• Move directly between text, definitions, references, equations, and figures. • Expand difficult material progressively. • Create personal maps from author-defined concepts. • Ask AI about an exact paragraph. • Receive explanations that cite original source elements. • Compare simplified explanations with original wording. • Build study trails across books while preserving provenance. • Revisit one concept across a whole library. • Manipulate 3D models. • Experiment with numerical tables. • Follow instructor-created reading paths. • Build personal concept dictionaries from authoritative source definitions.