The world's largest humanoid robot maker is set to go public. Hangzhou-based Unitree Robotics, which last year became the world's largest seller of humanoid robots, filed for an initial public offering (IPO) on the Shanghai Stock Exchange in March, restofworld.org reports. The company hopes to raise 4.2 billion yuan ($610 million) through the IPO, money it will use for research and development, as well as to expand its production capacity. "Unitree's listing will test investors' appetite for