Scrubbing with a toothbrush that knows when you missed a spot http://www.engadget.com/2016/02/27/scrubbing-with-a-toothbrush-that-knows-the-spots-youve-miss/
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Scrubbing with a toothbrush that knows when you missed a spot http://www.engadget.com/2016/02/27/scrubbing-with-a-toothbrush-that-knows-the-spots-youve-miss/