Answer:
I bring light to a dark world. In a current I travel and through tunnels I am hurled. Touch me and I'll kill you. What am I?
You turn me over after you have traveled far. What am I?
I go through a door but never go in, and never come out. What am I?
What gets bigger when more is taken away?
I cannot be felt, seen or touched. Yet I can be found in everybody. My existence is always in debate, yet I have my own style of music. What am I?
I have thirteen hearts but no body or soul. What am I?