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The green owl is not just a mascot. It is a guilt machine. People do their lessons because they do not want to disappoint a cartoon bird. And it works.
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A streak is the most powerful feature we ever built. People will do insane things to avoid breaking a 500-day streak. Loss aversion is a hell of a drug.
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The 26-Week Savings Challenge went viral because saving money should feel like a game, not a chore.