Today I learned about printing presses

For one of my classes we went on a field trip to the library (on campus) and talked about how they first started making printed books. I got to look at some movable type letters and hold some books that are over 400 years old. Did you know that upper case and lower case letters are called that because the letters were stored in cases, one above the other? Pretty crazy, right? Also did you know that paper used to be made out of old rotten peasants' undies? Well it was made of old rags and rotting was part of the process. I bet there were some undies in there though.