Mobile devices seem to be infiltrating classrooms at an ever-increasing frequency as the years roll by. First, it was Walkmans (remember those?), then it was mobile phones in the late 90s. From then it progressed to iPods, then to Blackberrys, then to smart phones. The latest iteration of the digital classroom intruder, however, is more cunning and more covert than any of its ancestors (if you ignore Tamagotchis) – it’s the ninja of all learning space (invaders) – the smart watch.