Which linguistic principle did Duolingo's CEO Luis von Ahn specifically cite as the foundation for their successful 'streak' feature that dramatically increased user retention?

Duolingo revolutionized language learning through gamification and accessibility. Founded in 2011, the company turned language acquisition into a playful experience with its iconic green owl mascot, Duo. This poll tests your knowledge about how Duolingo's brand strategy specifically leverages linguistic principles to engage users and build its market position. Do you know how the company's linguistics expertise shapes its product and marketing approach?

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Spaced repetition learning theory, which suggests optimal intervals between practice sessions to maximize long-term memory retention
Chomsky's Universal Grammar theory, which proposes humans are biologically predisposed to learn language through pattern recognition
The Sapir-Whorf hypothesis, which suggests language influences thought and perception, leading to their color-coded progress indicators
Krashen's Input Hypothesis, which states language acquisition occurs when learners receive input just beyond their current proficiency level