Almost everyone I know has something special they're interested in, something they care about. Perhaps they call it their hobby or passion, it could be their pets, music, politics or something more unusual but whatever it is I'll refer to it as their "special interest". While it is important to them it will usually be irrelevant to their friends, family, colleagues and the general population. I will explore by example what I find interesting about these special interests, how exclusive they can be and their effects on society.
