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Apparently the cheap remotely economical jet pack only works for three minutes per fuel load which is why the military stopped funding the project.
Some guy overseas (I forget where) bought the rights and sells them as novelty things.
I don't need a jetpack (doesn't actually sound very comfortable to me) but wouldn't mind the road controlled automated cars found in various scifi stories (the first that comes to mind is one of the segments in Heinlein's Job). But then I'm also waiting for Heinleins other great invention to come into existence: the moving sidewalks from the short story The Roads Must Roll.
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