Duolingo is fun but the science behind it is serious. Learn about how we personalize your lessons in our new post! https://t.co/PGpanu6zEQ http://pic.twitter.com/EjnLMRlRjX
— Duolingo (@duolingo) December 14, 2016
from Twitter https://twitter.com/SalContesJr
December 15, 2016 at 07:24PM
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