Answer:
I have all the knowledge you have. But I am so small that I can fit into your hands. What am I?
I am enjoyed by some despised by others. Some take me for granted some treasure me like a gift. I last forever unless you break me first.
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 bought by the yard but worn by the foot. What am I?
Good memory, skin like the sea. A great beast I am, yet vermin frightens me. What am I?
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.