Answer:
I stay where I am when I go off. What am I?
I am lighter than air, but a hundred people cannot lift me. Careful, I am fragile. What am I?
When it comes to me, you go on red and stops on green. What am I?
Cold head and feet; round as a ball; always turning around myself.
What building has the most stories?
I'm the source of all emotion but I'm caged in a white prison.