It turns out that connecting brains with computers is the easy part.Illustration by The Atlantic. Source: Arturo Holmes / Getty.Until recently, in all of human history, the number of true cyborgs stood at about 70. Ian Burkhart has kept a count because he was one of them—a person whose brain has been connected directly to a computer.Burkhart had become quadriplegic in a swimming accident after a wave ran him into a sandbar and injured his spine. He was later able to receive an implant from a res...