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The American Professional Football Association was formed in 1920, the league later changed it's name to the the National Football League in 1922.
Before 1974 goal posts were flush with the goal line. Goal posts were moved to end of the goal line in 1974 to reduce the risk of injuries to players.
In professional football the home team is required to provide 36 footballs for outdoor games and 24 footballs for indoor games. Each ball must be available for pressure testing by the refrees two hours before the start of the game.
The dimensions of a standard football field are 360 feet long by 160 feet wide.
The term "pigskin" comes from the early days of football when materials such as pigs' bladders were used. Footballs today are made from tanned leather that help players grip the ball.
