The hyperphysics sites indicates that “.... HyperPhysics is an exploration environment for concepts in physics which employs concept maps and other linking strategies to facilitate smooth navigation. ....The entire environment is interconnected with thousands of links, reminiscent of a neural network ….
The rationale for such concept maps is to provide a visual survey of conceptually connected material, and it is hoped that they will provide some answers to the question “where do I go from here?”
What a great job this site is!
http://hyperphysics.phy-astr.gsu.edu/hbase/hph.html#hph
Also check their Hypermath at: http://hyperphysics.phy-astr.gsu.edu/hbase/hmat.html#hmath