ignorance

http://en.wikipedia.org/wiki/Ignorance

Essays
http://www.123helpme.com/search.asp?text=Ignorance
http://www.ub.edu/histofilosofia/gmayos/PDF/The-ignorance-society[1].pdf

Tube
https://www.youtube.com/results?search_query=Ignorance

Quotes
http://www.brainyquote.com/quotes/keywords/ignorance.html
http://www.goodreads.com/quotes/tag/ignorance

Slides
http://www.slideshare.net/search/slideshow?searchfrom=header&q=Ignorance

History
http://www.trinity.edu/mkearl/histignr.html

Examples
https://mattcbr.wordpress.com/2009/02/05/25-examples-of-ignorance/