The Secret Genius of Modern LifeSeries 3Episodes Episode guide

Back up to: The Secret Genius of Modern Life

1. Motorway

   5/5Hannah drives to the National Highways control centre for the UK’s busiest motorway.
2. Doorbell

   4/5Hannah heads to Los Angeles to take a deep dive into doorbell history.
3. Rollercoaster

   3/5Hannah Fry uncovers the wild origins of the modern-day rollercoaster.
4. Fridge

   2/5Hannah hits the production line to find the lifeblood at the heart of every fridge.
5. Air Fryer

   1/5Hannah looks at the air fryer – a device that is rapidly taking over people's kitchens.