Tim Harford and the More or Less team try to make sense of the statistics which surround us. From BBC Radio 4
http://www.bbc.co.uk/programmes/p02nrss1
The origins of Covid
To find out where a virus comes from, researchers compare it to other viruses to try to trace its origin. This leads to claims like SARS-CoV-2 is 91 or even 96% similar to other known viruses. But what does that really mean? Tim Harford talks to the virus ecologist Marilyn J Roossinck.