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. Now a 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... Like this podcast? Please help us by supporting the Naked Scientists