http://www.viralnova.com/invented-by-accident/
http://www.inc.com/tim-donnelly/brilliant-failures/9-inventions-made-by-mistake.html
http://www.todayifoundout.com/index.php/2012/12/10-common-items-that-were-invented-by-accident/
http://www.geniusstuff.com/blog/list/10-accidental-inventions/
http://www.rdasia.com/10-inventions-discovered-by-accident
http://www.csmonitor.com/Innovation/2012/1005/The-20-most-fascinating-accidental-inventions/Ice-Cream-Cones