David Quammen is the foremost science writer of our time, specializing in the linked fields of ecology and evolutionary biology. His 2012 book Spillover – exploring how the destruction of natural ecosystems around the world leads to new viruses crossing over from wildlife to human beings – has made him one of the most sought-after and informed voices on the Covid pandemic. Join David and Hal for an engaging, thought-provoking and exquisitely timely conversation.