Who woulda thunk it? Giving WiFi to fidgety students on a bus actually makes them more productive. Nearly three years after an Arkansas school launched a trial that delivered laptops, iPods and wireless internet to a bus, an Arizona school district is discovering the merits of such a system -- though with this one, there stands a good chance for it to go well beyond the "pilot" phase. Students in Vail, Arizona have been able to handle school assignments, engage in research and even update their Facebook status on the lengthy rides to and from school, and the suits responsible for hooking Bus No. 92 up have stated that mischief has all but subsided and the bus has magi