Answer:
What flies forever, Rests never?
Until I am measured I am not known, Yet how you miss me when I have flown.
Its title means book.
It's got twists and turns, but has no curves. Twist it to fix it, turn it to ruin it. What is it?
Fatherless and motherless. Born without sin, roared when it came into the world. And never spoke again.
The warmer I am the fresher I am.