A lot of the technologies that we use today were first imagined in Star Trek: cell phones, flash drives, tablets, sliding doors, voice-command for computers. It may seem odd now that these technologies are so ubiquitous, but in fact they once existed only in science fiction. Ethan Siegel thinks yes. “I’ll even challenge you to think of a technology that Star Trek envisioned that we don’t have, and won’t have,” says Siegel. Siegel is a theoretical astrophysicist at the University of Arizona.