If you plumb the depths of human ingenuity you will resurface with a wet box of penicillin and 100 million bits of different-coloured plastic. We people are very good at making useful things, and then killing ourselves with them. But videogames, my friends. Videogames hold the solution to our self-destructive ways. That tech utopia your pal Start-up Stan is always talking about is in reach, we just need to find a way to make these 12 practical devices from videogames appear in real life.