Also, in a further iteration, people could upvote and downvote results, or even parts of it, so that it learns what it knows and what it doesn't. If it just say

Also, in a further iteration, people could upvote and downvote results, or even parts of it, so that it learns what it knows and what it doesn't. If it just say "I don't know" for bad results or omit the bad parts, it would already improve things quite a bit. Doing so is quite simple, really.