Barrington v John Snow: How best to control Covid-19?

Dr Chris Smith and the Naked Scientist team with science news stories and analysis. Recorded before the new lockdown in England was announced - the team examine the impact of lockdowns, against the argument for using less restrictive measures to manage coronavirus. Also a look at signs that coronavirus immunity is only short-lived, why a dose of vitamin D might be helpful this winter, and why the Moon is wetter than we first thought.