Answer:
I break down buildings, I crumble mountains but you can't see me. What am I?
I am carried by mad animals.
You cannot keep me until you have given me. What am I?
I have all the knowledge you have. But I am so small that I can fit into your hands. What am I?
I have a neck and no head, two arms but no hands. I'm with you to school, I'm with you to work. What am I?
A cowboy rode into Friday. He stayed in town for three days and rode back on friday. How is that possible?