Michael Nelson

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This is one of the stranger hummingbird effects of contemporary culture: the germ theory of disease may have reduced infant mortality to a fraction of its nineteenth-century levels, and made surgery and childbirth far safer than it had been in Semmelweis’s day. But it also played a crucial role in inventing the modern advertising business. Today the cleaning business is worth an estimated $80 billion.
How We Got to Now: Six Innovations That Made the Modern World
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