Answer:
I am your most powerful weapon; I come before your eyes. I help you seek the truth, yet I often give you lies. What am I?
What is eaten but can also eat?
I sleep when you are awake, I am awake when you fall asleep. I can fly but no feathers to aid my flight. What am I?
I can make arrows fly. I can make kites soar. What am I?
I have a foot but no leg. What am I?
No matter how little or how much you use me, you change me every month.