Kno failed because it focused on trying to make education better when most Americans care about getting the same quality educational resources for cheaper (textbooks in this case).<p>If anyone is interested, I wrote this blog post 2+ years ago that expands upon this hypothesis, based on my experience founding and exiting from an online education company: <a href="http://avichal.com/2011/10/07/why-education-startups-do-not-succeed/" rel="nofollow">http://avichal.com/2011/10/07/why-education-startups-do-not-...</a>