A trick if I decide that a book is not worth my time: I open Wikipedia and read the summary. However once it happened that I changed my mind and continued the

A trick if I decide that a book is not worth my time: I open Wikipedia and read the summary. However once it happened that I changed my mind and continued the book because I found a part of the summary interesting. Usually I take care not to read a lot about a book before starting, because it would be a pity if I learnt about an explanation before figuring it out by myself. So it is a real switch for me, and then I read Wikipedia slowly, ready to stop midsentence if I want to resume the book.