my_physics_app/
├── app.py                  # The Streamlit script
├── requirements.txt        # Python dependencies
├── packages.txt            # System dependencies (for Linux/Cloud)
└── topics/                 # Your main content folder
    ├── Topic 1 - ODEs/
    │   ├── ODE.tex
    │   └── ODE_Problem.tex
    ├── Topic 2 - Radioactivity/
    │   ├── Radioactive_Problem.tex
    │   └── Radioactivity_lesson.tex
    └── Topic 3 - Mechanics/
        └── Mechanics_Intro.tex