> Retrieve the information based on some word I might remember See, your memory is using some words as index to access stored information. And it's indexing it

> Retrieve the information based on some word I might remember See, your memory is using some words as index to access stored information. And it's indexing it asap (well, some re-indexing probably happens when we sleep). Thus, I don't think an efficient digital memory extender can work without active human participation in indexing. Otherwise, it will produce a lot of garbage.