Re: If you have children, read this thread
They have been testing http://www.kidspotter.com/ at some theme parks (ex. at Lego Land in Europe). Dunno if its similar (they use WI-FI), but if I had kids, then I would put GPS transmitters on them, and follow them like it was 1984 ;-))
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"Chaos is the law of nature, order is the dream of man."
~Henry B. Adams (Historian) 1838-1918
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