Answer:
What is made of wood, but can't be sawed?
lighter than feather and softer than silk yet the strongest man in the world cannot hold me for more than a few minutes.
I keep things green and keep kids happy during summer time.
I shrink smaller every time I take a bath.
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?
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.