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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 22 tools for the full calculators behind these questions.