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"Another tip came our way from Brian to check out a Wired News story on \"Scrubbing Bubbles Hit the Streets\".  Turns out that nanotechnology can do more then keep your pants stain free - a coating of titanium dioxide on concrete surfaces has the ability to"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.treehugger.com/green-architecture/it-slices-it-dices-pollution-eating-concrete.html>