How do we know that we don't know something?
366980
The more you know, the more you find out that you don't know.
390820
Like your mind or something..\nLike when you think? Make sense?\n\nWhen you do things without thinking you're stupid.\nBut you use that little friend (your mind) to help you. :)
1090706
I don't know.  How can you know?  Look it up.
571028
there is no way of knowing that!
65752
There is no way of knowing. Their is no way of knowing if their is an edge, even if there is an edge it can not be observed.
401065
it is because we don't know the question? unless the question is that if we know it's a confusing question. but do we really know what's the question?
806317
No idea ...please tell ??
187946
It is difficult to guess.
1163277
you never know whether you know or not. But sometimes, you just know.
47525
No one really know it for sure because none of us can prove it true. It's the thing that either you believe it or you don't.
200290
How are we supposed to know that?????
626676
i don't know exzackly
586602
I haven't a clue.... is that right?
116656
How the hell should we know!
1009738
Haven't a clue. Do tell.
271349
I can't remember, but I don't think I have... have I?
55025
Because they don't know anything.