"He was the father of one of the most important scientific theories of all time, but Charles Darwin also turned his formidable intellect to a less weighty question – do blondes have more fun?
Letters uncovered as part of a major project to compile Darwin's correspondence have revealed that the great Victorian naturalist devoted part of his time to examining whether hair colour affects a woman's ability to find a mate.
He set out to investigate a theory that the prevalence of dark hair in the general population was increasing because brunettes were more likely to get married and have dark-haired offspring, while blondes tended to stay single and childless.
To further his research, he asked a doctor at Bristol Royal Infirmary to compile and send him data on the hair colour of married and single female patients at the hospital.
The investigation took place a decade after the publication of The Origin of Species, Darwin's tome of 1859 which led to the theory of evolution."
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