I realise that now - too late to save myself my being cast out as a troll pretending to be a scientist. Whatever folk think, I was not trying to start a war, just a chat about a subject that can't just be a chat!

Anyway, I'm off to friendlier climes. Like someone said, I'm probably too thin skinned!

I will just leave you with this literature review.
http://www.cyclehelmets.org/1052.html