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You may want to think twice before making one of those "dumb blonde" jokes...
A new study out of Stanford University found there is no link between hair color and intelligence and personality. The study found that golden locks are the result of just a single letter of genetic code, meaning one letter can determine if you are blonde or brunette. No correlation between a person's intelligence and hair color was found.
The study also suggests eye color and hair color are not genetically related, meaning the coveted blonde hair-blue eyes combo are not genetically linked.
To read more on the study, check out the National Geographic article here.