National Public Radio Airs Segment on Concrete

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National Public Radio's Science Friday feature recently included a segment on author Robert Courland whose book, Concrete Planet, discusses why the concrete first used by the Romans is more durable than the concrete used in most present day buildings. Plus, mineralogist Peter Stemmerman tells us about his invention, Celitement and why it is greener than Portland cement. The broadcast can be accessed via the Science Friday Web site.