This chapter introduces students to secondary-level science by shifting the focus from simple wonder to a rigorous process of deep exploration. It emphasizes that scientific understanding is built upon simplified models, which deliberately ignore minor details to reveal the core mechanics of complex systems, and a precise language of international standards and mathematical relationships. Key themes include the use of testable predictions to verify theories and the importance of approximate reasoning to build intuition and detect errors in the real world. Ultimately, the source frames science as an open and evolving human activity that requires both the magnifying glass of careful observation and the compass of directed curiosity to navigate the interconnected nature of the modern world.