Sammies nominee designed way to separate pollutants from emissions, water

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This guest has figured out how to separate things — specifically, he’s developed technologies for separating carbon dioxide out of power plant smokestack emissions. He’s figured out how to separate heavy metals out of water. McMahan Louis Gray is a physical scientist at the Energy Department’s National Energy Technology Laboratory in Pittsburgh, as well as a finalist in this year’s Service to America Medals program. He joined Federal Drive with Tom Temin to discuss his work.