There were no tears that day, no meltdowns, no tantrums, no fights. Oddly, though, the teacher, a young, dark-haired woman named Ms. Leonardo, didn’t seem to be going out of her way to maintain order, or even to guide the children’s conduct in any overt fashion. There were no admonitions, no gold stars, no time-outs, no “I like the way Kellianne is paying attention!”—indeed, no rewards for good behavior or punishments for bad at all.