CNN: Dynamic duos: Why science loves twins

One of the broadest studies of twins in the United States suggests that our genes tend to influence the diseases that afflict us more than where we live, according to research published Monday in the journal Nature Genetics.

Using insurance claims data, researchers identified more than 56,000 pairs of twins and estimated the heritability of 560 diseases, finding that nearly a third of the variation in these conditions could be attributed to genetics, on average. Where people grew up was less contributory on the whole.

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