Answer:
I go from house to house a messenger small and tight. Whether it rains or snows I sleep outside at night.
What is black when you buy it, red when you use it, and gray when you throw it away?
I don't live within a house, nor do I live without. Most will use me when they come in, and again when they go out. What am I?
What word when read from left to right is a ruler, but when read from right to left is a servant?
I have a head tail but no arms and legs.
Why is the letter B always cool?