A dozen or so young men and women, eyes obscured by VR headsets, shuffle around a faux kitchen inside a tech company’s Silicon Valley headquarters. Their arms are bent at the elbows, palms facing down. One pilot stops to pick up a bottle of hot sauce from a counter, hinging at the waist, making sure to keep her hands in view of the camera on her headset at all times. She and her colleagues wear T-shirts emblazoned with the word HUMAN.Meters away, two humanoid robots, with bulbous joints and expr...