Imagine a world political leader taking the stage at a major UN event. The lights come up and everyone quiets down as the speaker prepares to address the crowd. Then, just as he begins, he clutches his chest, doubling over and then falling to the ground, as his artificial pacemaker delivers a fatal shock to his system. While this scenario sounds like a page off a Michel Crichton novel, experts revealed that would-be attackers could do exactly this. Researchers at the security firm Whitescope have exposed critical flaws in one of the leading pacemakers that could allow a terrorist to take control and either prevent or deliver electrical impulses to the device. Threatening to do a live demonstration on an animal, the researchers claim that they could kill a subject by commandeering the device via an iPhone. Time for a wake up call, pacemaker makers.