Answer:
I am needed for most animals and hardcover books. What am I?
What is the word that even in plain sight remains hidden?
I make billions of dollars selling windows. Who am I?
A hundred arms, a thousand fingers, but I have no eyes to see where I linger. What am I?
There was a green house. Inside the green house there was a white house. Inside the white house there was a red house. Inside the red house there were lots of babies. What is it?
What made Cyclops quit teaching?