CartesiumAI turns learning into a live, evidence-driven process. Its context-aware 3D companion explains selected concepts, reads the learner’s journal and simulation state, and performs safe real-time demonstrations. Ten deterministic physics labs let learners predict, experiment, collect evidence, revise explanations, and build auditable reports. This can be extended to any other discipline, leading to a high-quality learning experience. Built end to end with Codex and designed for GPT-5.6.