A reader of the PT blog let me know that there is a new version of the “Did You Know” video. It really summarizes the convergence of media technologies in a powerful way. I included Version 3 at the end of my last post because it is a wake-up call about the impact of population changes that underscore the need for education as well as the social impact of technological change. (And the music is better.) Version 4 takes a different tone but is equally impressive.