Answer:
Lighter than what I am made of, more of me is hidden than is seen. What am I?
I run up and down the stairs without moving
Two bodies have I, though both joined in one. The more I stand still the faster I run. What am I?
I have six faces but not even one body connected, 21 eyes in total but cannot see. What am I?
What is it that after you take away the whole some still remains?
A little house full of meat, no door to go in and eat.