Education is stuck in the 1800s, still built for the classroom and not the individual.
The idea
The one-to-one education the classroom could never give, finally possible at scale. Every student gets a personal AI teacher that knows the course as well as their lecturer does, teaches at their pace, and checks their understanding as they go. Lecturers stop reading slides to fifty faces and start doing what only people can do: answering questions, leading discussion and opening doors.