Answer:
What can go up a chimney down but canβt go down a chimney up?
I fill a room but take no space. What am I?
I am a precious stone, as clear as a diamond. Though you can walk on water with my power, try to keep me, and I'll vanish in an hour. What am I?
There is one in a minute two in a moment and none in a thousand years. What is it?
Glittering points that downward thrust. Sparkling spears that never rust.
No matter how little or how much you use me, you change me every month.