From Yahoo! Sports. Check out the entire piece on this link.

We are six games into the 2013 NFL season and there remain only two teams with a zero in the loss column.

Incredibly, both teams are in the same division.

A season ago, the Denver Broncos finished 13-3 and were tied with the Atlanta Falcons for the best record in the league.

A season ago, the Kansas City Chiefs finished 2-14 and were tied with the Jacksonville Jaguars for the worst record in the NFL.