There is actually a very simple explanation as to why we don't have any of these technological advances today. An explanation that is actually given in the movie.
The whole premise of the movie series is when travelling through time, your actions in the past can have ramifications on the future.
In the future, Marty isn't working at his dream job. We actually see Marty get fired from his future self's job. We later find out that Marty's future life isn't what he dreamed it would be, thanks to a car accident Marty got in after being called a chicken. It was in this accident where he hurt his form arm or wrist I believe. It's this injury that impacted Marty's life moving forward.
In the third movie, we get to see the scenario develop which leads to the accident where Marty make his live changing injury, only instead of socuming to the rival racer's chicken taunts. When the light turns green, Marty does not participate in race and we get to see where the accident would've happen had he participated.
Marty avoiding the accident then would've changed his life moving forward. But, as we also learn in the movie series when you change something in the past, it not only changes your future, it also impacts everyone else's future.
So that being said...Marty avoiding the car accident would've changed the future we saw in the second film. And because more than just Marty's life would've been impacted by this, there is a chance that this change could have lead to the individuals who invented the Hover Board or the technology that made cars fly taking different paths in life and never achieving these technological advances.
You want to know why we don't have hover boards today...it's because Marty didn't race.
Now typically my blogs are music related, so for anyone hoping for some music reference....
start 21 October 2015🚩
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