Advances in sanitation
Humanity has been vulnerable to rapidly spread illnesses because disease propagates more easily in concentrated populations without adequate sanitation.
Advances in sanitation have allowed people to live near one another in cities with less risk to their health, in particular, safe disposal of effluent to spare the water supply from contamination.
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The historical significance of urban centers
The impact of cultural and technological advances
The role of urban centers in shaping society
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