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?
In wealth I abound; in water I stand; as a fencer I'm valued all over the land; at Venice I'm famous; by farmers I'm prized; respected by law yet huntsmen despised; consternation and ruin ensue when I break; And the beasts of the forest advantage won't take.
I have feathers that help me fly; with head and body but I'm not alive. Very skinny and a fixed length how far I go depends on your strength.
I am quick when I'm thin. I am slow when I'm fat. Wind is my worst nightmare. What am I?
Every night I'm told what to do and each morning I do what I'm told. But I still don't escape your scold
I've been argued on my color. Without me you'll die. So many attempts on your life use me so make sure you have many of my White friends.