Libraries have existed for thousands of years as archives of the earliest forms of writing, these date back to even 2600 BC!
Wow really? I love going to the library
Libraries have so many books! I've heard that some even have millions of them!
Oh really? I've never been to a huge library like that!
Yeah, the one that I've been to, in Houston, isn't really that large either. 
What is the largest library in the United States?
The HIllman Library is actually the biggest in the University of Pittsburgh's center of administration!
Interesting! I'd love to visit there one day.
Yeah, I'm sure they have lots of Berenstein Bears books, which have sold close to 260 million copies since 1962!