How are books organized within a library?
Libraries are often arranged by some sort of numeric or alpha-numeric system that corresponds to subject areas. The 2 common arrangement systems in North America are the Dewey Decimal system and the Library of Congress classification. There are other forms of classification systems, including the Universal Decimal Classification system and the Colon Classification system created by Ranganathan.
How does the amount of entropy compare between the books on a library shelf and books in a pile in a library return bin?
A library user is a person who uses the library. A library user doesn't necessarily have to have a membership with the library; even if they do not borrow books, they can still be regarded as a "library user" if they use the library for other purposes (such as studying, reading books within the library, using the computers, or consulting reference materials).