The devastating impact of yellow fever during major historical events is explored, highlighting how it decimated troops and influenced political decisions, including Napoleon's actions regarding Louisiana. The conversation takes a dark turn as the misguided attempts at bio warfare by a Kentucky doctor are revealed, showcasing the lengths some would go to during the Civil War. Additionally, the formation of a dedicated commission to combat yellow fever during the Spanish-American War sheds light on the urgency and challenges faced in understanding this deadly disease.