A New York company called NaturalNano is claiming that it's developed a paint that can block cellphone and WiFi signals - yet be toggled off to allow selective, chargeable access.

If the paint works as promised, then public venues, such as cinemas, libraries and theatres (as well as schools) could become HELLO!-free zones, without the usual cost involved of embedding wiring into walls to shield radio-frequency signals. But, it also means that companies could charge WiFi users to access their own networks and networks that they themselves don't provide.
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And don't forget to tell us let us your thoughts on the pros and cons of cellphone-killing (and selective-WiFi) paint.