Conductive paint blocks cell phones.

[Bill Hirst]

Tired of hearing other folks' ringtones and converstions in places that are supposed to be quiet, like movie theaters, libraries and churches? NaturalNano has figured a way to put copper particles into nanotubes, which are then mixed into paint. Since it's a passive shield, it seems to be legal, unlike some of the powered phone jammers.

Of course, the cell phone companies don't like it one bit.

http://www.chicagotribune.com/techno...l=chi-news-hed