New York City, United States of America During the 19th Century: The Largest and Wealthiest City Within the U.S., New York City Acting as the Nexus Between Europe and North America for Centuries, the Living Conditions Within New York City During the 19th Century, the Death Rate of Typhus During the 19th Century, the Average Number of Lice Within a Single Textile During the 19th Century, How Lice Aid the Typhus Pathogen to Infect Human Beings, the Death Rate of New York City During the 19th Century vs the Death Rate of the U.S. During the 19th Century, How U.S. Physician Stephen Smith Located the Owner of the Building His Patients With Typhoid Resided Within, the Reason Smith Was Met With Resistance by New York City Politicians, the Concept of “Night Soil”, the Reason Butchers Converted Rotting Meat Into Sausage During the 19th Century, How Butchers Covertly Hid the Scent of Rotting Meat During the 19th Century, the Benefit of Sodium Borate for Hygiene, How Butchers Improved the Color of Rotting Meat During the 19th Century, the Ingredient Butchers Utilized to Bind Meat Together During the 19th Century, the Number of Restaurants and Food Inspectors Within New York City in 1898, the Reason New York City Developed Food and Drink Regulations, the Person Who Was Imprisoned for Life for Not Washing Their Hands Prior to Preparing Food, the Nickname of Irish Cook “Mary Mallon”, the Reason Mallon Was Apprehended by Law Enforcement, the Person Who Proved That Microorganisms Propagate Disease, the Scientific Discipline Which Ascended From This Scientific Discovery, the Person Who Traced the Typhoid Outbreak of Wealthy Families Within New York City Back to Mallon, Mallon’s Reaction to Being Identified as the Causation of the Typhoid Outbreak Amongst Wealthy Families Within New York City, Mallon Held in Quarantine and the Reason She Was Released Post 3 Years, the Development of Another Typhoid Outbreak Within New York City, the Imprisonment and the Death of Mallon, the First Person to Utilize Photography Within the Slums of New York City, the Career Path of Danish Journalist Jacob Riis, Riis Leveraging Photography to Expose Slum Conditions Within New York City, the Book Riis Published Which Highlighted the Abject Poverty of the Slums of New York City During the 19th Century, the Problem of Poverty Brought to the Attention of the Wealthy and Influential Within New York City During the Late 19th Century, Riis’ How the Other Half Lives: Studies Among the Tenements of New York Publication Becoming a Best Selling Book Within the U.S. During the 19th Century, the Number of Horses Within New York City During the Late 19th Century, the Development of Electric and Gasoline Vehicles Within New York City, the Year the Electric Vehicle Began to Fall Out of Favor With the U.S. Public, the Benefit of Purchasing a Ford Model T Vehicle in Place of Other Vehicles in 1908, the Length of Time Required for Vehicles to Eliminate the Majority of Horses Within New York City, the Concept of “Pinking”, the Person Who Attempted to Resolve the Pinking Problem of Gasoline Engines, How U.S. Mechanical Engineer Thomas Midgley Jr. Resolved the Pinking Problem of Gasoline Engines and How Midgley Jr. Demonstrated the Safety of Leaded Gasoline, the Illness Which Midgley Jr. Developed in 1923, How Lead Functions Within a Gasoline Engine, the Reason Midgley Jr. Began Working Upon the Problem of Refrigeration, the Person Who Created Dichlorodifluoromethane (Freon) and the First Chlorofluorocarbon, and Midgley Jr. Creating 2 of the Most Deadly Environmental Pollutants in History