Which language learning product was the first to introduce spaced repetition algorithms based on linguistic memory research to optimize vocabulary retention?

In the world of language learning products, innovation and branding go hand-in-hand. Companies often leverage linguistic research to create memorable products that stand out in the marketplace. This poll tests your knowledge about a significant product development in the language learning industry that changed how we approach language acquisition.

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Rosetta Stone (1992)
SuperMemo (1987)
Duolingo (2011)
Pimsleur Method (1967)