I don't know !

I think in today's world, one of the biggest problem is people NOT saying - i don't know.

People cannot say - i don't know. It invites more issues.

People hesitate to say - i don't know. It makes things complicated.

People do not know that - they don't know. It cannot solve a problem.

Keeping it simple and saying i don't know, straight and open is in fact a better way to do many things!