profootballhof.com

v1JLK TIL that the "Heidi Game" refers to when NBC prematurely cut away from their broadcast of a 1968 US pro football game to show the film Heidi; in the game's final seconds, the Raiders scored two touchdowns to beat the Jets. The TV audience had no idea about the surprise outcome.
Z8bEY TIL That on September 27th, 1920 the American Professional Football Association (APFA) was founded in Canton. This league would later change its name to the National Football League.