One day last spring, James Wade sat cross-legged on the carpet and called his kindergarten class to order. Lanky and soft-spoken, Wade has a gentle charisma well suited to his role as a teacher of small children: steady, rather than exuberant. When a child performs a requested task, like closing the door after recess, he will often acknowledge the moment by murmuring, “Thank you, sweet pea,” in a mild Texas drawl.