Answer:
Pregnant every time you see her, yet she never will give birth.
Of these things - I have two. One for me - and one for you. And when you ask about the price, I simply smile and nod twice.
My life can be measured in hours. I serve by being devoured. Thin, I am quick. Fat, I am slow. Wind is my foe.
I am a box that holds keys without locks, yet they can unlock your soul.
Turns us on our backs, and open up our stomachs. You will be the wisest of men though at start a lummox.
What language does a billboard speak?
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?