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Two additions from Luca's published essays on note-taking: - 'Knowledge has a purpose' section: notes exist to get things done, not for abstract future use. Without purpose, the system collapses. - Evergreen notes concept: atomic, timeless, reusable units of thought. The most valuable layer of a mature vault. - Organize phase clarified: weekly cadence, deleting >50% of captures is normal and healthy, not a failure.