Which language learning company pioneered the use of 'spaced repetition algorithms' in their product development, becoming the first major brand to incorporate this cognitive science approach?

In the world of language learning and linguistics, product development often involves extensive research and innovative approaches. This poll tests your knowledge about a groundbreaking linguistic product that revolutionized language learning methodology. Think about how technology and linguistic research have merged to create new learning paradigms in recent years.

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Duolingo
Rosetta Stone
Anki/SuperMemo
Babbel