Answer:
Why is it so easy to weigh fish?
What building has the most stories?
I get paid when I drive away my customers. What am I?
Never resting, never still. Moving silently from hill to hill. It does not walk, run or trot. All is cool where it is not. What is it?
Physicists have built devices to move me very fast. My last seven letters can be commonly found in newspapers magazines and journals.
No matter how little or how much you use me, you change me every month.
What am I?
Animal
Difficult
Easy
Food
Funny
Kids
Logic