Impossible thing #1: Debian GNU/Linux
With any paradigm shift, it is difficult to see the new world from the old one, even though it is glaringly obvious once you've crossed over. Empirical evidence is one way to bridge the gap. Let's look at some solid evidence for the success of what is probably the most obvious "impossible" achievement of commons-based peer production: free software, as exemplified by the Debian GNU/Linux distribution.