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Orbit: Andy Matuschak's new spaced repetition tool
withorbit.com

More or less exactly what I described in my PKG Chapter, although that includes AI and it's not clear that orbit does. "As you read, Orbit occasionally prompts you with quick questions to reinforce the ideas ... after a few days, Orbit will send you an email ... If you still remember an answer, you’ll next see it two weeks later. Then a …

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