In the poverty-stricken neighborhood where the Gruener family lived, tuberculosis was a well-established part of life. But in the fall of 1918, something new visited their Frankfurt community that remained until 1920. It began as a fever and sore throat. Headaches, body aches, cough and nose bleeds were common. Doctors advised their patients to take up to 30 grams of aspirin per day. For some, this regime appeared to work as their symptoms improved. Days would pass before this mysterious manifestation re...