Telemetry is the remote collection and measurement of data. It usually involves some sort of wireless broadcast. Of course, remote data collection is important in many fields -- defense, medicine, even agriculture. But it's rarely more exciting than in stock car racing.
A stock car has a computer that collects and broadcasts the car's vital statistics to a central computer [source: NASCAR]. The broadcast uses a wireless radio -- so it's basically a souped-up PDA that automates messages from the driver.
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