Researchers believe that a single gene found in a third of Americans could cause sloppy driving. Undergraduates who possessed the gene, which affects the brain's ability to rewire itself and thus its ability to learn new skills, made 20% more mistakes during a driving simulation than their more genetically fortunate peers. "The people who had this genetic variation performed more poorly from the get-go," says neurologist Steven Cramer. "It's up to society to say, how do we deal with that fact?"

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