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The Secret Genius of Modern Life Series 3 Episodes

    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 鈥� 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鈥檚 busiest motorway.