Answer:
I am quick when Iām thin. I am slow when Iām fat. Wind is my worst nightmare.
I can swim but never get wet. I can run but never get tired. I follow you everywhere but never say a word.
I am the book one can never finish reading
I am used for light yet I am solid. Without me you would feel enclosed. I hate being touched especially with a lot of force. I like to be in buildings.
What has many teeth but can't bite?
No matter how little or how much you use me, you change me every month.
What am I?
Animal
Difficult
Easy
Food
Funny
Kids
Logic