In this BBC special, Chris van Tulleken, Hannah Fry and Michael Mosley examine the latest research and explore some of the big questions about this virus and the pandemic it has created. It’s been just 133 days since scientists sequenced the genome of the coronavirus. Thousands of research papers have been published and sophisticated models built that have changed millions of lives. But some basic facts about the SARs-CoV-2 virus and the pandemic it’s caused still seem elusive. Drawing on the world’s experts and the latest research, Chris, Hannah and Michael explore what we really know - and what we don’t - about this deadly virus.