“Roads? Where we’re going, we don’t need roads,” says Doc in 1985, as the pair head off into a futuristic 2015. But while Doc and Marty crossed the intervening 30 years almost instantly in their nuclear-powered DeLorean time machine, the rest of us have had to travel through time at a rather more sedate pace. Still, it’s given us a chance to get used to the disappointment that we still need roads because cars still don’t fly. Or run on rubbish. And where are our self-tying shoelaces? But hey, on the bright side, we’re almost there with the hoverboards. 

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