I’m sure most of us remember the movie “Back to the Future part 2”, where Marty McFly is transported 30 years into the future to the year 2015.  You may also recall the, futuristic gadgets that were predicted in the film, including flying cars, hover-boards, self-tying shoes, and holographic advertisements. 
 
I haven’t seen many of these come to pass (although I did recently see something about

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