Answer:
Neither bought nor sold but more valuable than gold. It is built but not by hand. What is it?
One by one we fall from heaven down into the depths of past, And our world is ever upturned so that yet some time we’ll last.
I am the heart that does not beat. If cut, I bleed without blood. I can fly, but have no wings. I can float, but have no fins. I can sing, but have no mouth.
What can be filled with empty hands?
Come up and let us go. Go down and here we stay.
What covers its face with its hands, speaks no language, yet most known what it's saying?
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?