Class 12 tribal boy designs cow safety rope to prevent theft
Rajesh Hansda, a Class 12 tribal boy from Bihar, has designed a safety rope to prevent cattle theft following such incidents in his village. The device, which needs a 12-volt battery to operate, has an insulated wire, a switch and a diode, and lets off an alarm when broken. The model was displayed at an exhibition in IIT-Delhi in 2015.