Modelling foreign language learning in the Duolingo app by fitting a machine learning model! When you have millions of users you can measure recall effectiveness with a high degree of confidence:
miniblog.
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@duolingo should there be a translation visible on a sentence's discussion? Found whilst doing http://t.co/cFmBVS2RaA http://t.co/QcoGZxyVSQ
@duolingo running out of hearts when unlocking a bigtest shortcut redirected me to http://t.co/6Da4ilFOeI which 404s.