Answer:
Although I am still, in families I run. I continue to live on in a living one. As one continues to draw breath, I will not rust. However, when one stops drawing breath, I will become mere dust. What am I?
I have three heads. Cut off one I become stronger. Cut off two I become ten.
I come without being fetched at night hides away as soon as daylight strikes. Although I may look small I am much mightier than what you can imagine.
What has 3 feet but no toes?
One pace to the north. Two paces to the east. Two paces to the south. Two paces to the west. One pace to the north.
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.