World's longest running soap opera (72 years)
The world's longest running soap opera, Guiding Light, has been on for 72 years following the lives of four families in America. Starting out as a radio play in 1937 before graduating to CBS daytime TV in 1952, it was funded by Procter & Gamble, which employed Irna Phillips, the "mother of the genre", to write it. In the mid-60s, it was one of the first soaps to feature African-American actors in regular roles. Its fictional "anywhere America" location moved around until 1966, when it settled in a town called Springfield. Kevin Bacon, Calista Flockhart and Mickey Rourke all started out on the show. The show won dozens of awards in its seven-decade span and ran up more than 15,700 episodes, each ending in a cliffhanger.