Which packaging innovation for mathematics textbooks was first introduced in the 1990s and revolutionized how students accessed supplementary content?

The packaging of mathematics textbooks and educational materials has evolved significantly over the decades, incorporating both functional and pedagogical considerations. Modern math textbook packaging often includes digital components, manipulatives, and specialized design elements that enhance learning. How well do you know the innovations in mathematics educational product packaging that have changed how students interact with mathematical concepts?

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CD-ROM pocket inserts with interactive problem sets and visualization tools
QR codes linking to online video tutorials
Augmented reality markers embedded in chapter headers
Tear-out formula cards with NFC chips