Yang Songsen, a worker with Jinan Thermal Power Co., calls his wife when having supper in front of a boiler control system in Jinan, East China's Shandong province, on Nov 26, 2014. It has been half a month since public heating started in Jinan and Yang has been absent from his family dinner ever since as the boilers working 24 hours a day need someone to take care of. [Photo/CFP]