Answer:
I'm white, I'm round, but not always around. Sometimes you see me, sometimes you don't.
A harvest sown and reaped on the same day In an unplowed field, Which increases without growing, Remains whole though it is eaten Within and without, Is useless and yet The staple of nations.
A dragons tooth in a mortals hand, I kill, I maim, I divide the land.
As light as a feather, but you can’t hold it for ten minutes.
Often held but never touched. Always wet but never rusts. Often bits but seldom bit. To use it well you must have wit.
The profession of Jimi Hendrix and Eric Clapton
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?