Answer:
What is it that you must give before you can keep it.
Always old, sometimes new. Never sad, sometimes blue. Never empty, sometimes full. Never pushes, always pulls.
You heard me before, yet you hear me again, then I die. Until you call me again.
Where humans breath liquid?
This is in a realm of true and in a realm false, but you experience me as you turn and toss.
What did the piece of wood say when he saw the screwdriver and screws approaching?
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?