Teachers. Good teachers are rare and it's hard to measure teaching talent. Bad teachers are commonplace and unionized to teeth. Sounds like a perfect environme

Teachers. Good teachers are rare and it's hard to measure teaching talent. Bad teachers are commonplace and unionized to teeth. Sounds like a perfect environment for a disruptive AI tech. Like Coursera, but better and fully automated. Or, leaving AI aside, at least another "Uber for X" app, where X = teaching.