Review of the year: uncovering the science of Covid-19 (part one)

There have been a number of incredible science stories in 2020, from AI deciphering the facial expressions of mice to the discovery of a black hole just 1,000 light-years from Earth. Yet, it was the Sars-CoV-2 virus that came to dominate both the headlines and our lives. In the first of two episodes, health editor Sarah Boseley, science editor Ian Sample and producer Madeleine Finlay give their thoughts on what has happened over the past year, alongside professors Eleanor Riley, John Drury and Christina Pagel.