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I nearly bought a book because it's on a subject that I find really interesting. Then, as I was going to buy it, I read in more detail what it's about, and I didn't buy it. It covers too many topics, which means that it's going to be superficial. It's going to be a kind of survey with no in-depth analysis. 

Initially I was quite interested in it, but then as I continued reading and more topics were added that were kind of like extensions of the central topic, I lost interest.