There is no shortage of movies that feature fanciful flying cars: Blade Runner. Harry Potter and the Chamber of Secrets. Back to the Future. And a favorite in our house because we can't resist Bruce Willis, The Fifth Element. In real life, though, flying cars are a vision we haven't realized--yet.

But now it's none other than the BBC declaring flying cars to be the next great advance in a splashy feature last week, reporting on the advances in battery energy density, material science, and computing that have spurred the development of a range of personal flying vehicle prototypes in recent years, from electric gliders to fixed-wing craft and quadcopter drones. Thing is, none of the projects mentioned come even close to living up to the bold headline: "The flying car is here - and it could change the world."

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