If you're interested in what BMJ editors do when they are out and about, there's a new blog on bmj.com (http://blogs.bmj.com/bmj/category/comment/editors-at-large). It gives a flavour of some of the conferences we've been at and some of the people we've met: the eponymous Dr Kawasaki for one, UK public health grandee Rod Griffiths for another. I met Rod at a conference in Athens and we got talking about fluoride. No one in their right mind would get involved in the debate about water fluoridation, he said. It's a minefield. But this week we do get involved, and against his better judgment, so …