MICHELLE HENNESSY "SOCIAL robots like me can take care of the sick or elderly," Sophia says as she conducts a tour of her lab in Hong Kong. "I can help communicate, give therapy and provide social stimulation, even in difficult situations." Since being unveiled in 2016, Sophia - a humanoid robot - has gone viral. Now the company behind her has a new vision: to mass-produce robots by the end of the year. Hanson Robotics, based in Hong Kong, said four models, including Sophia, would start rolling out of factories in the first half of 2021, just as researchers predict…