Nvidia, Tesla, Hyundai's Boston Dynamics, and Foxconn are all heavily involved in the humanoid robot market.Humanoid robots -- machines powered by artificial intelligence (AI) that physically resemble humans and can emulate human movements and communication -- were not too long ago the sole domain of science fiction. But useful humanoid robots are poised to be produced and available for sale at a significant scale sooner than many people realize.In January, Nvidia (NVDA 2.06%) CEO Jensen Huang said during t ...