Answer:
Lighter than what I am made of, more of me is hidden than is seen. What am I?
I am in the past never in the future. I don't exist but have existed. I saw what you saw and that is what I will ever see.
Break me and I am better, immediately set and harder to be broken again. What am I?
What can travel around the world while staying in a corner?
You can never eat me for breakfast or lunch. What am I?
A little house full of meat, no door to go in and eat.