An interesting fact:
If you have AA, you would rather go up against a KK than a 77.
The odds of hitting a set are the same, but with the 7's more straight oppurtunities are open:
3-4-5-6-7 all the way through to 7-8-9-10-J.
Aces against any hand is at least a 4:1 favorite PREFLOP!!!