Technical
wolfram A complete resource for Mathematics.
circuits Electrical Circuits
http://hyperphysics.phy-astr.gsu.edu/hbase/hph.html
Search Engines
Humurous
http://www.world-mysteries.com/sci_17.htm
http://www.project-design.com/playnow1.htm
http://www.douglas.bc.ca/psychd/courses/cool_illusions.htm
