The Secret Genius of Modern Life Series 3 Episodes Available now

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Fridge

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

Air Fryer

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

Rollercoaster

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

Doorbell

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

Motorway

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

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