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You can see that the rows I add are fairly pointless: I randomly permute a few possible values for each field, which is just enough to make added rows non-identical to each other.

可以看到增加的行毫无意义：为每个字段随机排列了几种可能的值，只要添加的行互不相同就足够了。

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Before then, both identical and non-identical twins have largely independent odds of reaching a given age.

那之前，无论同卵还是异卵双胞胎在达到某一既定年龄时都在极大程度上有各自不同的几率。

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It was more common for identical twins to both have Alzheimer's compared to non-identical, and a statistical analysis of risk rates in the groups gave the researchers their estimate of how significant genetic factors are.

BBC: NEWS | Health | Alzheimer's risk 'is 80% genetic'

If you are a non-identical twin the risk falls to around 10 percent in most studies.

CNN: What are the chances my future kids will be bipolar?

The festival has no parallel in southern Europe, but it's Christmas's non-identical twin: it holds a special place in the national psyche with its own customs, memories and social pressure.

BBC: Here comes the sun in Sweden