Keeping up with football's hard-hitting facts can be as challenging as scoring against a tough defense. You need to take in long distances (the longest field goal in NFL history was 64 yards), huge sizes (the average NFL offensive lineman in 2013 weighed 310 pounds), and incredible details (fans at football games can be loud enough to cause earthquakes). Infographics make essential concepts about football easy to absorb--from how to throw a spiral...