Answer:
What has two legs but doesn't walk?
It can cause deflation of tires when dropped from the rear of spy cars.
Long and think, red within, with a nail at the end.
What can stand in place of a country but still fold away in a drawer?
My life can be measured in hours. I serve by being devoured. Thin, I am quick. Fat, I am slow. Wind is my foe.
I have two bodies joined together as one. When standing still I run and run.