They call her Neda, which means 'voice' in Farsi, and her death has become the central rallying cry of the Iranian rebellion. The pretty teenage girl killed by what appears to be a single sniper shot on the streets of Tehran Saturday is now a potent symbol for pro-democracy protesters battering the Islamic regime. Her quick and brutal death in the arms of her howling father was captured on close-up video, posted to Facebook and sent to computer screens across the world. "Neda you broke my heart, too young to die," was one of a flood of messages on Twitter....