Answer:
What is lighter than what it is made of?
Who makes it, has no need of it. Who buys it, has no use for it. Who uses it can neither see nor feel it. What is it?
My life can be measured in hours, I serve by being devoured. Thin, I am quick. Fat, I am slow. Wind is my foe.
What points the way without a hand. It floats on water but exists on land?
My teeth are sharp, my back is straight, to cut things up it is my fate.
What do angels sing in the shower?
Difficult
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?