MarsGov writes "The Department of Homeland Security is gearing up to be able to periodic test 'alerts' to cable television stations, satellite radio, as well as any text-capable device — PDAs, cell phones, and web sites." From the article: Some glitches remain as telephone companies and other networks grapple with potentially trying to alert all of their customers at the same time without jamming their systems, Lawson said. But the alerts could be transmitted by text messages, audio recordings, video or graphics, he said, opening the possibility of sending out additional detailed information to specific sectors, like hospitals or emergency responders."
All theoretical chemistry is really physics; and all theoretical chemists
-- Richard P. Feynman