23/10/09: When Sir has but one option At the blokes’ Table O’ Knowledge this morning I chatted with an old schoolmate, Dave, who has been a science teacher under various systems. He has a quick and practical turn of mind, and we compared some classroom adventures. Early in his career Dave served for a spell at Alice Springs where, on a morning, he found himself doing playground duty. To spot trouble, the trick is to look for where there is intentness in the group behaviour. And there, in a far corner of this playground, a group of the town’s working-class…