Aviation companies are promoting electric vertical take-off and landing aircraft (eVTOLs) as the next big thing in urban transportation, but their potential benefits come with considerable risk. — Jules Verne, the 19th-century French science fiction author, famously envisioned in his Master of the World novella a single machine, which he called “the Terror,” that could travel by land, air, and sea, seamlessly combining the functions of cars, airplanes, and submarines. Since then, flying cars have been a fixture…