Which language learning product packaging innovation first introduced the concept of 'adaptive spaced repetition' prominently on its packaging, revolutionizing how vocabulary retention was marketed?

The packaging of language learning products has evolved significantly over the decades, reflecting both technological advances and changing consumer preferences. From physical dictionaries to digital apps, the way language learning tools are presented to consumers tells an interesting story about how we approach language acquisition. Test your knowledge of innovative language product packaging that revolutionized the industry!

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Rosetta Stone's yellow box software (1992)
Pimsleur's 'Graduated Interval Recall' audio cassettes (1980s)
SuperMemo's floppy disk package (1987)
Oxford University Press's 'Advanced Learner's Dictionary' CD-ROM (1997)