This research investigates whether rationality predicts critical news interpretation beyond general intelligence. Although intelligence measures cognitive ability and abstract reasoning, it does not fully capture rational thinking, which involves evaluating evidence, resisting cognitive biases, recognizing logical fallacies, and overriding intuitive but incorrect responses. The project consists of three complementary studies. The first study adapts and validates a comprehensive psychometric measure of rationality for the Brazilian population. The second examines whether rationality explains unique variance in news evaluation, credibility judgments, fallacy detection, and willingness to share misinformation after controlling for intelligence. The third experimentally tests whether a brief intervention focused on recognizing logical fallacies and evaluating evidence improves critical news interpretation and reduces susceptibility to misinformation. Overall, the project integrates psychometrics, cognitive psychology, and media literacy to clarify the empirical distinction between intelligence and rationality and to develop evidence-based strategies for improving resistance to misinformation in digital environments.