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 what no man ever yet did see, which never was, but always is to be. What am I?
Lighter than feather and softer than silk, yet the strongest man in the world cannot hold me for more than a few minutes. What am I?
I can be heard in a court or carried with you.
I tremble at each breath of air, and yet can heaviest burdens bear. What am I?
When is it bad luck to see a black cat?
What am I?
Animal
Difficult
Easy
Food
Funny
Kids
Logic