Related HowStuffWorks Articles
- Football Quiz
- How Fantasy Football Works
- How the NFL Draft Works
- How NFL Equipment Works
- How the Physics of Football Works
- How the First-Down Line Works
- How does the NFL's salary cap work?
More Great Links
- Official NFL Web site
- CBS SportsLine.com: NFL Official Signals
- Wilson Sporting Goods: The Making of a Football
- The Straight Dope: Why is a football called a pigskin?
- NFL Digest of Rules