They say necessity is the mother of invention, but I'm not convinced. Throughout this series on inventions, I noticed that almost all of the inventions I covered clustered in the second half of the 19th century, in a time period known as the Second Industrial Revolution. This episode is a retrospective on some of the factors that made that time period see the invention of more society-changing inventions than any other.

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The Mothers of Invention (ep. 15.18)