"An alternating current of different frequencies running through you causes a reaction that's noticeably different from anyone else's. Researchers from Dartmouth University are trying to put this difference to use by creating wearable electronics that respond to--and only to--their intended user."
(commentary)
Imagine if this is harnessed minus all the gear. Identifying the populous will be no frills at that point. Big Brother and marketing will have a field day.
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