The majority of history is captured in written text. So it's not surprising that to learn history requires a fair amount of reading. But reading more doesn't necessarily mean you'll learn more. The key is to extract the most amount of information and knowledge from your history text as possible, as efficiently as possible. History textbooks are made up of words, but not all words are equally important. By discovering the hierarchy of words you can extract up to 75 percent of a textbook's content while only reading 25 percent of the text.