The spread of the novel coronavirus SARS-COV2 is a seismic global event that has pushed healthcare systems and societies into new realities. So, how does a virus become a global pandemic? After all, the world is veiled with viruses and this isn't the first time human history has been altered by one - we need only to recall viruses like the Bubonic plague, Polio, and SARS to see evidence. Humans have a long and complex relationship with viruses. Like most living organisms, viruses co-evolved alongside humans for millions of years. The interaction between viruses and mammals has even permanently altered species' DNA through a process called horizontal gene transfer. Yet, we face this new threat today as a highly-connected global society and economy, and we can learn from these trying times to prevent another occurrence of this scale and potentially save lives. Our guest on this episode is notable wildlife journalist and author David Quammen whose award-winning books have focused prominently on the 'spillover effect' or the jumping of animal diseases into human beings and the impact. Dr. Andrew Weil and Dr. Victoria Maizes speak with Quammen about the events that built-up to this crisis as well as measures individuals can take to reduce the likelihood of another global pandemic, including health choices like diet, lifestyle, and human causes of environmental disruption.