If tech experts worry about artificial intelligence, shouldn't you as well? John Naughton

Fifty years ago last Sunday, a computer engineer named Douglas Engelbart gave a live demonstration in San Francisco that changed the computer industry and, indirectly, the world. In the auditorium, several hundred entranced geeks watched as he used something called a "mouse" and a special keypad to manipulate structured documents and showed how people in different physical locations could work collaboratively on shared files, online. It was, said Steven Levy, a tech historian who was present, "the mother of all demos". "As windows open and shut and their contents reshuffled," he wrote, "the audience stared into the maw of cyberspace. Engelbart, with a no-hands mic, talked them through, a calm voice from Mission Control as the truly final frontier whizzed before their eyes."