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> all these Jetpack demonstrations of the past decade...

They've been promising those since the 1970s...

Even longer, Thunderball (Bond film featuring the Bell Rocket Belt) was released in 1965.

I wasn’t alive then, so I started being promised it on my children’s books.

They promised we all would be vacationing in Mars by now.

True (the autocorrect stole my 's' of 'decades'...)