OT - College B-Ball rankings

Time for me to vent......
Anybody who is versed in NCAA b-ball? Please tell me how Wake jumps over Duke in the rankings when Duke didn't lose this week? Pitt was #1(they then lost to L-ville), Duke was #2(beat G-Town), Wake Forest was #3(they beat Clemson) and then jumped over Duke in the rankings to the vacated #1 spot which Pitt had. Now granted Wake is undefeated, and Duke has 1 loss. BUT, Duke has had one loss for about 6 weeks and was ahead of Wake just as long. What changed?
Rankings for last week:
http://sports.espn.go.com/ncb/rankings?pollId=2&seasonYear=2009&weekNumber=10&seasonType=2
Rankings this week:
http://sports.espn.go.com/ncb/rankings?pollId=2&seasonYear=2009&weekNumber=11&seasonType=2
Anybody who is versed in NCAA b-ball? Please tell me how Wake jumps over Duke in the rankings when Duke didn't lose this week? Pitt was #1(they then lost to L-ville), Duke was #2(beat G-Town), Wake Forest was #3(they beat Clemson) and then jumped over Duke in the rankings to the vacated #1 spot which Pitt had. Now granted Wake is undefeated, and Duke has 1 loss. BUT, Duke has had one loss for about 6 weeks and was ahead of Wake just as long. What changed?
Rankings for last week:
http://sports.espn.go.com/ncb/rankings?pollId=2&seasonYear=2009&weekNumber=10&seasonType=2
Rankings this week:
http://sports.espn.go.com/ncb/rankings?pollId=2&seasonYear=2009&weekNumber=11&seasonType=2