A boy and his dad go out to have fun. They to the park and the boy asked: -Dad, why is grass green? -How can I know. replied the dad Then they went to the beach and the boy asked: -Dad, why is the sky blue? -I don't know son. Then they went into the zoo and the son asked: -Dad, why do animals exist? -Sorry son, I have no clue. Finally they went home and the boy asked: -Dad, am I bothering you with all my questions? -Of course not, if you don't ask question you won't learn anything..