Comment by stretchwithme

Wouldn't it be cool if all the online ads you see featured topics you want to learn? Repetition is the mother of retention.

Might be worth even if you had to pay a fee for it and take tests to set it up. Or maybe interstitial ads could handle the testing.

Learning would be constant but not require a big time commitment. It's integrated into your leisure activities. Nor would it be easy to set aside.