Answer:
What has no beginning, end, or middle?
I can be heard in a court or carried with you.
I am the ultimate killing machine used not once but TWICE I can be made by humans.
A man who was outside in the rain without an umbrella or hat didn't get a single hair on his head wet. Why?
I hop around and deliver eggs at Easter.
No matter how little or how much you use me, you change me every month.