0928WarmUp

How do the police, fire and truck drivers communicate with each other? Wifi, Cell?

Do some research and try to find out what is the difference between these technologies?

Check it out @

http://en.wikipedia.org/wiki/Wi-Fi

http://www.howstuffworks.com/wireless-network.htm

http://en.wikipedia.org/wiki/Cellular_network

http://en.wikipedia.org/wiki/Walkie-talkie

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