Large change happens, but is not credible until after the fact. Could you imagine a computer in every howm in 1985, let alone hundreds of them? Gradma using email in 1990? The internet in 1995? Pervasive mobile phones in 2000? The "there is an app for that" phone without a keybaord with millions of apps in 2005? Political manipulation in 2010 with social media? AI in 2015?