Predicting the future

I read an article in Army Times online today, about Army researchers looking at the possibility of flying Humvees in the near future. That article reminded me of something I saw in the popular cult movie seen all the time on cable TV, "Back to the Future, Part 2", where we see all sorts of car-type vehicles flying around in the year 2016. The movie was made in the mid 1980s I believe, and here we are now in 2010, with no hint of flying cars anywhere. It's always fun to go back and look at predictions made about the future, to see how wrong many of them are.