Answer:
Until I am measured, I am not known. Yet, how you miss me when I have flown. What Am I?
I walk on 4 legs in the morning, 2 legs at noon, and 3 legs at night. What am I?
I get paid when I drive away my customers. What am I?
What room do ghosts avoid?
I am constantly overlooked by everyone but everyone has me. What am I?
I flow from the Homerβs mouth when he sees doughnuts.