"The Common Core standards for English Language Arts call for a significant dose of non-fiction reading, in support of reading comprehension, a finding I’ve discussed before . That requirement has led to some puzzlement (and occasional indignation). Can’t kids gain knowledge of the world from fiction as well? Information about science, history, technology, civics, geography, etc?"
Daniel Willingham gives an interesting "yes and no" answer to this, based on the research.