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Popularity Gene

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Whether you're the life of the party -- or a wallflower -- may partly depend on your genetic make-up.  Researchers at the University of California, San Diego analyzed the social networks of more than a thousand twins.  Some were identical - meaning they had the exact same genes - and others were fraternal.  Social circles were much more similar among the identical twins than the fraternal.  Despite the research, scientists say that personality is also heavily influenced by how you're raised.

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