In the late 1800s, a mysterious illness swept through rural Michigan, leaving hundreds reeling from severe nausea and "nervous prostration." Families who enjoyed home-made cheese or fresh ice cream suddenly found themselves gripped by a sickness that felt like a localized plague. This dairy-related suffering was known as Tyrotoxism—derived from the Greek for "cheese" and "poison." ⁠ ⁠ Before refrigeration, small dairy factories were often breeding grounds for bacterial decay. One 1884 outbreak affected nearly 300 people, turning community meals into medical emergencies. The culprit was a needle-shaped toxin called tyrotoxicon that formed during fermentation, lurking within the very blocks of cheese that provided these families' livelihoods.⁠ ⁠ The mystery was unraveled by Victor C. Vaughan, who isolated the toxin in 1885, proving it resulted from bacterial decomposition in filthy conditions. His experiments showed that stagnant milk could transform into a chemical weapon, causing cyano...