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Reading alone is not enough for learning and retaining new concepts.
A typical textbook has chapters and sections that are too long, overtaxing readers' attention. Many do little to engage students' interest; this problem has been reported both for secondary students and at the college level. Reading alone is cognitively intensive which causes students to focus so much on extracting facts that they don't think about how to apply or link the knowledge to improve retention.
A "read-recite-review" strategy is the more effective strategy for improving recall. This same strategy also improves long-term retention. Spair can help you implement this strategy by providing you with a way to read, recite, and review your PDFs.
Ask why a result matters, or how these sections connect, and get answers grounded in the exact pages. Import a real source, get grounded explanations, and convert them into the practice that makes the material stick. Whether it's a textbook, lecture slides, or a paper for your literature review, your PDF stops being a wall of text and becomes a study workspace you actually move through.