Answer:
It is weightless, you can see it. If you put it in a barrel it will make it lighter?
Soldiers line up spaced with pride. Two long rows lined side by side. One sole unit can decide, if the rows will unite or divide.
Held firmly in the hands, like a sword it cuts deep. Bloodless strokes, all, then forward we leap.
What is often returned but is never borrowed?
A home of wood in a wooded place, but built not by hand. High above the earthen ground, it holds its pale blue gems. What is it?
I never sleep yet sometimes I weep. I can get angry or just be happy. Wherever you go, I will follow. No matter what you do, I will be there. I cannot die. What am I?