Answer:
Physicists have built devices to move me very fast. My last seven letters can be commonly found in newspapers magazines and journals.
As a state in the USA, I am round on both sides and high in the middle. What am I?
Everyone has me and no one can lose me. What am I?
The more you add the less it weighs. What is it?
I am your most powerful weapon; I come before your eyes. I help you seek the truth, yet I often give you lies. What am I?
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.