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This has actually been known for quite some time.
For a while, nanomaterials were being viewed as the building materials of the future, but then we found out (or rather, they weren't properly tested) that many of them have carcinogenic and teratogenic properties, so much of the progress in that direction stopped. The silver nanoparticle thing was pretty stupid. They were putting it in socks for a while, until they realized that they really didn't have a good way to get rid of the waste that wasn't environmentally hazardous. Don't look at this article the wrong way..this has been known for quite some time, and nanoparticle/material use was held back from many applications because of the environmental risks. Soil fauna and flora actually have much more to worry about from things like oil spills and mining runoff than nanomaterials pollution.
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