Charles Darwin investigated whether blondes have more fun

"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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