What does it mean that a new version of SARS-Cov-2 is spreading fast in England and now around the world? How do scientists know this is happening? Viruses can change through evolution by natural selection, just like we can, but a lot faster. Experts talk about how alterations in the virus could change the course of events for us. 

“Follow the Science" is produced, written, and hosted by Faye Flam, with funding by the Society for Professional Journalists. Today’s episode was edited by Seth Gliksman with music by Kyle Imperatore. If you’d like to hear more "Follow the Science," please like, follow, and subscribe!