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Ran across a website that has an article on the so called "smart dust". Electronic eavesdropping. In a way it's interesting and yet scary, (time for my tin foil hat?! lol).
The article is rather long, but you can skim read and get the drift of their story.
Since it involves electronics, I thought that it would fit in this forum. If wrong, please move it.
One source states that the "dust" is to collect data such as "light, temperature, magnetic fields, vibrations, etc.".
While the above link proclaims it has dastardly intent. "1984" was a disturbing movie, and that's where that website is going. Which I believe it could, but not quite yet.