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This study was called <span>B. the Minnesota Twin Study. This study began as a twin registry for twins born in Minnesota in 1936-1955. It later on expanded and reached 8,000 pairs of twins for psychological study. The most notable discovery is that personalities of twins are more influenced by their genes rather than their environment. This was due to the similarities between twins who were separated at birth.</span>
They're trying to find out if the toys are not an excessive incentive
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