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?
I never sleep yet sometimes I weep. I can get angry or just be happy. Wherever you go, I will follow. No matter what you do, I will be there. I cannot die. What am I?
A single syllable do I claim black was my most famous name; Fetal to mortals here below thousands have I slain in a single blow.
I'm really blue but when you see me I'm red. You don't see me too often. I'm there for you if you're hurt.
My first though water cures no thirst my next alone has soul and when he lives upon my first he then is called my whole.
The answer I give is yes, but what I mean is no. What was the question?