Harvard and MIT researchers are developing a face mask that lights up when it detects the coronaviru

https://www.businessinsider.com/coronavirus-face-mask-light-up-screening-tool-test-2020-5?fbclid=IwAR2aAq09D87rSQBbDxdheYfERpH8iYOQWgLlW-xxvuRMKzOyFjVCCUPe6JY