heguardian.com / Ian Leslie The video does not seem remarkable on first viewing. A title informs us that we are watching Ashley Hinton, a teacher at Vailsburg Elementary, a school ... read more <http://cdn.flipboard.com/email/assets/smartlink/ws/prod/v19.html?lang=en&utm_campaign=10today&flab_cell_id=2 &flab_experim