Answer:
If I have it, I don't share it. If I share it, I don't have it. What is it?
What travels from house to house and is sometimes narrow and sometimes wide but always stays outside?
Has no feet, but travels far. Is literate, but not a scholar. Has no mouth, yet clearly speaks.
I am the greatest teacher out of them all, but alas in the end I kill my pupils.
I can run but not walk. Wherever I go, thought follows close behind.
What language does a billboard speak?
Difficult
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?