From the September issue of The Rotarian, here is an interesting little tidbit from In Brief:

Your genes
 may be responsible - at least in part - for how nice you are, according to the "The Neurogenics of Niceness," a study in the April issue of Psychological Science.  Researchers found that people who viewed the world as a threatening place were less likely than those with positive perceptions to help others - unless they had the "nice" versions of oxytocin and vasopressin receptors.  Genes determine which version a person has.

So, hmmm. Nibble on that one and ponder what hand you were dealt...Actually, I think our club members were born with the right jeans on...er, genes in 'em.