Turning masks into carbon quantum dots

With cold season here, our disposable mask defense is back. But when we toss it away, its story isn't over. It begins a centuries-long sentence in landfills and oceans. What if we could commute that sentence? Scientists may have found a way, transforming this symbol of waste into a tool for cleanup. Is this the key to breaking a toxic cycle? On the show: Steve, Fei Fei & Yushan