Answer:
Until I am measured, I am not known. Yet, how you miss me when I have flown. What Am I?
What can travel around the world while staying in a corner?
I am not alive but I grow I don't have lungs but I need air I don't have a mouth but water kills me. What am I?
I shoot but never kills
Never ahead, ever behind, yet flying swiftly past, for a child, I last forever, for adults, I'm gone too fast.
Give it food and it will live, give it water and it will die.