Harry Veeder wrote:

 RICHLAND, Wash. ­ When Yuri Gorby discovered that a microbe which
 transforms toxic metals can sprout tiny electrically conductive wires
 from its cell membrane, he reasoned this anatomical oddity and its
 metal-changing physiology must be related...

 http://www.pnl.gov/news/release.asp?id=171

Anybody know what this means? :

"/"Shewanella/, of interest in environmental cleanup for its ability
to hasten the weathering of toxic metals into benign ones"

How do you "weather" a toxic metal (like, perhaps, lead, arsenic, mercury...) into a "benign one" (as in a benign metal, like, aluminum, copper, iron, ...?) ?

There's clearly something here that I'm not getting.

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