
http://www.inquiringmind.com/Archives.html
http://faculty.washington.edu/chudler/neurok.html
Optical illusions lots of information on the web - some links below:-
http://www.ritsumei.ac.jp/~akitaoka/index-e.html
http://www.colorcube.com/illusions/illusion.htm
http://www.questacon.edu.au/html/incredible_illusions.html
http://www.grand-illusions.com/
http://www.torinfo.com/illusion/directory.html
The Color of Your Food Influences How Much You Eat
origami - mathematical units http://www.merrimack.edu/~thull/phzig/phzig.html