A (drafting) diagram of the interrelationships between areas of human knowledge. Based on the structure of Wikiversity and inspired by Khan academy and the PLoS article  Clickstream Data Yields High-Resolution Maps of Science (Johan Bollen, Herbert Van de Sompel, Aric Hagberg, Luis Bettencourt,  Ryan Chute, Marko A. Rodriguez, Lyudmila Balakireva. 
https://www.khanacademy.org/exercisedashboard

http://www.plosone.org/article/info:doi/10.1371/journal.pone.0004803#s3
Own work
Brylie Oxley