Omhoog http://www.uitdaging.net/artikel/wat_je_niet_leert_op_school.html  http://wakeup-world.com/2012/01/23/12-things-you-were-not-taught-in-school-about-creative-thinking/ http://www.psychologytoday.com/blog/creative-thinkering/201112/twelve-things-you-were-not-taught-in-school-about-creative-thinking