What Benjamin Franklin invented?

Miscellaneous - General Knowledge Question and Answer

What Benjamin Franklin invented? 

Bifocal spectacles


Benjamin Franklin is generally credited with the invention of bifocals. Historians have produced some evidence to suggest that others may have come before him in the invention; however, a correspondence between George Whatley and John Fenno, editor of The Gazette of the United States, suggested that Franklin had indeed invented bifocals, and perhaps 50 years earlier than had been originally thought.

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