Content Enhancement Techniques:
https://ideal-group.org/epub-1/
Chapters:
https://ideal-group.org/?p=2510
AD Movies:
https://ideal-group.org/ad-1/
Harry Potter:
https://ideal-group.org/ad-2/
Interactive Simulations:
https://ideal-group.org/phet-1/
Sound Effects:
https://ideal-group.org/sounds-1/