China has miniaturised the technology used to make electromagnetic cannons to develop a handheld coil gun, according to state media.The weapon was designed for stealth, non-lethal operations and law enforcement, state broadcaster CCTV reported on Saturday, adding that it could fire between 1,000 and 2,000 projectiles a minute and penetrate wooden boards from dozens of metres away.Its power levels can also be altered, meaning that on lower settings there is less chance it will kill someone and...