XPENG unveiled hyper-realistic IRON humanoid at Tech Day 2025. Viewers refused to believe it was a machine. CEO He Xiaopeng released video exposing mechanical guts. Engineers cut open leg skin live on stage revealing metal joints. Robot walked away normally after incision. IRON has 82 degrees of freedom body-wide. Features human-like artificial spine. Equipped with bionic muscles. Covered in flexible synthetic skin mimicking natural motion. Powered by semiconductor battery. Designed for service sector use. Demonstrates China's rapid AI robotics advances. Crossed uncanny valley threshold effectively. Part of broader Chinese autonomous vehicle and task robot development.