1) Special teams - when there's a punt or a kick, do the players that come on ONLY come on the field for this point in the game? For instance, do NFL teams have a guy whose job it is ONLY to punt the ball, his entire career is coming on to catch a ball and boot it miles upfield? Obviously I know the guys who kick for extra points and field goals are specialists, but what about the centre who snaps it back a long way for the kicker, and the guy who catches the ball for the kicker? Do they ONLY do that job as well? If so, how do you get into doing that

Also, is the guy who returns the punts a wide receiver when the team is on offence, or does he just do that job?
2) Do any players play multiple positions? Are there guys at the line of scrimmage who sometimes play on offence or defence? I remember that guy who played for dallas a few years back, dion sanders I think, who used to play as a wide receiver but also did some defence stuff too (cornerback)?
3) How many quarterbacks does a team have? Presumably as it's so specialised and important there'd be a large number of them to cover for injuries. Has there ever been a case where a player from another position has come in to play quarterback due to an injury crisis?
4) What stats tell you who is a better kicker? Other than just kick success percentage? Because I guess if you're on a good team, you'll kick a lot of extra points (easy) and not too many 80-yard fieldgoals and so your percentage would be higher, is there a stat that takes that into account?
5) I know each quarter is (I think) 15 mins, but sometimes the clock is running when the scrimmage is lining up, and sometimes it's stopped. I know it stops when someone runs the ball into touch, but other than that what determines if the clock is stopped or not?
6) You can only pass the ball forwards once, right, but what about backwards? Has nobody tried some technique such as throwing it to a receiver, and having a supporting player running drag behind them so the guy on the ball ships it back if he gets tackled, rugby style?
7) I know that teams on defense have a front line, and then linebackers behind who try to burst through and sack the QB. How do they decide whether to have 4 at the front and 3 at the back, or vice versa? Obviously the quarterbakc controls the offence, but who is the team leader on the defence, or are they more or less just reacting to what the offence do individually?
8) how is the draft order determined in the NFL? Much the same as MBL and NBA?
9) This is only the 40th superbowl - what did they play for before that?
10) it's the Vince Lombardi trophy - he was an old manager of Green Bay, right? Was there a trophy before that, and when (and why) did it become the Lombardi trophy?
Thanks, Yanks!
Monk