It's very rare that we see the emergence of a completely original idea in the world of books. Dame Edna Everage's masterly history of Australian civilization is one such idea, and, possums, you will never think of historical writing in the same way again. 'From our dainty gum nuts and towering Uluru to our world-class sharks and Opera House, marauding possums and poets, taking in game-changing inventions such as the dual-flush toilet and zinc cream,...