A fair catch is made by the receiver of either a punt or a kick, so that the receiver may not be interfered with by the kicking of punting team. Once caught, the ball is "dead", i.e., it may not be advanced. This is done to protect a vulnerable receiver that is looking at the ball and not oncoming tacklers. It is also done to prevent the ball from rolling further down field, so that the receiving team does not lose more yardage. Balls that hit the ground usually roll away from the punter or kicker. Generally it is used to limit the loss of more yardage by the receiving team, when the receiver has little chance of advancing the ball.
The origins of American football are linked to rugby, also called football, where the hands are used more often than the feet in terms of controlling possession of a game ball
Offense,Quarterback,Half-Back/Running Back ,Full Back,Offensive Tackle (Left),Offensive Guard (Left) ,Center, Offensive Guard (Right), Offensive Tackle[Right],Wide Receiver(s) Tight End
The bands are worn around the wrist by the referee and are used to keep track of what down it is by placing the loop that is attached to the wristband around the first, 2nd,3rd or 4th finger
The American football field, including end zones, is 360 feet long by 160 feet wide, so the area is 57,600 square feet, which is a little less than one and one third acres
The goal posts in the NFL and college are 18 feet, 6 inches apart. In high school, goal posts are 23 feet, 6 inches apart
Goalposts in American football are 20 feet high, 18 feet 6 inches wide, and have a crossbar 10 feet above the ground
The first rules of American football were devised by folks that ran and played college ball. At a meeting between these colleges in 1876, the crossbar height was set at ten feet.
In American football, a team gets 4 downs to reach either the first down marker or the end zone