Home 3d printing getting closer: http://singularityhub.com/2011/10/12/origos-3d-printer-could-be-the-last-toy-your-ten-year-old-will-ever-need/Origo’s 3D Printer Could Be The Last Toy Your Ten Year Old Will Ever Need
By 'Idea' I mean something practical. This might be an improvement or something new but it should be practical. For example: "We should all have jet packs." While a great idea, it's not very practical. If I had an idea on how to improve the thrust/weight ratio, then that would be a practical idea. That being the only real problem that would need to be solved for jet packs.
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