Answer:
The shorter I am the bigger I am.
Man walks over, man walks under, in times of war he burns asunder. What is it?
I can bring tears to your eyes, resurrect the dead, make you smile, and reverse time. I form in an instant, but I last a lifetime. What am I?
When you buy me I am costly, but the only use I have is hanging only. What am I?
It is greater than God more evil than the devil. The poor have it the rich need it. If you eat it you will die. What is it?
No matter how little or how much you use me, you change me every month.