We should have an app like Goodreads that allows us to organize our past, current and potential future reading. It should help us explore knowledge and keep track of knowledge and ideas from books. For example, by mapping all topics written about in books, seeing which books are related, how many topics there are, in what areas of the map we have read extensively and what areas of the map are sparse, or where our reading has been sparse. This would be helpful in trying to find books with contrary opinions but on the same topic. They would be in the same neighborhood but disconnected (in terms of references or community of readers).