Challenge: Make learning math fun for kids, and motivate them to keep using Duolingo Math. 

Insight: Kids are more motivated to learn Math when there's a reward associated with it. Duolingo learners who reach a streak of just 7 days are 3.6 times more likely to complete their course.

Solution: Introduce a more tangible reward, a McFlurry, for kids who reach a 7-day streak on Duolingo Math in collaboration with McDonald's