Answer:
I always follow my brother but you cannot see me, only him. You cannot hear him but you can hear me. What are we?
All about, but cannot be seen, Can be captured, cannot be held, No throat, but can be heard.
What does a WW1 Trench, A Submarine and a Popular Phone App all have in common?
I am the fountain from which no one can drink. For many I am considered a necessary link. Like gold to all I am sought for, but my continued death brings wealth for all to want more.
I'm a god. I'm a planet. I measure heat.
What do angels sing in the shower?