Maybe you didn't pay close enough attention during the preseason to notice and those yellowish 50-yard line numerals on Sunday perplexed you to wits' end.
In case you haven't Googled it or asked that one friend who always knows these sorts of things, here's the deal: in celebration of Super Bowl 50 -- the golden anniversary year -- the NFL has had those numerals painted gold at midfield in each NFL stadium.
The league's planned a number of other events, too, such as honoring the 43 Super Bowl MVPs throughout the season.