Discusses how scientists use reasoning and logical thinking to do their work. Explains how Venn diagrams provide a logical way to classify data. Teaches how to recognize valid conclusions by examining if-then statements. Explains how to interpret graphs to explain relationships between different living things, and how changes in environments can be influenced by humans.

Think about it -- Tracking the trail -- Nuggets of knowledge -- Underwater exploration -- Math mentor: follow the clues! -- Math notebook -- Glossary.