I will probably get down voted for this, but when did a monopoly that makes you pay ~80 £ (if i remember correctly) for an obligatory book is a good guy now?
Many of the algorithms were are working with them go into the arena of computationally supporting education.
"If you want to understand X, given your personal knowledge graph, you will first need to understand Y."
"The graph is detecting that student A is struggling with X concept."
"Teacher, given the knowledge of your incoming students, you should focus more on Y concept."
"Teacher, no tests needed, here is a ranking of all your students based on their comprehension of the material."
... hopefully the 80£ (and 80 lbs) textbook will be a thing of the past.