"He's been called to testify in front of Congress about the potential environmental impact of new laws." - PETER GWIN, The Frozen Zoo, Overheard at National Geographic #OverheardNatGeo #PeterGwin

"And I'm your host, Peter Gwin." - PETER GWIN, How Cicadas Become Flying Saltshakers of Death, Overheard at National Geographic #OverheardNatGeo #PeterGwin

"Happy snacking!" - PETER GWIN, How Cicadas Become Flying Saltshakers of Death, Overheard at National Geographic #OverheardNatGeo #NationalSnackDay #PeterGwin

"So let me just make sure I understand." - PETER GWIN, When Family Secrets (And Soap Operas) Fuel Creativity, Overheard at National Geographic #OverheardNatGeo #PeterGwin

"Think about handwriting on a Post-it® Note!" - PETER GWIN, If These Walls Could Talk, Overheard at National Geographic #OverheardNatGeo #NationalHandwritingDay #PeterGwin

"Oh, my gosh." - PETER GWIN, If These Walls Could Talk, Overheard at National Geographic #OverheardNatGeo #PeterGwin

"I mean, polar bears live in the Arctic, but their survival is threatened by climate change." - PETER GWIN, The Frozen Zoo, Overheard at National Geographic #OverheardNatGeo #InternationalPolarBearDay #PeterGwin

"So there was some evidence that maybe Mount Vesuvius didn't erupt in the summer, but instead, in the fall!" - PETER GWIN, If These Walls Could Talk, Overheard at National Geographic #OverheardNatGeo #FirstDayofAutumn #FallEquinox #PeterGwin

"Turns out there's a lot more going on with cicadas than you thought." - PETER GWIN, How Cicadas Become Flying Saltshakers of Death, Overheard at National Geographic #OverheardNatGeo #PeterGwin

"And this was important because for decades, the last wild northern white rhinos had sort of dwindled down to this small group living in a war zone." - PETER GWIN, The Frozen Zoo, Overheard at National Geographic #OverheardNatGeo #SaveTheRhinoDay #SaveTheRhinocerosDay #PeterGwin