Answer:
This is needed both for courage and hardcover books.
What has four wings but cannot fly and uses the wind but does not know why?
You eat something you neither plant nor plow. It is the son of water, but if water touches it, it dies.
It regulates our daily movements, but it feels no interest in our lives. It directs us when to come and go, but does not care if we pay attention. What is it?
It can cause deflation of tires when dropped from the rear of spy cars.
Dark, feathery, and popular in Baltimore and fantasy books.