I just started reading this. It’s wonderful. The authors’ aim is to help readers become scientifically literate. They say that scientific literacy is important because it is part of our civic duty: a person cannot participate in discussions about scientific issues in the public square if he does not possess a fundamental background knowledge of science. This fundamental knowledge includes core concepts, facts, and principles. So, all a person needs to do in order to become scientifically literate is to know these concepts, facts and principles.