Tracing the history of soap, which has been around since antiquity, from Babylon to modern times.  

Mary Mallon, an asymptomatic carrior of typhoid fever, is what we would call a "super spreader" today. She came to the U.S. from Ireland and worked as a cook, spreading typhoid to the households she worked in. On March 27, 1915, she was quarantined -- involuntarily -- for the rest of her life.