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Twin-Sanity!

"Twin studies are pretty much useless," says Slate's Brian Palmer. The idea of using twins to track heritability is an old one, but critics say the idea is worn out and can lead to potentially ambiguous conclusions about how genes are inherited and how they affect a person compared to the person's environment. Despite numerous indications that conclusions drawn from twin studies are "deeply flawed," researchers continue to do these studies and write papers based on the results, Palmer says.

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