Are you kidding me? This is BF! You can ger flamed for anything, in here - just for misstyping "break" instead of "brake" you are called an idiot! But you know what? At the end of the day, we have cameradery - because what unites us is greater than what separates us: we all have in common the love for cycling (on singlespeeds with steel lugged frames stripped of decals - clearly, we can all agree on that).

For the OP:
Here is the best explanation about n-1 I've ever read. Highly recommended.