Real gains in educational technology will come from mediating in-person social interactions (focused on knowledge building rather than general purpose interactions, of course).<p>In many instances, the teacher actually knows what should be done to improve the learning of a student - but is logistically constrained from providing that level of service (Bloom&#x27;s 2 sigma problem). The low hanging fruit is removing those constraints.<p>We will need better tools for understanding the knowledge&#x2F;abilities of our students in a much more refined manner.