In my meandering career from academia to government to private sector, and back into all the grey areas in between, I've been an author on a few journal articles, government reports, and other publications. Usually, these are collaborations between groups of separated people, not all of whom interact with every other member of the team. For example, in the academic literature, I have a total of 21 co-authors, of whom I have met 9. If we include government reports as well as papers, then I have 42 co-authors, of whom I have met 17. I find it interesting that this ratio is so similar between the two types of reporting (about 40%). So I was wondering: for those of you who read this blog and publish, is your ratio about the same?