Answer:
I am two-faced but bear only one. I have no legs but travel widely. Men spill much blood over me. Kings leave their imprint on me. I have greatest power when given away, yet lust for me keeps me locked away.
I fly, yet I have no wings. I cry, yet I have no eyes. Darkness follows me. Lower light I never see.
I am believed to be only one dimensional, and tinier than anything can be, and there are many who say that I am the basis of all that we see. What am I?
What can be heard and caught but never seen?
You must keep this thing. Its loss will affect your brothers. For once yours is lost, it will soon be lost by others.
What has to be broken before you can use it ?
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?