In so many ways, the gadgets seen in Star Trek remind us that the show is science fiction—a fantasy world inspired by the one we live in. And at times, the show can act as a glimpse into the future. The medical tricorder—that all-in-one portable device that can accurately diagnose anything—sits somewhere in the middle of that spectrum. Medical tech has gotten smaller and more accurate, but we’ve yet to design a handheld diagnostic panacea. That could change soon.