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The newscientist.com article linked at the top of this story says existing paints shield up to 48GHz already. That should work fine for free WiFi (2.4GHz ISM and 5GHz UNII bands), and even most cell phone traffic (900MHz to 3GHz). Why isn't THAT readily available to help mitigate overcrowding of the 3 non-overlapping channels in the 2.4GHz band?