Well, when we talk about how to write a good hook for a research paper we mostly mean a good introduction to the topic. This could be something like 2-3 sentences or even a few first paragraphs that aim to draw readers attention to your topic in a special, engaging way and lead him/her to the end of your text. In fact, a good hook is what any text requires, whether it is a fiction book or some kind of academic paper. In both of those cases, the beginning strongly defines the attitude of a reader.
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