Answer:
No matter how little or how much you use me, you change me every month. What am I?
It weighs next to nothing but no one can hold it for long. What is it?
I have joy in bringing two together, but darning my existence! My life hangs by a thread, filled with ups, downs and resistance!
There is an ancient invention still used in some parts of the world today that allows people to see through walls. What is it?
They come out at night without being called, and are lost in the day without being stolen. What are they?
I am the fountain from which no one can drink. For many I am considered a necessary link. Like gold to all I am sought for, but my continued death brings wealth for all to want more.