Which rebranding strategy did Duolingo implement in 2019 that linguistics experts praised for better reflecting the science of language acquisition?

The intersection of linguistics and retail has created fascinating brand stories as language technology companies evolve. This trivia explores how one major language learning platform transformed its brand identity to reflect changing market needs and technological capabilities. Test your knowledge of how language product branding adapts to cultural shifts and technological advancement!

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Introduced the owl mascot 'Duo' with emotional states to represent the psychological journey of language learning
Changed their tagline from 'Learn a language for free' to 'Language learning backed by science'
Shifted their color palette from green to blue to evoke cognitive trust signals based on neurolinguistic research
Implemented a phonetic-based logo where the letters visually represent International Phonetic Alphabet symbols