D1426110744000%260/03D2%26position%3D3%26china_variant%3DFalse&utm_medium=10today.0311&position=3&p art=sl&china_variant=False> theguardian.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 sch