I just read an article on a new technology called
radio-frequency identification (RFID) tags.
Basically they are small stamp sized radio transmitters that do not require onboard power. (the receiver provides the power)
Potential uses include allowing frozen dinners to automatically give instructions to microwave ovens, or letting your lost pair of glasses let you know that they've been left under the couch.
See the article at:
http://www.cstorecentral.com/nd/ndStories.asp?i=8&n=1&d=041702
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