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Why a daily question?
Spaced, low-effort repetition beats cramming, a single question a day, kept up over weeks, compounds into real retention the same way the study streak on every tool page does. Miss a day and pick right back up; there's no penalty beyond your own streak count.
Answers and streaks are stored only in your browser (localStorage), no account, no email, no server. Browse all 52 tools for the full calculators behind these questions.