Carnegie Mellon University: Recycling by Ear: Heinz College Students Use Sound To Sort Plastic and Cut Costs. “A team of students from Carnegie Mellon University’s Heinz College of Information Systems and Public Policy investigated whether recycling facilities could effectively sort plastics by the sounds they make when dropped, as density differs by plastic type…. By the end of the fall […]

https://rbfirehose.com/2026/04/02/recycling-by-ear-heinz-college-students-use-sound-to-sort-plastic-and-cut-costs-carnegie-mellon-university/