Answer:
You row in one while you float.
Very helpful if you intend to go gently down a river.
Passed from father to son and shared between brothers, its importance is unquestioned though it is used more by others.
What can travel around the world while staying in a corner?
It keeps you on the ground and stops things from floating around. What is it?
I go in hard come out soft. Blow me hard and I’ll make a pop.