By Michael Fasano and Robert W. Lund - The 20th century witnessed steady and dramatic extensions of longevity in the United States. At the beginning of the 20th century, U.S. life expectancy was just under 50 years. By the end of the century, it had extended to almost 80 years.
This advance was the result of three fairly discrete developments: - The first part of the 20th century benefitted from basic public health improvements, such as refrigeration, indoor plumbing and…
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