Answer:
It is in every mountain, it's not in any hill, it's not in all the world, and yet it's in the mill.
Before Google, we actually had to physically look things up in this building full of knowledge.
What hangs in the sky by day but at night goes away?
What heavy seven letter word can you take two away from and be left with eight?
Which is the oldest tree?
What is big and yellow and comes in the morning, to brighten mom's day?