Answer:
What can travel around the world while staying in a corner?
I fly forever Rest never.
I break down buildings, I crumble mountains but you can't see me. What am I?
I shrink smaller every time I take a bath. What am I?
Physicists have built devices to move me very fast. My last seven letters can be commonly found in newspapers magazines and journals.
I always murmur but never talk. Always run but never walk. I have a bed but never sleep, have a mouth but never speak. What am I?