On this day, April 17, 1790, the son of a poor candle maker died. The 15th of 17 children, he apprenticed as a printer and published a popular almanac. He retired at age 42, then taught himself five languages, invented the rocking chair, bifocal glasses and the lighting rod, which earned him degrees from Harvard and Yale. He helped found the University of Pennsylvania, a hospital, and America's first postal system and fire department. He became the governor of Pennsylvania, signed the Declaration of Independence and called for prayer at the Constitutional Convention. He was also president of America's first anti-slavery society. His name was Ben Franklin. In his Poor Richard's Almanac (May 1757), Ben Franklin wrote: "Work as if you were to live 100 years; pray as if you were to die tomorrow."