For some reason I let myself become embroiled in an antivax discussion on G+ over the weekend. I posted some historical data about vaccines and disease, corrected some misconceptions about how the immune system works (of which there were many), talked about balancing of harms, and so on. Sadly, it made no difference. People posted the same things in response, repeatedly, even though those points had already been addressed. Perhaps most disturbingly, people finally took the position that all of my historical and medical data was somehow the product of some vast vaccine-industrial-complex conspiracy. How do you even address that. The idea that there is some secret conspiracy no one has information about can't be disproven. Every fact is assumed by the dolt you're arguing with to be another example of the conspiracy. Do we need to teach more critical thinking in schools, or what?