Milk sickness afflicts individuals who ingest dairy products or meat from a cow that has fed on white snakeroot, a plant with a poisonous cluster of small white flowers. It is characterized by trembling, vomiting, and severe intestinal pain. Although rare today, such poisoning killed thousands in the early 19th century, including Abraham Lincoln’s mother. A doctor first described it in 1809, but its exact cause remained elusive. According to legend, how was its cause discovered? Discuss