Having used games for decades in teaching sciences and computer science - much of it for fun and to learn what pupils were learning and to learn from pupils - I thought I knew most of it until this book arrived. How wrong can you be. Small wonder the biggest growth industry and potentially the world's greatest earner and influencer is taking off so fast: it offers comfort zones designed by the inhabitant, an extension of childhood's learning places and playmates for life, eternal intellectual adventures that mature with the player, and a sandbox for career training at all levels with only you and your chosen team mates for adjudicator. This I learned from Fun inc. Go read it, you know you need another life or six.