OAK RIDGE, Tennessee, June 10 -- The U.S. Department of Energy's Oak Ridge National Laboratory issued the following news release: Researchers at the Department of Energy's Oak Ridge National Laboratory and the University of Maine have designed and 3D-printed a single-piece, recyclable natural-material floor panel tested to be strong enough to replace construction materials like steel. The project is part of the Sustainable Materials & Manufacturing Alliance for Renewable Technologies, or SM2ART  more