Answer:
What is the smallest bridge in the world?
I bind it and it walks. I loose it and it stops.
I am the tool, for inspiring many. Buy me in the store, for not much more than a penny. Don't overuse me, or my usefulness will go.
There are 30 cows and 28 chickens. How many didn't?
What flies around all day but never goes anywhere?
What do angels sing in the shower?
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?