Which language learning subscription model pioneered the 'adaptive spaced repetition' algorithm in 1993, revolutionizing how vocabulary retention was marketed to consumers?

Language learning products have undergone fascinating transformations over the decades. From physical dictionaries to AI-powered translation apps, the way we package and sell language learning tools reflects changing consumer needs and technological capabilities. This poll tests your knowledge about a pivotal moment in language learning product history that changed how we approach linguistic education in retail environments.

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Pimsleur's Audio Monthly
SuperMemo
Rosetta Stone's Quarterly Language Box
Linguaphone's Language Passport