Answer:
There is someone, and there is always another, for without the other, there wouldn't be one
What does a WW1 Trench, A Submarine and a Popular Phone App all have in common?
By the way, what never moves, wears shoes, sandals and boots, but has no feet?
Turns us on our backs, and open up our stomachs. You will be the wisest of men though at start a lummox.
I have two hands but cannot clap
I am rarely touched but often held. If you are smart you'll use me well. What am I?