Brevan Jorgenson’s grandma kept her cool when he took her for a nighttime spin in the Honda Civic he’s modified to drive itself on the highway. A homemade device in place of the rear-view mirror can control the brakes, accelerator, and steering, and it uses a camera to identify road markings and other cars. “She wasn’t really flabbergasted—I think because she’s seen so much from technology by now,” says Jorgenson, a senior at the University