In his book Concrete Planet, author Robert Courland 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.
FBI agents believe they have a credible lead on the whereabouts of Jimmy Hoffa's body. If they're right, it will solve a longstanding mystery, which will also deflate Hoffa's resonance in popular culture.
There was a time — a time long, long ago — when MySpace dominated the teen social-media world. Not anymore. NPR's Sami Yenigun looks at how teenagers use various social platforms in today's increasingly segmented online universe.
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