What Am I Riddles

Question: What white coat lights up and is hot to the touch?

Question: When people cut me, I do not bleed. They use me, but then they leave. I die, but then revive. I change my appearance as time goes by. What am I?

Question: At first I'm in pieces, but you build me and I carry you, at night when your tired or sleepy or even drunk, what am I?

Question: What's black, white, and red all over?

Question: I travel for miles yet stay where I am. What am I?