How 'Back to the Future Part II' Predicted Today's World and How It Didn't October 21, 2015, is a momentous date in history. Or at least, it is in the annals of movies that envision a world to come. According to the 1989 sci fi comedy "Back to the Future Part II," it's the date on which 1980's teenager Marty McFly (Michael J. Fox), eccentric time travel inventor Dr. Emmett "Doc" Brown" (Christopher Lloyd) and Marty's girlfriend Jennifer Parker (Elisabeth Shue) arrive in what for them is a future version of their California hometown. For us reading this article? That's right now. Smart Homes: The McFly family of 2015 lives in a house where the front door is unlocked by scanning a fingerprint, gadgets are controlled by voice commands, robots help serve meals, and a disembodied synthetic sounding voice reminds anyone going into a room that "it's dangerous to enter without lights nike j guard on." In the real today, smart homes equipped with sensors and automated gadgetry are an emerging trend. Apple, for example, recently unveiled its HomeKit technology, which allows users to do everything from raise their window shades to turn on the tea kettle through the Siri intelligent assistant. British company Moley Robotics has developed a robotic chef that can cook meals, and there's already is an assortment of biometric fingerprint door locks on the market. Flying cars: The movie depicts passenger vehicles zooming through the air at breathtaking speeds between towns, a capability that anyone who's been stuck nike r&d spending in a real life traffic jam would envy. While we don't yet have flying cars, a company called Terrafugia is working to develop such vehicles. One model, the TF X, would be able to cruise aloft nike u of m at speeds of up to 200 miles (321.9 kilometers) per hour, with automated collision avoidance technology that would keep it away from other aircraft and out of airport airspace.