As part of a multi-stop visit to the Knoxville area on Thursday, U.S. Sen. Lamar Alexander got a briefing and look-see at Oak Ridge National Laboratory’s Manufacturing Demonstration Facility — one of the world’s top locations for 3-D Printing. From left are Craig Blue, chief executive officer of the Institute for Advanced Composites Manufacturing Innovation; John Rivard, ORNL legislative fellow; and Alexander. (ORNL photo/Genevieve Martin)