Re: Almost no education
"what's the intersect between teachers and elReg readers and what's the probability of finding a member of it in any given school?"'
As a sample-of-one testimonial, I'd say there is one ElReg reading educator in an area the size of The San Francisco Bay Area (I'm the only one I've met, ~8 million residents, not certain how many schools there are, several thousand anyway. Note that I don't teach K-12 anymore. Also note that I only teach IT related subjects; I'm more geared to the vocational than the academic).
Totally useless statistically, but it's a start.