Answer:
It's got twists and turns, but has no curves. Twist it to fix it, turn it to ruin it. What is it?
You use it between your head and your toes, the more it works the thinner it grows.
I have legs but never walk, I may have flowers but no soil, I hold food but never eat.
What building has the most stories?
I am the yellow hem of the sea's blue skirt.
I am owned by Old McDonald.