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Book ideas that would be brilliant if you could be bothered to write them.
Everyone has a book in them, apparently, so if you had the time, enthusiasm and style to write a full book, what would it be?
Either a (brief) plot outline OR the factual subject you'd tackle.
I would have loved to have written a book about Newton and his early life, but Stevenson has already beaten me to it, so I won't bother :(