As an experiment, I've enabled AdSense on my blog (not that I'm anticipating major revenue nor indeed any particular increase in traffic, but just in case).
I note that half my ads so far (out of a microscopic sample size, a phrase including the words "fingers", "hands" and "both" springs to mind) are for unproven parenting products and untested (or tested-and-found-wanting) therapeutic materials for children with disabilities. I sense some bloggy material... let me just add a draft post along the lines of "dodgy therapies and why parents fall for them".