Answer:
lighter than feather and softer than silk yet the strongest man in the world cannot hold me for more than a few minutes.
I am the kind of an ant that's good at math. What am I?
Of these things - I have two. One for me - and one for you. And when you ask about the price I simply smile and nod twice.
The more you have me the less you see. Shine a light on me and I shall flee.
What has legs but doesn't walk?
I flow from the Homerβs mouth when he sees doughnuts.