It took Ignaz Semmelweis more than twenty years (he died before it happened, actually) to persuade doctors that washing their hands could save the lives of mothers giving birth. He had the data, he had the proof, but that wasn’t enough to change minds.
— When data and decision collide http://sethgodin.typepad.com/seths_blog/2009/11/when-data-and-decisions-collide.html
