Far-UVC light to kill the coronavirus

Donald Trump got a lot of stick when he talked about using disinfectant and light to kill off COVID-19 - seemingly implying people should drink bleach or shine a torch down their throats. He was likely referring, though, to research into killing off the coronavirus on surfaces like metal and plastic. And team at Columbia University has indeed discovered a narrow wavelength within UV light that they call 'far-UVC', that, as well as killing viruses on surfaces, is also safe for humans because it can't get through our skin. Eva Higginbotham heard more from David Brenner...