If you attend a Super Bowl party on Sunday, you’ll probably hear at least one casual football viewer ask, “How do they get that yellow first-down line on the field?”

FOOTBALL
The Birds have one of the NFL's most interesting histories, not to mention a connection to the 'Star Wars' universe.
Love ‘em or hate ‘em, there’s no denying that the New England Patriots have established a dynasty of truly historic proportions.
Here are the stories behind the nicknames of the NFL’s 32 teams—and what they were almost called. All photos via Getty Images.
The 1980s NFL alternative became so cash-strapped that athletes had to ride school buses to practice.
Television coverage of games can last hours, but the ball can actually be in play for as little as 11 minutes in a given game.
Though what would become known as the NFL was formed on August 20, 1920, the roots of American-style football date back well over a century.
According to the owner, the NFL refuses to buy it.
There are no elephants in Alabama. What gives?
Spoiler: Some trophies end up in closets or at the homes of the players' parents.
Professional football players once made $100 a game. When "Red" Grange's agent was done, Grange walked off with $100,000.
In the 1990s, the magazine industry was having some issues. 'People' suffered a five percent drop in circulation in the first half of 1990; 'Sports Illustrated' dropped by seven percent that same year.
Are you ready for some football? How about a trip down musical memory lane to rediscover the many Monday Night Football theme songs?
In the 1890s, Paul D. Hubbard—the Deaf quarterback for Gallaudet University's football team—had his offense form a tight circle so that they could discuss plays without the other team seeing what they were signing
In 1942, the Rose Bowl game between Oregon State and Duke was transferred from California to North Carolina in the wake of the attack on Pearl Harbor. Here’s a brief look back at one of the greatest upsets in Rose Bowl history.
Unfortunately, the first athlete to playfully slap a teammate on the butt didn’t record his reasoning for history, but it’s become common practice among professionals and amateurs alike, and many have their own take on it.