Those that know me won't be surprised to hear I have been busy arguing with anti vaxers lately. I tend to get passionate about things. Anyway in the process of site hopping you come across some wonderfully bright people, and some fantastic links. Here is a great link that helps in some way explain the frustrating phenomenon of those who refuse to believe black and white facts, even when you are slapping their face with them. Metaphorically speaking of course. Anyway enjoy.