Role-playing game historian Jon Peterson, who wrote Playing at the World and has a blog with the same name, gave an interesting History of D&D in 12 objects. Modelled after Neil MacGregor’s book, A History of the World in 100 Treasures, Peterson tells the story of the people and events who led up to Dungeons and Dragons by telling us the story of twelve obscure objects. It’s 12 minutes and 4 seconds of nerd-a-licious historical viewing, and perfect for celebrating the 40th anniversary of Dungeons and Dragons.