Vikings fans, no doubt, remember it like it was yesterday: a 10-3 win over the Packers in Week 10 of the 1970 regular season.
No? Maybe they should have savored the moment -- because according to one measure, it's been all downhill from there.
The stats-centric folks over at FiveThirtyEight crunched the numbers on the complete history of every NFL team. They used a method known as Elo ratings, a measure of team strength that accounts for basic factors like margin of victory, home-field advantage and quality of opponents.