Non-fiction challenge to read a Book from every one of the dewey decimal sub-classifications. 100 books total. 

Class 000 – Computer science, information & general works
Class 100 – Philosophy & psychology
Class 200 – Religion
Class 300 – Social sciences
Class 400 – Language
Class 500 - Science
Class 600 - Technology
Class 700 - Arts
Class 800 - Literature, Rhetoric & Criticism
Class 900 - History