Answer:
What force and strength cannot get through, I with my unique teeth can do. What am I?
Lighter than feather and softer than silk, yet the strongest man in the world cannot hold me for more than a few minutes. What am I?
What has four wheels and flies?
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.
I am just two and two. I am hot. I am cold. I am the parent of numbers that cannot be told. I am a gift beyond measure, a matter of course. What am I?
The answer I give is yes, but what I mean is no. What was the question?