Anti-wi-fi paint offers security
"Researchers say they have created a special kind of paint which can block out wireless signals."
I'm not sure how effective this would be as a security measure, but it apparently also blocks mobile phones, which as the article suggests, would be useful in places like the cinema.
It might also be worthwhile painting the bedroom, so you can use your mobile as an alarm clock without the risk of being woken up by inconsiderate friends and co-workers.
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