The document discusses the importance of teaching science in relation to other subjects through correlation. It provides examples of how physical science can be correlated with subjects like physical geography, history, and music. Teaching different subjects in isolation does not help students understand the real-world applications of their knowledge. Through correlation, students can better organize information from multiple subjects and solve practical problems by applying integrated knowledge from different areas. The goal of education should be to prepare students for life by synthesizing knowledge from various subjects, rather than teaching subjects separately.