Two researchers, each fitted with GPS navigation devices and heart-rate monitors, followed different gatherers on different days.

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Airport monitors counted waiting time by identifying a different passenger each 15 minutes at the very back of the queue, which could be a line formed before passengers split off into separate lines for European passengers, non-European passengers and those prescreened for expedited-entry programs.

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This is different than using wireless transmitters to relay measurements from conventional breathing monitors.

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Traditionally, cathode-ray tubes (CRTs) were somewhat different, depending on whether they were being used for computer monitors or televisions.

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Using so-called reality instant messaging, a software "robot" monitors what you and your friends are doing--watching the same TV shows on different sets, say, or downloading the same song from Eminem--and links all of you via cell phone.

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"There's definitely some truth and validity in these charges...of different standards, " says Peter Chowla, policy officer at the Bretton Woods Project, an NGO that monitors the IMF and the World Bank.

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