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 a kind of coat that can only be put on when wet.
If you drop me I'm sure to crack. But give me a smile and I'll always smile back.
I'm white and used for cutting and grinding. When I'm damaged, humans usually remove or fill me. For most animals I am a useful tool. What am I?
What can one catch that is not thrown?
What never gets any wetter no matter how hard it rains?
What am I?
Animal
Difficult
Easy
Food
Funny
Kids
Logic