going on display in liverpool. do you want to come and see it, for the first time in 25 years? yeah. it's time, i think. how are you both feeling? it is overwhelming. um, and ifeel quite shaky, to be honest. it's stunning. it has aged well. yeah, i hope we've aged as well as it! a team in cambridge has shown that an off—the—shelf air filter can potentially remove almost all infectious airborne coronavirus from a hospital ward. scientists at the universityjoined with doctors at addenbrooke's hospital to see just how much difference an air filter makes — and their experiment produced dramatic results, that could be used to make hospitals and other public buildings safer. here's our science correspondent richard westcott.