Answer:
I fly yet I have no wings. I cry yet I have no eyes. Darkness follows me. Lower light I never see.
I am easy to waste. I am unstoppable. What am I?
I am needed for most animals and hardcover books. What am I?
I have a lot to say but can't be heard because I can't speak one single word. What am I?
I run up and down the stairs without moving
The answer I give is yes, but what I mean is no. What was the question?