Answer:
I am used when you jump off a bridge for fun.
They come out at night without being called. They are lost in the day without being stolen. What are they?
I go around a yard but do not move. What am I?
What can travel around the world while staying in a corner?
Before Mount Everest was discovered what was the highest mountain on Earth?
No matter how little or how much you use me, you change me every month.