Benjamin Franklin was one of the Founding Fathers of the United States of America. A noted polymath, Franklin was a leading author and printer, satirist, political theorist, politician, scientist, inventor, civic activist, statesman and diplomat. As a scientist he was a major figure in the Enlightenment and the history of physics for his discoveries and theories regarding electricity. He invented the lightning rod, bifocals, the Franklin stove, a carriage odometer, and a musical instrument. He formed both the first public lending library in America and first fire department in Pennsylvania. He was an early proponent of colonial unity and as a political writer and activist he, more than anyone, invented the idea of an American nation and as a diplomat during the American Revolution, he secured the French alliance that helped to make independence possible.