Answer:
In many hall ways you would stand if not with me in hand.
Before Mount Everest was discovered what was the highest mountain on Earth?
I am the tool for inspiring many. Buy me in the store for not much more than a penny. Don't overuse me, or my usefulness will go. What am I?
I am in the past, never in the future. I don't exist, but have existed. I saw what you saw, and this is what I will ever see. What am I?
I am heavy forward but backward I'm not.
What never gets any wetter no matter how hard it rains?