Answer:
Each of these ends in a kettle full of precious metal and the double variety is quite awesome
Always old, sometimes new. Never sad, sometimes blue. Never empty, sometimes full. Never pushes, always pulls.
I cost no money to use, or conscious effort to take part of. And as far as you can see, there is nothing to me. But without me, you are dead.
What building has the most stories?
What has two hands, a round face, always runs, but stays in place?
I can only be played on a windy day
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?