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.
I get wet when drying. I get dirty when wiping.
I’m white; perfect for cutting & grinding. For most animals I am a useful tool.
What can travel around the world while staying in a corner?
I jump when I walk and sit when I stand. What am I?
What language does a billboard speak?
What am I?
Animal
Difficult
Easy
Food
Funny
Kids
Logic