AUSTIN, United States (AFP) — A new idea for combatting America's horrific problem of school shootings is to unleash an unarmed drone to confront the attacker, like a giant buzzing insect. It is the brainchild of a company called Campus Guardian Angel, which has pilot programmes using the technology in Georgia and Florida, with growing interest in Texas. These drones have not yet been battle-tested, however. The approach seems to reflect...