Answer:
I have no voice but I can teach you all there is to know. I have spines and hinges but I am not a door. Once I've told you all, I cannot tell you more. What am I?
I am black and white. I have strings I have keys. I make sound without my lips. I make dough with no flour
I get wet when drying. I get dirty when wiping.
I build bridges of silver and crowns of gold. What am I?
I am owned by the poor the rich does not need me. If you eat me you will die!
Runs over fields and woods all day. Under the bed at night sits not alone, With long tongue hanging out, Resting at your feet until we go for a walk