"Beyond being a triumph of #Science water sanitation led to a fundamental shift in public expectations. Once people saw that clean water was possible, they demanded it.
Twentieth-century water treatment programs transformed public health by virtually eliminating waterborne diseases. Ventilation, filtration and disinfection provide us with the opportunity to dramatically reduce the burden of airborne illnesses..."
https://worksinprogress.co/issue/the-death-rays-that-guard-life/