Answer:
Until I am measured, I am not known. Yet, how you miss me when I have flown. What Am I?
Fatherless and Motherless, born without sin. Roared when it entered the world, And never spoke again.
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. What am I?
My seas have no water, my mountains have no rock, and my land has no grass. What am I?
I tell people to be careful when handling boxes.
No matter how little or how much you use me, you change me every month.