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Definitely! As I said though - RAW states it's what you Know, and makes no mention of what you can recall. Either you know something or you don't. If you know something, but can't recall it, someone can help you, but that's not what the rules say.
Now if we interpret the d20 roll as an indication of the amount of knowledge you can recall then certainly someone can jog your memory. So let's say, I have a knowledge arcana skill of +5. The maximum roll I can get is 25, so this is the sum of the knowledge I have locked away? (perhaps) Under this interpretation when someone aids me to jog my memory (not teach me something new...), then they give me +2. If the target number is 20 and I roll a 14 then that +2 makes it 21 (after my own +5 of course) and that equals success - because of the memory job aid.
Random thought - However, should the maximum I can get be 25(?) Of course this is not now the game works, but it's interesting though..
It's fair to say that, IMO at least, there is no explicitly clear answer about this.
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GMs in my community routinely disallow aiding other on knowledge checks, myself included. I do potentially allow aiding one another on pre-mission legwork knowledge checks though, presuming the PCs have access to a library or such (and the time to sort through said library together... time is sometimes a precluding factor on research being conducted whether individually or cooperatively....)
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Any time we are not in combat, I allow aid another on knowledge unless there is a clear reason why I shouldn't (only one person sees the clue, for example).
Especially for post-briefing checks (nearly every scenario has them, representing things the PCs already know about background points), I've started just having everyone roll, then let the highest check count as the "primary" and everyone else as aid. I see it as everyone sitting around discussing what they know or have heard; too often I've had someone say "I roll 28 to aid" while the previously designated "primary" gets a 13. I have to believe that in a no-pressure conversation, that person with the 28 has more information than just the boost of the main roll to 15.
Identifying creatures in combat is a different story. Each person gets a chance to make a check on their initiative; generally, if a later check is 5 or more higher than a previous one, that person remembers some other useful bit of information beyond what the first person figured out. On the other hand, sometimes a player has a good reason to make their own check - the wizard probably learned more about the creature's SR and SLA's than which metal gets through its DR, which is what the Fighter asked about. In those cases I won't necessarily require a higher result.
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If people roll different results and there are various DC's in the scenario, I give each character a different bit of information as long as they hit a corresponding DC. E.g both the wizard and the fighter identified tjhe K'un-L'un mountain range but only the fighter knows about the Iron Fists(dc 25) and the wizard about the wolves (dc 15).
Now if it is a monster, everyone gets their check and I give them information according to their area of expertise. So barbarians know that Iron Fists have skin as tough as steel(DR/- and a sunder attack) and monks recall them channeling chi to perform various supernatural moves(ki arrow at will) etc.
Sometimes I get judging looks about not giving players the information they wanted, but I do try to start with most iconic and/or dangerous abilities of each opponent. I just kinda hate the leading questions game between players and GM's wherein everyone is keenly aware that "we need to know that hungry fleshes can grow massive RIGHT NOW! THE BARBARIAN IS ALREADY RAGING!" but tries to tiptoe into the info instead of looking like a metagamer. In my mind that growth thing is exactly the kind of info everyone who has a decent chance of being next to a hungry flesh would internalize about them.
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We just came from playing team trivia, which is all about aiding each other on the knowledge checks:
"It's one of these three countries, but I don't know which one..."
"Well, number 2 is on the other coast, so that narrows it down to two..."
"I just heard a story on the news that makes me think it isn't number 1..."
"Number 3 it is, then!"
Now this is over the course of 2 minutes, so clearly not an in-combat situation. I figure that any time you would be able to look through a book, you could ask someone else to look through the same book for you.