Answer:
Dies half its life. Lives the rest. Dances without music. Breathes without breath.
By Moon or by Sun, I shall be found. Yet I am undone, if there's no light around.
They try to beat me, they try in vain. And when I win, I end the pain.
Iron roof, glass walls, burns and burns and never falls.
What has 4 eyes but can’t see?
You use it between your head and your toes, the more it works the thinner it grows.
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?