Answer:
In we go, out we go. All around and in a row. Always, always steady flow. When we'll stop, you'll never known. In we go, out we go.
What flares up and does a lot of good, and when it dies is just a piece of wood?
It is the electronic version of junk mail or a salty meat in a can.
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.
It holds most knowledge that has ever been said. But is not the brain, is not the head. To feathers and their masters, it's both bane and boonΒ One empty, and one full.
Almost everyone needs it, asks for it, gives it. But almost nobody takes it.