Higher Tier extras
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15 essential facts
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Five questions at a time. Correct answers earn 10 points. No timer, no lost lives.
Missed facts return after two other answers, or in your next round. Come back tomorrow for a spaced review.
Correct reviews grow further apart: 1, 3, 7, 14, then 30 days. Extra practice is always available. A fact is “getting stronger” after correct reviews on different days.
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