Benjamin Franklin arrived in Philadelphia in 1723 without a single coin to his pocket. By 1748, he became extremely wealthy by owning a print shop and publishing his popular book Poor Richard’s Almanack. Franklin made so much money by his early 40s that he spent half his life in unofficial retirement. This allowed him time to learn and experiment with a number of inventions including bifocal glasses and the lightning rod. Eventually, he dedicated a lot of his time to public service becoming one of the most celebrated American founding fathers.