People think, 'Oh, well how can 'The Hobbit,' which is one book, become three films?' But you can take one line from an appendice and it turns into a whole sequence. ↗
Also, an area that interests me - and it will probably take years to state what I mean - is the period of the rise of democracy, with Tom Paine, which is around the turn of the 18th century into the 19th. ↗