Answer:
I begin with the letter āiā, if you add āaā in front of me, I become a new word with a different meaning, but still sounds exactly the same. What word am I?
I dig out tiny caves and store gold and silver in them. I also build bridges of silver and make crowns of gold. Sooner or later everybody needs my help yet many people are afraid to let me help them.
I do not contain flesh feather or scales; yet I have fingers and thumbs.
I stand in one place yet I fill a whole room. I can be filled with molten rock and come in every hue.
You bind me and I walk. You loosen me and I stop. What am I?
If I say "everything I tell you is a lie", am I telling you the truth or a lie?