In honour of the silver jubilee of the Association for Learning Technology (ALT), ALT Conference 2018 Co-Chair Martin Weller has been compiling a personal history of the development of Educational Technology (Ed Tech) covering the years 1993 to the present. The final episode, 2018 Critical Ed Tech was published yesterday. Ranging from AI, through the web, eLearning, MOOCs, back to AI and on to blockchain – like Lasers in the 60s, surely a technology looking for an application – it’s an entertaining look at all the disrupting technologies that somehow failed to disrupt education.