Robotic snakes have been deployed in southwestern China to inspect power lines and ensure a stable power supply during the country’s high-pressure national college entrance exam. The snakelike robots spiral around power lines in Kunming, the provincial capital of Yunnan, to detect hazards such as broken wires, worn components and abnormal temperatures. The device’s developer, the power supply bureau of Kunming’s Guandu district, said the robotic snake had checked more than 130km (81 miles) of...