How We Got to Now with Steve Johnson: Clean

Series in which innovation expert Steven Johnson reveals the story behind the ideas that made modern life possible. From the ultra-clean environment of a microchip factory to the railway engineer who lifted a city to install sewers, Steven traces the surprising journey from dirty to clean in our lives. He discovers the unsung heroes of this transformation, like the doctor who secretly experimented with a deadly chemical to treat the water supply, and the storekeeper who revolutionised cleanliness in the home. episode 1