As he screeches around corners at wildly unsafe speeds, one of the designers of the Jidu Robocar 07 calmly talks your correspondent through how the electric vehicle (EV) works. An alluring feature is its entertainment system—on which he is competing in a race-car game (thankfully, the actual car is stationary). Many of the EV’s features are controlled by voice command and there are almost no buttons or knobs. It has autonomous-driving…