The US military spends billions of dollars each year beefing up wartime tech, but a low-budget hacked RC car recently served as an unlikely hero, saving six soliders' lives in Afghanistan. The home-built rig, which included a wireless security camera mounted on a Traxxas Stampede remote-controlled truck, cost about $500 when it was built in 2007. Since then, Army Staff Sgt. Christopher Fessenden has used it to locate roadside bombs, until it tripped a detonation sensor during a patrol last month, in turn saving Fessenden and fellow troops from coming head-to-head with 500 pounds of explosives. Unfortuna
