In August of 1918, a horrific second wave of the Spanish Flu crashed across the world. In this episode, the third of a four-part series exploring hydroxychloroquine and COVID-19, I’ll explore this single moment in time, through the mysterious origins of the Spanish Flu and historiographical controversies, scientific missions to mass burial sites in remote Alaskan villages, the ill-fated journey of the HMS Mantua, debates about how to count victims of a pandemic, and the mystery behind Pfeiffer’s bacillu