Answer:
What you do to determine the length of something
They are two brothers. However much they run, they do not reach each other.
What sphinxes employ and players enjoy.
What loses its head every morning only to get it back every night?
I look at you, you look at me, I raise my right, you raise your left
Why did Mickey Mouse go to outer space?
Easy
Animal
Difficult
Food
Funny
Kids
Logic
What am I?