The year 2015 is nearly behind us-- the year that Doc Brown and Marty McFly visited in Back to the Future Part II. They had flying cars in that version of 2015.
So, when are we going to see the real thing?
At the rate technology was developing in the first half of the 20th century, it seemed like a sure-thing that personal flying vehicles would be available by the second half.
However, just because something is projected, doesn't mean it's going to happen.
One of the biggest problems is power. To get a car to hover in…