Answer:
I have two bodies joined together as one. When standing still I run and run.
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?
My first two letters say my name. My last letter asks a question. What I embrace I destroy.
What can you catch but not throw?
I have all the knowledge you have. But I am so small that I can fit into your hands. What am I?
What do you purposefully put lots of in and on your body, but run away from when you encounter it outside?