> anything that gamifies passive consumption, e.g. Duolingo I took 4 1/2 years of Spanish in high school and college, and I feel like I've learned more in 60 d

> anything that gamifies passive consumption, e.g. Duolingo I took 4 1/2 years of Spanish in high school and college, and I feel like I've learned more in 60 days on Duolingo.