He definitely remembers putting the keys by the front door when he got home last night. But they’re not there. So where could they be? He presses a button and all of the sudden he can see it clear as day—he never took them out of his jacket pocket, so they must be upstairs.

If work being backed by the US Defense Advanced Research Projects Agency (DARPA) goes according to plan, we one day will be able to implant chips into our brains that will make sure we never forget anything. And although this sounds like science fiction—perhaps a movie starring Keanu Reeves from the 90s—it’s quickly becoming a reality. Scientists have already tested out implants in people suffering from brain injuries to improve their memory, the defense agency announced at a conference in September. MORE