Lion Kimbro's notebook experiment
Possibly of interest:
'I'm astonished by all the notekeeping programs that think you should categorize notes into one bin or another bin. "No!" Multiple-categorization. If you have a computer, you're not constrained to the physical filing system, where a paper can be in only one place at a time. You can store one piece of paper in 20 places, then. It can belong to 20 category trees. In fact, you can use category graphs- you don't need category trees.'
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